pcb table auto resize (Re: diff: add tuning variables to config(8))
Hi,
On Tue, 17 Jun 2014 12:48:24 +0900 (JST)
YASUOKA Masahiko wrote:
> On Mon, 16 Jun 2014 11:35:07 -0600
> Theo de Raadt wrote:
>>> > Followings are our kernel variables' default:
>>> >
>>> > - sb_max: 256K
>>> > - tcbhash_size: 128
>>> > - udbhash_size: 128
>>> >
>>> > These variables are sometime too small for busy server or gateway.
>>> >
>>> > I'd like to modify config(8) to customize these variables without
>>> > recompiling the kernel.
>>>
>>> If we go this route, I would rather have a generic command (such as "set
>>> ") to change kernel variables.
>>>
>>> The list of said variables would still be restricted to what a given
>>> config(8) knows, to prevent people from tinkering with things they are
>>> not supposed to touch.
>>
>> I quite dislike the direction this is going.
>>
>> It seems like you have found 3 variables which should auto-tune.
>> So why not write kernel code to auto-tune them?
>
> I didn't notice that way, but auto-tune seems better.
>
> I modified in_pcbtable to resize automatically if the number of pcb
> entries beyonds 75% of the hash size. I'm testing this.
I've tested and any problem was not found.
As far as my test, this improved relayd's HTTP connection relay rate
from 5000 conn/sec to 8000 conn/sec on Core2 Duo.
ok?
Resize the pcb hashtable automatically. The table size will be doubled
when the number of the hash entries reaches 75% of the table size.
Index: sys/netinet/in_pcb.c
===
RCS file: /disk/cvs/openbsd/src/sys/netinet/in_pcb.c,v
retrieving revision 1.156
diff -u -p -r1.156 in_pcb.c
--- sys/netinet/in_pcb.c4 Jun 2014 13:45:47 - 1.156
+++ sys/netinet/in_pcb.c27 Jun 2014 09:53:27 -
@@ -118,6 +118,10 @@ struct baddynamicports baddynamicports;
struct pool inpcb_pool;
int inpcb_pool_initialized = 0;
+int in_pcbresize (struct inpcbtable *, int);
+
+#defineINPCBHASH_LOADFACTOR(_x)(((_x) * 3) / 4)
+
#defineINPCBHASH(table, faddr, fport, laddr, lport, rdom) \
&(table)->inpt_hashtbl[(ntohl((faddr)->s_addr) + \
ntohs((fport)) + ntohs((lport)) + (rdom)) & (table->inpt_hash)]
@@ -144,6 +148,7 @@ in_pcbinit(struct inpcbtable *table, int
if (table->inpt_lhashtbl == NULL)
panic("in_pcbinit: hashinit failed for lport");
table->inpt_lastport = 0;
+ table->inpt_count = 0;
}
/*
@@ -191,6 +196,9 @@ in_pcballoc(struct socket *so, struct in
inp->inp_seclevel[SL_IPCOMP] = IPSEC_IPCOMP_LEVEL_DEFAULT;
inp->inp_rtableid = curproc->p_p->ps_rtableid;
s = splnet();
+ if (table->inpt_hash != 0 &&
+ table->inpt_count++ > INPCBHASH_LOADFACTOR(table->inpt_hash))
+ (void)in_pcbresize(table, (table->inpt_hash + 1) * 2);
TAILQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue);
LIST_INSERT_HEAD(INPCBLHASH(table, inp->inp_lport,
inp->inp_rtableid), inp, inp_lhash);
@@ -502,6 +510,7 @@ in_pcbdetach(struct inpcb *inp)
LIST_REMOVE(inp, inp_lhash);
LIST_REMOVE(inp, inp_hash);
TAILQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue);
+ inp->inp_table->inpt_count--;
splx(s);
pool_put(&inpcb_pool, inp);
}
@@ -878,6 +887,39 @@ in_pcbrehash(struct inpcb *inp)
}
#endif /* INET6 */
splx(s);
+}
+
+int
+in_pcbresize(struct inpcbtable *table, int hashsize)
+{
+ u_long nhash, nlhash;
+ void *nhashtbl, *nlhashtbl, *ohashtbl, *olhashtbl;
+ struct inpcb *inp0, *inp1;
+
+ ohashtbl = table->inpt_hashtbl;
+ olhashtbl = table->inpt_lhashtbl;
+
+ nhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nhash);
+ nlhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nlhash);
+ if (nhashtbl == NULL || nlhashtbl == NULL) {
+ if (nhashtbl != NULL)
+ free(nhashtbl, M_PCB);
+ if (nlhashtbl != NULL)
+ free(nlhashtbl, M_PCB);
+ return (ENOBUFS);
+ }
+ table->inpt_hashtbl = nhashtbl;
+ table->inpt_lhashtbl = nlhashtbl;
+ table->inpt_hash = nhash;
+ table->inpt_lhash = nlhash;
+
+ TAILQ_FOREACH_SAFE(inp0, &table->inpt_queue, inp_queue, inp1) {
+ in_pcbrehash(inp0);
+ }
+ free(ohashtbl, M_PCB);
+ free(olhashtbl, M_PCB);
+
+ return (0);
}
#ifdef DIAGNOSTIC
Index: sys/netinet/in_pcb.h
===
RCS file: /disk/cvs/openbsd/src/sys/netinet/in_pcb.h,v
retrieving revision 1.85
diff -u -p -r1.85 in_pcb.h
--- sys/netinet/in_pcb.h18 Apr 2014 10:48:29 - 1.85
+++ sys/netinet/in_pcb.h27 Jun 2014 09:52:26 -
@@ -158,6 +158,7 @@ struct inpcbtable {
LIST_HEAD(inpcbhead, inpcb) *inpt_hashtbl, *inpt_lhashtbl;
u_longinpt_hash, inpt_lhash;
u_int16_t inpt_lastport;
+ int inpt_count;
};
/* f
Re: diff: add tuning variables to config(8)
Hi, On Tue, 17 Jun 2014 09:43:07 +0200 Claudio Jeker wrote: > On Mon, Jun 16, 2014 at 11:35:07AM -0600, Theo de Raadt wrote: >> > > Followings are our kernel variables' default: >> > > >> > > - sb_max: 256K >> > > - tcbhash_size: 128 >> > > - udbhash_size: 128 >> > > >> > > These variables are sometime too small for busy server or gateway. >> > > >> > > I'd like to modify config(8) to customize these variables without >> > > recompiling the kernel. >> > >> > If we go this route, I would rather have a generic command (such as "set >> > ") to change kernel variables. >> > >> > The list of said variables would still be restricted to what a given >> > config(8) knows, to prevent people from tinkering with things they are >> > not supposed to touch. >> >> >> I quite dislike the direction this is going. >> >> It seems like you have found 3 variables which should auto-tune. >> So why not write kernel code to auto-tune them? > > We could replace the hashes with RB trees. I think that would be better > than having to rehash the list. To tune sb_max we need a way to have > memory limits so that the socket buffers don't consume all the resources > and starve the kernel out of memory. I think resizing the hash tables is better than replacing with RB tree. Hash pros: - faster - not so big - easy to understand and customize(eg. adding lock for parallel) cons: - need rehash when growing up --yasuoka
Re: diff: add tuning variables to config(8)
On Mon, Jun 16, 2014 at 11:35:07AM -0600, Theo de Raadt wrote: > > > Followings are our kernel variables' default: > > > > > > - sb_max: 256K > > > - tcbhash_size: 128 > > > - udbhash_size: 128 > > > > > > These variables are sometime too small for busy server or gateway. > > > > > > I'd like to modify config(8) to customize these variables without > > > recompiling the kernel. > > > > If we go this route, I would rather have a generic command (such as "set > > ") to change kernel variables. > > > > The list of said variables would still be restricted to what a given > > config(8) knows, to prevent people from tinkering with things they are > > not supposed to touch. > > > I quite dislike the direction this is going. > > It seems like you have found 3 variables which should auto-tune. > So why not write kernel code to auto-tune them? > We could replace the hashes with RB trees. I think that would be better than having to rehash the list. To tune sb_max we need a way to have memory limits so that the socket buffers don't consume all the resources and starve the kernel out of memory. I think implementing the RB tree is fairly trivial (I did this once 10 years ago) but resource management is a fair bit more work. -- :wq Claudio
Re: diff: add tuning variables to config(8)
On Mon, 16 Jun 2014 11:35:07 -0600
Theo de Raadt wrote:
>> > Followings are our kernel variables' default:
>> >
>> > - sb_max: 256K
>> > - tcbhash_size: 128
>> > - udbhash_size: 128
>> >
>> > These variables are sometime too small for busy server or gateway.
>> >
>> > I'd like to modify config(8) to customize these variables without
>> > recompiling the kernel.
>>
>> If we go this route, I would rather have a generic command (such as "set
>> ") to change kernel variables.
>>
>> The list of said variables would still be restricted to what a given
>> config(8) knows, to prevent people from tinkering with things they are
>> not supposed to touch.
>
> I quite dislike the direction this is going.
>
> It seems like you have found 3 variables which should auto-tune.
> So why not write kernel code to auto-tune them?
I didn't notice that way, but auto-tune seems better.
I modified in_pcbtable to resize automatically if the number of pcb
entries beyonds 75% of the hash size. I'm testing this.
(currently I have no idea for sb_max.)
comments?
Index: sys/netinet/in_pcb.c
===
RCS file: /disk/cvs/openbsd/src/sys/netinet/in_pcb.c,v
retrieving revision 1.156
diff -u -p -r1.156 in_pcb.c
--- sys/netinet/in_pcb.c4 Jun 2014 13:45:47 - 1.156
+++ sys/netinet/in_pcb.c17 Jun 2014 03:36:35 -
@@ -118,6 +118,8 @@ struct baddynamicports baddynamicports;
struct pool inpcb_pool;
int inpcb_pool_initialized = 0;
+int in_pcbresize (struct inpcbtable *, int);
+
#defineINPCBHASH(table, faddr, fport, laddr, lport, rdom) \
&(table)->inpt_hashtbl[(ntohl((faddr)->s_addr) + \
ntohs((fport)) + ntohs((lport)) + (rdom)) & (table->inpt_hash)]
@@ -144,6 +146,7 @@ in_pcbinit(struct inpcbtable *table, int
if (table->inpt_lhashtbl == NULL)
panic("in_pcbinit: hashinit failed for lport");
table->inpt_lastport = 0;
+ table->inpt_count = 0;
}
/*
@@ -191,6 +194,9 @@ in_pcballoc(struct socket *so, struct in
inp->inp_seclevel[SL_IPCOMP] = IPSEC_IPCOMP_LEVEL_DEFAULT;
inp->inp_rtableid = curproc->p_p->ps_rtableid;
s = splnet();
+ if (table->inpt_hash != 0 &&
+ table->inpt_count++ > (table->inpt_hash * 3) / 4)
+ (void)in_pcbresize(table, (table->inpt_hash + 1) * 2);
TAILQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue);
LIST_INSERT_HEAD(INPCBLHASH(table, inp->inp_lport,
inp->inp_rtableid), inp, inp_lhash);
@@ -502,6 +508,7 @@ in_pcbdetach(struct inpcb *inp)
LIST_REMOVE(inp, inp_lhash);
LIST_REMOVE(inp, inp_hash);
TAILQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue);
+ inp->inp_table->inpt_count--;
splx(s);
pool_put(&inpcb_pool, inp);
}
@@ -878,6 +885,38 @@ in_pcbrehash(struct inpcb *inp)
}
#endif /* INET6 */
splx(s);
+}
+
+int
+in_pcbresize(struct inpcbtable *table, int hashsize)
+{
+ u_long nhash, nlhash;
+ void *nhashtbl, *nlhashtbl, *ohashtbl, *olhashtbl;
+ struct inpcb *inp0, *inp1;
+
+ ohashtbl = table->inpt_hashtbl;
+ olhashtbl = table->inpt_lhashtbl;
+ nhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nhash);
+ nlhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nlhash);
+ if (nhashtbl == NULL || nlhashtbl == NULL) {
+ if (nhashtbl != NULL)
+ free(nhashtbl, M_PCB);
+ if (nlhashtbl != NULL)
+ free(nlhashtbl, M_PCB);
+ return (ENOBUFS);
+ }
+ table->inpt_hashtbl = nhashtbl;
+ table->inpt_lhashtbl = nlhashtbl;
+ table->inpt_hash = nhash;
+ table->inpt_lhash = nlhash;
+
+ TAILQ_FOREACH_SAFE(inp0, &table->inpt_queue, inp_queue, inp1) {
+ in_pcbrehash(inp0);
+ }
+ free(ohashtbl, M_PCB);
+ free(olhashtbl, M_PCB);
+
+ return (0);
}
#ifdef DIAGNOSTIC
Index: sys/netinet/in_pcb.h
===
RCS file: /disk/cvs/openbsd/src/sys/netinet/in_pcb.h,v
retrieving revision 1.85
diff -u -p -r1.85 in_pcb.h
--- sys/netinet/in_pcb.h18 Apr 2014 10:48:29 - 1.85
+++ sys/netinet/in_pcb.h17 Jun 2014 03:36:35 -
@@ -158,6 +158,7 @@ struct inpcbtable {
LIST_HEAD(inpcbhead, inpcb) *inpt_hashtbl, *inpt_lhashtbl;
u_longinpt_hash, inpt_lhash;
u_int16_t inpt_lastport;
+ int inpt_count;
};
/* flags in inp_flags: */
Re: diff: add tuning variables to config(8)
> > Followings are our kernel variables' default: > > > > - sb_max: 256K > > - tcbhash_size: 128 > > - udbhash_size: 128 > > > > These variables are sometime too small for busy server or gateway. > > > > I'd like to modify config(8) to customize these variables without > > recompiling the kernel. > > If we go this route, I would rather have a generic command (such as "set > ") to change kernel variables. > > The list of said variables would still be restricted to what a given > config(8) knows, to prevent people from tinkering with things they are > not supposed to touch. I quite dislike the direction this is going. It seems like you have found 3 variables which should auto-tune. So why not write kernel code to auto-tune them?
Re: diff: add tuning variables to config(8)
On Monday, June 16, 2014 18:55 CEST, Miod Vallat wrote: > > Followings are our kernel variables' default: > > > > - sb_max: 256K > > - tcbhash_size: 128 > > - udbhash_size: 128 > > > > These variables are sometime too small for busy server or gateway. > > > > I'd like to modify config(8) to customize these variables without > > recompiling the kernel. > > If we go this route, I would rather have a generic command (such as "set > ") to change kernel variables. > > The list of said variables would still be restricted to what a given > config(8) knows, to prevent people from tinkering with things they are > not supposed to touch. at least for sb_max I once sent a patch to tech@ [1] to change it via sysctl, but that was unfortunately rejected ;) So, I'd still find it easier to change the sysctl than a changing it with config(8). But on the other hand, sysctl might be too easy to use for $average user, and making it only accessible via config(8) may prevent whining users. cheers, Sebastian [1 ] https://groups.google.com/forum/#!topic/mailing.openbsd.tech/kMRT8VO2VaA > > Miod >
Re: diff: add tuning variables to config(8)
> Followings are our kernel variables' default: > > - sb_max: 256K > - tcbhash_size: 128 > - udbhash_size: 128 > > These variables are sometime too small for busy server or gateway. > > I'd like to modify config(8) to customize these variables without > recompiling the kernel. If we go this route, I would rather have a generic command (such as "set ") to change kernel variables. The list of said variables would still be restricted to what a given config(8) knows, to prevent people from tinkering with things they are not supposed to touch. Miod
Re: diff: add tuning variables to config(8)
On Mon, 16 Jun 2014 21:28:55 +0900 (JST)
YASUOKA Masahiko wrote:
> Followings are our kernel variables' default:
>
> - sb_max: 256K
> - tcbhash_size: 128
> - udbhash_size: 128
>
> These variables are sometime too small for busy server or gateway.
>
> I'd like to modify config(8) to customize these variables without
> recompiling the kernel.
>
> Comment or ok?
Let me update the diff. Previous diff has some typos.
Index: usr.sbin/config/cmd.c
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/cmd.c,v
retrieving revision 1.20
diff -u -p -r1.20 cmd.c
--- usr.sbin/config/cmd.c 23 Nov 2013 17:38:15 - 1.20
+++ usr.sbin/config/cmd.c 16 Jun 2014 12:25:59 -
@@ -24,7 +24,7 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#include
+#include
#include
#include
@@ -61,6 +61,11 @@ cmd_table_t cmd_table[] = {
{"bufcachepercent", Xbufcachepct, "[number]",
"Show/change BUFCACHEPERCENT"},
{"nkmempg", Xnkmempg, "[number]", "Show/change NKMEMPAGES"},
+ {"sb_max", Xsb_max, "[number]", "Show/change sb_max"},
+ {"udbhashsize", Xudbhashsize, "[number]",
+"Show/change udbhashsize"},
+ {"tcbhashsize", Xtcbhashsize, "[number]",
+"Show/change tcbhashsize"},
{NULL, NULL,NULL, NULL}
};
@@ -313,5 +318,58 @@ int
Xnkmempg(cmd_t *cmd)
{
int_variable_adjust(cmd, I_NKMEMPG, "nkmempages");
+ return (CMD_CONT);
+}
+
+int
+Xsb_max(cmd_t *cmd)
+{
+ int_variable_adjust(cmd, I_SB_MAX, "sb_max");
+ return (CMD_CONT);
+}
+
+void
+pow2_variable_adjust(const cmd_t *cmd, int idx, const char *name)
+{
+ int i, *v, num;
+
+ if (nl[idx].n_type != 0) {
+ ukc_mod_kernel = 1;
+
+ v = (int *)adjust((caddr_t)(nl[idx].n_value));
+
+ if (strlen(cmd->args) == 0) {
+ printf("%s = %d\n", name, *v);
+ } else {
+ if (number(cmd->args, &num) == 0) {
+if (!powerof2(num)) {
+ for (i = 0; num; num = num >> 1)
+ i++;
+ num = 1 << i;
+ printf("Warning: number must be "
+ "power of 2. Rounded up to %d\n",
+ num);
+ }
+ *v = num;
+ printf("%s = %d\n", name, num);
+ } else
+ printf("Unknown argument\n");
+ }
+ } else
+ printf("This kernel does not support modification of %s.\n",
+ name);
+}
+
+int
+Xudbhashsize(cmd_t *cmd)
+{
+ pow2_variable_adjust(cmd, I_UDBHASHSIZE, "udbhashsize");
+ return (CMD_CONT);
+}
+
+int
+Xtcbhashsize(cmd_t *cmd)
+{
+ pow2_variable_adjust(cmd, I_TCBHASHSIZE, "tcbhashsize");
return (CMD_CONT);
}
Index: usr.sbin/config/cmd.h
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/cmd.h,v
retrieving revision 1.7
diff -u -p -r1.7 cmd.h
--- usr.sbin/config/cmd.h 3 Jun 2003 00:52:35 - 1.7
+++ usr.sbin/config/cmd.h 16 Jun 2014 11:58:37 -
@@ -72,6 +72,9 @@ int Xbufcachepct(cmd_t *);
int Xnkmempg(cmd_t *);
int Xshmseg(cmd_t *);
int Xshmmaxpgs(cmd_t *);
+int Xsb_max(cmd_t *);
+int Xudbhashsize(cmd_t *);
+int Xtcbhashsize(cmd_t *);
#endif /* _CMD_H */
Index: usr.sbin/config/config.8
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/config.8,v
retrieving revision 1.60
diff -u -p -r1.60 config.8
--- usr.sbin/config/config.820 Jan 2014 01:11:49 - 1.60
+++ usr.sbin/config/config.816 Jun 2014 12:41:49 -
@@ -321,6 +321,21 @@ is the number of minutes west of GMT and
.Va dst
is non-zero if Daylight Saving Time is in effect.
Without arguments, displays its current value.
+.It Ic sb_max Op Ar number
+Change the sb_max value.
+Without arguments, displays its current value.
+.It Ic tcbhashsize Op Ar number
+Change the tcbhashsize value.
+Without arguments, displays its current value.
+The
+.Ar number
+should be power of 2, otherwise it will be rounded up forcibly.
+.It Ic udbhashsize Op Ar number
+Change the udbhashsize value.
+Without arguments, displays its current value.
+The
+.Ar number
+should be power of 2, otherwise it will be rounded up forcibly.
.El
.Sh EXAMPLES (kernel building)
Note:
Index: usr.sbin/config/ukc.h
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/ukc.h,v
retrieving revision 1.12
diff -u -p -r1.12 ukc.h
--- usr.sbin/config/ukc.h
diff: add tuning variables to config(8)
Followings are our kernel variables' default:
- sb_max: 256K
- tcbhash_size: 128
- udbhash_size: 128
These variables are sometime too small for busy server or gateway.
I'd like to modify config(8) to customize these variables without
recompiling the kernel.
Comment or ok?
Index: usr.sbin/config/cmd.c
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/cmd.c,v
retrieving revision 1.20
diff -u -p -r1.20 cmd.c
--- usr.sbin/config/cmd.c 23 Nov 2013 17:38:15 - 1.20
+++ usr.sbin/config/cmd.c 16 Jun 2014 12:25:59 -
@@ -24,7 +24,7 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#include
+#include
#include
#include
@@ -61,6 +61,11 @@ cmd_table_t cmd_table[] = {
{"bufcachepercent", Xbufcachepct, "[number]",
"Show/change BUFCACHEPERCENT"},
{"nkmempg", Xnkmempg, "[number]", "Show/change NKMEMPAGES"},
+ {"sb_max", Xsb_max, "[number]", "Show/change sb_max"},
+ {"udbhashsize", Xudbhashsize, "[number]",
+"Show/change udbhashsize"},
+ {"tcbhashsize", Xtcbhashsize, "[number]",
+"Show/change tcbhashsize"},
{NULL, NULL,NULL, NULL}
};
@@ -313,5 +318,58 @@ int
Xnkmempg(cmd_t *cmd)
{
int_variable_adjust(cmd, I_NKMEMPG, "nkmempages");
+ return (CMD_CONT);
+}
+
+int
+Xsb_max(cmd_t *cmd)
+{
+ int_variable_adjust(cmd, I_SB_MAX, "sb_max");
+ return (CMD_CONT);
+}
+
+void
+pow2_variable_adjust(const cmd_t *cmd, int idx, const char *name)
+{
+ int i, *v, num;
+
+ if (nl[idx].n_type != 0) {
+ ukc_mod_kernel = 1;
+
+ v = (int *)adjust((caddr_t)(nl[idx].n_value));
+
+ if (strlen(cmd->args) == 0) {
+ printf("%s = %d\n", name, *v);
+ } else {
+ if (number(cmd->args, &num) == 0) {
+if (!powerof2(num)) {
+ for (i = 0; num; num = num >> 1)
+ i++;
+ num = 1 << i;
+ printf("Warning: number must be "
+ "power of 2. Rounded up to %d\n",
+ num);
+ }
+ *v = num;
+ printf("%s = %d\n", name, num);
+ } else
+ printf("Unknown argument\n");
+ }
+ } else
+ printf("This kernel does not support modification of %s.\n",
+ name);
+}
+
+int
+Xudbhashsize(cmd_t *cmd)
+{
+ pow2_variable_adjust(cmd, I_UDBHASHSIZE, "udbhashsize");
+ return (CMD_CONT);
+}
+
+int
+Xtcbhashsize(cmd_t *cmd)
+{
+ pow2_variable_adjust(cmd, I_TCBHASHSIZE, "tcbhashsize");
return (CMD_CONT);
}
Index: usr.sbin/config/cmd.h
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/cmd.h,v
retrieving revision 1.7
diff -u -p -r1.7 cmd.h
--- usr.sbin/config/cmd.h 3 Jun 2003 00:52:35 - 1.7
+++ usr.sbin/config/cmd.h 16 Jun 2014 11:58:37 -
@@ -72,6 +72,9 @@ int Xbufcachepct(cmd_t *);
int Xnkmempg(cmd_t *);
int Xshmseg(cmd_t *);
int Xshmmaxpgs(cmd_t *);
+int Xsb_max(cmd_t *);
+int Xudbhashsize(cmd_t *);
+int Xtcbhashsize(cmd_t *);
#endif /* _CMD_H */
Index: usr.sbin/config/config.8
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/config.8,v
retrieving revision 1.60
diff -u -p -r1.60 config.8
--- usr.sbin/config/config.820 Jan 2014 01:11:49 - 1.60
+++ usr.sbin/config/config.816 Jun 2014 11:58:37 -
@@ -321,6 +321,21 @@ is the number of minutes west of GMT and
.Va dst
is non-zero if Daylight Saving Time is in effect.
Without arguments, displays its current value.
+.It Ic sb_max Op Ar number
+Change the sb_max value.
+Without arguments, displays its current value.
+.It Ic tcbhashsize Op Ar number
+Change the tcbhashsize value.
+Without arguments, displays its current value.
+The
+.Ar number
+should be power of 2, otherwise it will be rounded up forcibly.
+.It Ic udbhashsize Op Ar number
+Change the tcbhashsize value.
+Without arguments, displays its current value.
+The
+.Ar number
+should be power of 2, otherwise it will be rounded up forcibly.
.El
.Sh EXAMPLES (kernel building)
Note:
Index: usr.sbin/config/ukc.h
===
RCS file: /disk/cvs/openbsd/src/usr.sbin/config/ukc.h,v
retrieving revision 1.12
diff -u -p -r1.12 ukc.h
--- usr.sbin/config/ukc.h 10 Dec 2009 22:07:19 - 1.12
+++ usr.sbin/config/ukc.h 16 Jun 2014 11:58:37 -
@@ -48,7 +48,10 @@
#define I_NMBCLUSTERS 1
