Date: Fri, 10 Feb 2006 13:06:46 -0500 From: Chuck Swiger <cswiger@mac.com> To: Marcos Bedinelli <bedinelli@madhaus.cns.utoronto.ca> Cc: freebsd-net@freebsd.org Subject: Re: Network performance in a dual CPU system Message-ID: <43ECD636.3070403@mac.com> In-Reply-To: <711b7ec873f31bc5be50ce477313fac3@madhaus.cns.utoronto.ca> References: <7bb8f24157080b6aaacb897a99259df9@madhaus.cns.utoronto.ca> <43ECB1E7.8010308@mac.com> <711b7ec873f31bc5be50ce477313fac3@madhaus.cns.utoronto.ca>
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Marcos Bedinelli wrote:
[ ... ]
> mull [~]$vmstat -i
> interrupt total rate
> irq1: atkbd0 3466 0
> irq6: fdc0 10 0
> irq13: npx0 1 0
> irq14: ata0 47 0
> irq21: fxp1 20462527 8
> irq28: bge0 3511765157 1444
> irq29: bge1 3633124373 1494
> irq30: aac0 1842472 0
> cpu0: timer 566751007 233
> Total 7733949060 3181
Interesting, what do you have HZ ("sysctl kern.clockrate") set to? Does setting
it to somewhere around 500, 1000, or 2000 help? You're definitely going to want
to increase HZ if you enable polling mode...
> mull [~]$netstat -m
> 644/646/1290 mbufs in use (current/cache/total)
> 643/407/1050/17088 mbuf clusters in use (current/cache/total/max)
> 0/5/4528 sfbufs in use (current/peak/max)
> 1447K/975K/2422K bytes allocated to network (current/cache/total)
> 0 requests for sfbufs denied
> 0 requests for sfbufs delayed
> 0 requests for I/O initiated by sendfile
> 0 calls to protocol drain routines
You might try increasing the # of kern.ipc.nmbclusters, say by a factor of 2.
This may not help much, seems like you're bottlenecking servicing the bge
interrupts.
I assume you've read "man tuning" and do not have something like WITNESS enabled
in your kernel? :-)
--
-Chuck
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