Date: Thu, 27 Jan 2011 13:44:14 -0800 From: Jack Vogel <jfvogel@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Sergey Lobanov <wmn@siberianet.ru>, "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, "freebsd-pf@freebsd.org" <freebsd-pf@freebsd.org> Subject: Re: High interrupt rate on a PF box + performance Message-ID: <AANLkTi=JYFNkXBGdmrt%2B0pq4PJZS=9gG-iV1OMOSkew3@mail.gmail.com> In-Reply-To: <20110127205845.GA41537@icarus.home.lan> References: <4D41417A.20904@my.gd> <1DB50624F8348F48840F2E2CF6040A9D014BEB8833@orsmsx508.amr.corp.intel.com> <4D41B197.6070308@my.gd> <201101280146.57028.wmn@siberianet.ru> <4D41C9FC.10503@my.gd> <20110127195741.GA40449@icarus.home.lan> <4D41D7BE.3030208@my.gd> <20110127205845.GA41537@icarus.home.lan>
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On Thu, Jan 27, 2011 at 12:58 PM, Jeremy Chadwick <freebsd@jdc.parodius.com>wrote: > > On Thu, Jan 27, 2011 at 09:38:22PM +0100, Damien Fleuriot wrote: > > On 1/27/11 8:57 PM, Jeremy Chadwick wrote: > > > > <...snipping out stuff...> > > > We're also considering moving to faster machines but I don't think that > > will help much with our problem. > > > > I suppose additional CPU cores will be of no help at all, considering > > the kernel is single threaded and runs on cpu0 only ? > > Kernel folks should be able to talk about this in detail, but my > understanding is that the kernel itself supports multiple threads, but > the question is whether or not the drivers or relevant "pieces" (e.g. > igb(4) driver, pf, TCP stack, etc.) support SMP (multi-core/threading) > or not. I think this is referred to as something being "MPSAFE" or not. > > The 8.X kernel is NOT single-threaded. Anything but. And the stack has also been improved, I believe there are still bottlenecks but its far better than the old days. The igb driver in 8.2 creates up to 8 queues on the right hardware, they are each auto-bound to a particular CPU. The older version you are running had issues and hence multiqueue was not enabled. So, do upgrade once 8.2 is finalized :) Cheers, Jack
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