Date: Tue, 24 Nov 2009 11:59:21 -0800 From: Jack Vogel <jfvogel@gmail.com> To: pyunyh@gmail.com Cc: "Yuriy A. Korobko" <administrator@shtorm.com>, freebsd-net@freebsd.org Subject: Re: Reducing number of interrupts from intel pro 1000 et adapter Message-ID: <2a41acea0911241159u3b2dab36p66f29724f8cac13@mail.gmail.com> In-Reply-To: <20091124194025.GA1116@michelle.cdnetworks.com> References: <1258998140.3015.34.camel@stormi-desktop> <20091124194025.GA1116@michelle.cdnetworks.com>
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There are significant changes to igb forthcoming, I believe I have fixed the multiqueue problems that exist in it now, and I am working to improve the AIM code so it handles TX and RX (this is still experimental right now though). I hope it addresses your problems. Jack On Tue, Nov 24, 2009 at 11:40 AM, Pyun YongHyeon <pyunyh@gmail.com> wrote: > On Mon, Nov 23, 2009 at 07:42:20PM +0200, Yuriy A. Korobko wrote: > > Hi, > > > > I'd like to know a way to control tx interrupts on intel pro 1000 et > > adapter with igb driver. Just installed one in the router and systat > > shows 8-9k rx interrupts and 20k tx interrupts from igb0 and igb1 > > adapters. Box is a router running freebsd 7.2 release, I've tried > > default driver from kernel source and latest from intel site, effect is > > the same with automatic interrupt moderation enabled and disabled. I > > I'm also aware of this issue. Here is patch I'm currently > experimenting. It seems igb(4) wants to dynamically adjust > interrupt moderation on Rx traffic such that this seems to cause > lots of Tx interrupts under heavy Rx traffic. I simply disabled > that feature and fixed Rx handler not to generate more interrupts. > Without Rx handler fix the igb(4) took all CPU cycles under heady > load(64 bytes UDP torture test) I couldn't even type a character > on console. You can get my patch at the following URL. > http://people.freebsd.org/~yongari/igb/igb.buf.patch5<http://people.freebsd.org/%7Eyongari/igb/igb.buf.patch5>; > > The patch also includes other changes I made so it's somewhat big. > Note, please don't apply the patch on production servers it needs > more testing. > > > have the same box with intel pro 1000 pt adapter which have > > tx(rx)_int_delay sysctls in em driver, I was able to reduce number of > > tx/rx interrupts to 7-8k per interface and got much more cpu idle > > because of less context switches with same pps. > > > > I guess you sacrificed latencies. > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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