interesting(?) data on network interrupt servicing

John Baldwin jhb at freebsd.org
Thu Mar 23 16:11:42 UTC 2006


On Wednesday 22 March 2006 19:32, Paolo Pisati wrote:
> On Wed, Mar 22, 2006 at 03:45:12PM -0500, John Baldwin wrote:
> > This is going out to the I/O APIC and writing a bit to mask the
> > interrupt until the handler has run.  Is he using a kernel that
> > has SMP enabled?  If so, turning SMP off might make things
> > slightly better.
> 
> 7.x:
> SMP is on, PREEMPTION if off

You probably want preemption on to minimize latency.  If this is a
UP machine, you should turn SMP off.  It might be interesting to
compare using 7.x without APIC as well, since you are not using
APIC on 4.x.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org


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