Author: yongari
Date: Wed Jan 4 00:04:01 2012
New Revision: 229449
URL: http://svn.freebsd.org/changeset/base/229449
Log:
MFC r227349,227513-227514:
r227349:
Document TI_SF_BUF_JUMBO and Xr altq.
r227513:
Document newly introduced a loader tunable and sysctl variables.
r227514:
Clarify hw.ti.%d.dac tunable.
Modified:
stable/7/share/man/man4/ti.4
Directory Properties:
stable/7/share/man/man4/ (props changed)
Modified: stable/7/share/man/man4/ti.4
==============================================================================
--- stable/7/share/man/man4/ti.4 Wed Jan 4 00:03:50 2012
(r229448)
+++ stable/7/share/man/man4/ti.4 Wed Jan 4 00:04:01 2012
(r229449)
@@ -30,7 +30,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd July 16, 2005
+.Dd November 14, 2011
.Dt TI 4
.Os
.Sh NAME
@@ -42,7 +42,7 @@ place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device ti"
-.Cd "options TI_PRIVATE_JUMBOS"
+.Cd "options TI_SF_BUF_JUMBO"
.Cd "options TI_JUMBO_HDRSPLIT"
.Ed
.Pp
@@ -97,13 +97,14 @@ for more discussion on zero copy receive
.Pp
The
.Nm
-driver normally uses jumbo receive buffers allocated by the
+driver uses UMA backed jumbo receive buffers, but can be configured
+to use
.Xr sendfile 2
-buffer allocator, but can be configured to use its own private pool of
-jumbo buffers that are contiguous instead of buffers from the jumbo
-allocator, which are made up of multiple page sized chunks.
-To turn on private jumbos, use the
-.Dv TI_PRIVATE_JUMBOS
+buffer allocator.
+To turn on
+.Xr sendfile 2
+buffer allocator, use the
+.Dv TI_SF_BUF_JUMBO
option.
.Pp
Support for vlans is also available using the
@@ -203,6 +204,93 @@ NEC Gigabit Ethernet
.It
Silicon Graphics PCI Gigabit Ethernet adapter
.El
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width "xxxxxx"
+.It Va hw.ti.%d.dac
+If this tunable is set to 0 it will disable DAC (Dual Address Cycle).
+The default value is 1 which means driver will use full 64bit
+DMA addressing.
+.El
+.Sh SYSCTL VARIABLES
+The following variables are available as both
+.Xr sysctl 8
+variables and
+.Xr loader 8
+tunables.
+The interface has to be brought down and up again before a
+change takes effect when any of the following tunables are
+changed.
+The one microsecond clock tick referenced below is a nominal
+time and the actual hardware may not provide granularity to
+this level.
+For example, on Tigon 2 (revision 6) cards with release 12.0
+the clock granularity is 5 microseconds.
+.Bl -tag -width "xxxxxx"
+.It Va dev.ti.%d.rx_coal_ticks
+This value, receive coalesced ticks, controls the number of clock
+ticks (of 1 microseconds each) that must elapse before the NIC DMAs
+the receive return producer pointer to the Host and generates an
+interrupt.
+This parameter works in conjunction with the rx_max_coal_bds,
+receive max coalesced BDs, tunable parameter.
+The NIC will return the receive return producer pointer to the Host
+when either of the thresholds is exceeded.
+A value of 0 means that this parameter is ignored and receive BDs
+will only be returned when the receive max coalesced BDs value is
+reached.
+The default valus is 170.
+.It Va dev.ti.%d.rx_max_coal_bds
+This value, receive max coalesced BDs, controls the number of
+receive buffer descriptors that will be coalesced before the NIC
+updates the receive return ring producer index.
+If this value is set to 0 it will disable receive buffer descriptor
+coalescing.
+The default valus is 64.
+.It Va dev.ti.%d.ti_tx_coal_ticks
+This value, send coalesced ticks, controls the number of clock
+ticks (of 1 microseconds each) that must elapse before the NIC DMAs
+the send consumer pointer to the Host and generates an interrupt.
+This parameter works in conjunction with the tx_max_coal_bds,
+send max coalesced BDs, tunable parameter.
+The NIC will return the send consumer pointer to the Host when
+either of the thresholds is exceeded.
+A value of 0 means that this parameter is ignored and send BDs will
+only be returned when the send max coalesced BDs value is reached.
+The default value is 2000.
+.It Va dev.ti.%d.tx_max_coal_bds
+This value, send max coalesced BDs, controls the number of send
+buffer descriptors that will be coalesced before the NIC updates
+the send consumer index.
+If this valus is set to 0 it will disable send buffer descriptor
+coalescing.
+The default valus is 32.
+.It Va dev.ti.%d.tx_buf_ratio
+This value controls the ratio of the remaining memory in the NIC
+that should be devoted to transmit buffer vs. receive buffer.
+The lower 7 bits are used to indicate the ratio in 1/64th increments.
+For example, setting this value to 16 will set the transmit buffer
+to 1/4 of the remaining buffer space.
+In no cases will the transmit or receive buffer be reduced below
+68 KB.
+For a 1 MB NIC the approximate total space for data buffers is
+800 KB.
+For a 512 KB NIC that number is 300 KB.
+The default value is 21.
+.It Va dev.ti.%d.stat_ticks
+The value, stat ticks, controls the number of clock ticks
+(of 1 microseconds each) that must elapse before the NIC DMAs
+the statistics block to the Host and generates a STATS_UPDATED
+event.
+If set to zero then statistics are never DMAed to the Host.
+It is recommended that this value be set to a high enough
+frequency to not mislead someone reading statistics refreshes.
+Several times a second is enough.
+The default value is 2000000 (2 seconds).
+.El
.Sh IOCTLS
In addition to the standard
.Xr socket 2
@@ -313,6 +401,7 @@ the network connection (cable).
.El
.Sh SEE ALSO
.Xr sendfile 2 ,
+.Xr altq 4 ,
.Xr arp 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
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