Hi.
Ivan Voras wrote:
> Many people (including me) have run FreeBSD on machines like yours
without such problems, so let's dig further.
You don't have WITNESS, INVARIANTS, DIAGNOSTICS or something similar
enabled? Can you try a generic SMP kernel (called "SMP" in 6.x; the
"GENERIC" in 7.x has SMP by default) and see how it works?
Can you disable SMP and try with only one CPU (on the 2xquad machine)?
You can do it in loader.conf by setting kern.smp.disabled=1, or perhaps
in BIOS. If there's a problem in some hardware or a driver, you'd still
get a big load on sys time. You might also want to halt certain logical
CPUs in the OS itself (see smp(4) man page) and see if there's a certain
relationship between how many CPUs are running and what the sys load is.
Now I'm running yesterday's FreeBSD 7.0-BETA3 amd64 with GENERIC kernel.
I rebuilt kernel and world with clean make.conf. Also I rebuilt Apache,
PHP and eAccelerator from scratch. I tried APC as well. No success.
I tried 7-STABLE with UP kernel (GENERIC built without SMP config
option). It works fine and can handle around 5-10 requests per second.
It consumes %sys time is much less than %user time (see top output in
attach). I.e. it seems to work good as a simple server with not so
powerfull CPU.
After that I rebuilt with SMP GENERIC kernel and put on that server 2
times more requests that UP could handle. For the first time it worked
good. Then I increased load to 2.5 times more than UP. Immediately
Apache child count increased to MaxClients (24), most of them in RUN
state, and %sys became greater than %user (see attach). I think after
some threshold of load FreeBSD is paying more CPU time to the management
of running processes than to run them.
Also I tried to halt CPUs by machdep.hlt_cpus sysctl, but in that case
%sys in top was still much greater than %user.
With best regards,
Alexey Popov
last pid: 1100; load averages: 8.55, 5.20, 2.35 up
0+00:05:39 18:59:52
48 processes: 22 running, 26 sleeping
CPU states: 5.9% user, 0.0% nice, 81.3% system, 0.0% interrupt, 12.8% idle
Mem: 245M Active, 14M Inact, 102M Wired, 108K Cache, 48M Buf, 3543M Free
Swap: 2048M Total, 2048M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
1093 www 1 105 0 94524K 39716K CPU1 7 0:09 34.41% httpd
1094 www 1 105 0 91452K 39732K select 4 0:09 34.01% httpd
1097 www 1 -4 0 98M 48392K RUN 7 0:10 33.41% httpd
1098 www 1 105 0 92476K 43176K CPU4 7 0:09 33.27% httpd
1099 www 1 -4 0 92476K 40784K RUN 7 0:09 33.21% httpd
1100 www 1 -4 0 92476K 41080K RUN 4 0:09 32.87% httpd
1095 www 1 -4 0 92476K 40824K RUN 6 0:09 32.74% httpd
1090 www 1 -4 0 96572K 42700K RUN 5 0:09 32.54% httpd
1089 www 1 -4 0 93504K 42032K RUN 7 0:09 32.41% httpd
1091 www 1 -4 0 95548K 44900K RUN 4 0:09 31.95% httpd
1096 www 1 -4 0 98620K 47160K RUN 6 0:09 31.86% httpd
1086 www 1 -4 0 96572K 45752K RUN 6 0:10 30.92% httpd
1087 www 1 104 0 92476K 41016K CPU7 6 0:09 30.70% httpd
1088 www 1 104 0 92476K 38332K CPU2 6 0:10 30.51% httpd
1085 www 1 105 0 97596K 44416K CPU5 5 0:09 30.23% httpd
1092 www 1 -4 0 92476K 40172K RUN 6 0:08 29.45% httpd
last pid: 2203; load averages: 9.71, 10.08, 7.38 up
0+00:17:48 18:50:39
35 processes: 5 running, 30 sleeping
CPU states: 82.2% user, 0.0% nice, 13.8% system, 0.0% interrupt, 4.0% idle
Mem: 128M Active, 15M Inact, 109M Wired, 132K Cache, 88M Buf, 3657M Free
Swap: 2048M Total, 2048M Free
PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND
2201 www 1 117 0 92476K 40352K RUN 0:02 10.48% httpd
2203 www 1 116 0 96572K 40912K RUN 0:02 10.05% httpd
2195 www 1 117 0 93500K 43012K select 0:02 9.61% httpd
2202 www 1 20 0 91452K 41056K lockf 0:02 8.95% httpd
2194 www 1 117 0 102M 49440K RUN 0:03 8.10% httpd
2192 www 1 114 0 99648K 46168K select 0:03 6.76% httpd
2179 www 1 20 0 92476K 41672K lockf 0:04 6.69% httpd
2173 www 1 118 0 100M 48920K RUN 0:04 5.92% httpd
2174 www 1 20 0 92476K 42964K lockf 0:04 5.67% httpd
878 llp 1 96 0 32928K 4576K select 0:00 0.00% sshd
891 root 1 20 0 9616K 2924K pause 0:00 0.00% csh
691 root 1 96 0 8952K 2528K select 0:00 0.00% ntpd
2161 root 1 131 0 86332K 13080K select 0:00 0.00% httpd
2178 root 1 96 0 7656K 2168K RUN 0:00 0.00% top
875 root 1 4 0 32928K 4512K sbwait 0:00 0.00% sshd
774 root 1 4 0 4852K 1652K kqread 0:00 0.00% master
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