kern/177384: [patch] Updating igb manpage/code with info about num_queues

[hiren panchasara]

>Number:         177384
>Category:       kern
>Synopsis:       [patch] Updating igb manpage/code with info about num_queues
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 25 23:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     hiren panchasara
>Release:        current
>Organization:
>Environment:
10.0-CURRENT FreeBSD 10.0-CURRENT #1 r248555: Wed Mar 20 15:00:20 UTC 2013
>Description:
Updating manpage and source file for igb to specify tunable num_queues.
>How-To-Repeat:

>Fix:
Index: share/man/man4/igb.4
===================================================================
--- share/man/man4/igb.4        (revision 248708)
+++ share/man/man4/igb.4        (working copy)
@@ -31,7 +31,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 12, 2012
+.Dd March 25, 2013
 .Dt IGB 4
 .Os
 .Sh NAME
@@ -160,6 +160,11 @@
 .It Va hw.igb.enable_aim
 If set to 1, enable Adaptive Interrupt Moderation.
 The default is to enable Adaptive Interrupt Moderation.
+.It Va hw.igb.num_queues
+Numer of queues used for data transfer.
+If set to 0, number of queues will be configured
+automatically based on number of CPUs and max
+supported MSI-X messages on the device.
 .It Va kern.ipc.nmbclusters
 The maximum number of mbuf clusters allowed.
 If the system has more than one igb card or jumbo frames are
Index: sys/dev/e1000/if_igb.c
===================================================================
--- sys/dev/e1000/if_igb.c      (revision 248708)
+++ sys/dev/e1000/if_igb.c      (working copy)
@@ -375,7 +375,8 @@
 
 /*
 ** This will autoconfigure based on
-** the number of CPUs if left at 0.
+** the number of CPUs and max supported MSI-X messages
+** if left at 0.
 */
 static int igb_num_queues = 0;
 TUNABLE_INT("hw.igb.num_queues", &igb_num_queues);


>Release-Note:
>Audit-Trail:
>Unformatted: