>Number: 165444
>Category: kern
>Synopsis: [netisr] [patch] incorrect processing of net.isr.bindthreads=0
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Feb 24 11:10:04 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Eugene Grosbein
>Release: FreeBSD 8.2-STABLE i386
>Organization:
RDTC JSC
>Environment:
System: FreeBSD eg.sd.rdtc.ru 8.2-STABLE FreeBSD 8.2-STABLE #37: Wed Feb 15
14:22:03 NOVT 2012 [email protected]:/usr/local/obj/usr/local/src/sys/EG i386
>Description:
I've tried to use loader tunnable 'net.isr.bindthreads=0'
for 4-core router. Sometimes each of 4 NETISR kernel threads get
full cpu mask 0,1,2,3 but sometimes some NETISR threads get bound
to CPU3 only.
See also:
http://lists.freebsd.org/pipermail/freebsd-hackers/2012-January/037597.html
>How-To-Repeat:
See above. The effect is random.
>Fix:
To ensure correct processing of tunnable, small correction is needed,
something like this:
--- sys/net/netisr.c.orig 2012-02-24 17:45:37.000000000 +0700
+++ sys/net/netisr.c 2012-02-24 17:47:52.000000000 +0700
@@ -980,12 +980,10 @@
if (error)
panic("%s: swi_add %d", __func__, error);
pc->pc_netisr = nwsp->nws_intr_event;
- if (netisr_bindthreads) {
- error = intr_event_bind(nwsp->nws_intr_event, cpuid);
+ error = intr_event_bind(nwsp->nws_intr_event,
netisr_bindthreads ? cpuid : NOCPU);
if (error != 0)
printf("%s: cpu %u: intr_event_bind: %d", __func__,
cpuid, error);
- }
NETISR_WLOCK();
nws_array[nws_count] = nwsp->nws_cpu;
nws_count++;
>Release-Note:
>Audit-Trail:
>Unformatted:
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