Date: Mon, 05 Feb 2007 18:53:18 -0800 From: Justin Robertson <justin@sk1llz.net> To: Mike Tancsa <mike@sentex.net>, freebsd-questions@freebsd.org Subject: Re: 6.x, 4.x ipfw/dummynet pf/altq - network performance issues Message-ID: <45C7ED9E.1080109@sk1llz.net> In-Reply-To: <5pkfs2pfv5sjhiiaegg3bae6casglevhpt@4ax.com> References: <45C7A9BD.30403@sk1llz.net> <5pkfs2pfv5sjhiiaegg3bae6casglevhpt@4ax.com>
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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 disabling it. 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 > > kern.polling.enable=1 > net.inet.ip.fastforwarding=1 > kern.polling.idle_poll=1 > kern.random.sys.harvest.ethernet=0 > > and in /boot/loader.conf, add > > kern.hz="2000" > > Also removing > > options ADAPTIVE_GIANT # Giant mutex is adaptive. > > from the kernel helps a bit as well. > > with > kern.polling.idle_poll=1 > > 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 > -------------------------------------------------------- > Mike Tancsa, Sentex communications http://www.sentex.net > Providing Internet Access since 1994 > mike@sentex.net, (http://www.tancsa.com) > >
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