6.x, 4.x ipfw/dummynet pf/altq - network performance issues
justin at sk1llz.net
Tue Feb 6 02:53:27 UTC 2007
I've actually already done everything you've suggested with little or no
impact at all. One point where we have different results is with
ADAPTIVE_GIANT, I actually noticed a drop of about 50kpps thruput when
Mike Tancsa wrote:
> On Mon, 05 Feb 2007 14:03:41 -0800, in sentex.lists.freebsd.questions
> you wrote:
>> I suppose my concerns are two-fold. Why is 6.x collapsing under traffic
>> that 4.11 could easily block and run merrily along with, and is there a
>> queueing mechanism in place that doesn't tie up the box so much on
>> inbound flows that it ignores all other relevant traffic?
>> (as a note, all tests were done with device polling enabled. Without it
>> systems fall over pretty quickly. I also tried tests using 3com cards
>> and had the same results)
> On the 6.x box, try enabling adding to /etc/sysctl.conf
> and in /boot/loader.conf, add
> Also removing
> options ADAPTIVE_GIANT # Giant mutex is adaptive.
> from the kernel helps a bit as well.
> your load avg will be messed up but it should help performance a bit.
> As for firewall rules, things really seem to fall down performance
> wise, as compared to RELENG_4. I havent found a way to improve that
> performance.... However, on the plus side, an extra core does seem to
> help a bit with the box remaining responsive. For NICs, stay with em
> or bge nics for now in RELENG_6
> I have some misc test results at http://www.tancsa.com/blast.html
> Mike Tancsa, Sentex communications http://www.sentex.net
> Providing Internet Access since 1994
> mike at sentex.net, (http://www.tancsa.com)
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