Date: Wed, 13 Oct 2004 16:58:16 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Andrey Chernov <ache@nagual.pp.ru>, Bruce M Simpson <bms@spc.org>, Robert Watson <rwatson@FreeBSD.ORG>, Robert Huff <roberthuff@rcn.com>, current@FreeBSD.ORG Subject: Re: network slowness/freez-up since update 10/11 Message-ID: <20041013235816.GA35652@xor.obsecurity.org> In-Reply-To: <20041013234411.GA29777@nagual.pp.ru> References: <16749.29947.220930.46409@jerusalem.litteratus.org> <Pine.NEB.3.96L.1041013162621.84384S-100000@fledge.watson.org> <20041013232318.GN718@empiric.icir.org> <20041013234411.GA29777@nagual.pp.ru>
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On Thu, Oct 14, 2004 at 03:44:12AM +0400, Andrey Chernov wrote:
> On Wed, Oct 13, 2004 at 04:23:18PM -0700, Bruce M Simpson wrote:
> > On Wed, Oct 13, 2004 at 04:27:22PM -0400, Robert Watson wrote:
> > > There appears to bea problem with if_de cards and Giant-free operation.
> > > I'm working with John Baldwin to try and diagnose it. Could you try
> > > putting debug.mpsafenet=0 in /boot/loader.conf and reboot to confirm that
> > > this is what's going on?
> >
> > The de(4) driver is a bit of a mess as regards locking.
> > I had a look at this back in June/July but no longer have the hardware.
> > It would probably be best to bring it under IFF_NEEDSGIANT.
>
> Even with its locking mess it works perfectly in -current until late
> August.
You mean, until rwatson changed the default to debug.mpsafenet=1? :-)
----
rwatson 2004-08-28 15:11:13 UTC
FreeBSD src repository
Modified files:
sys/conf options
sys/sys kernel.h
sys/net netisr.c
Log:
Change the default disposition of debug.mpsafenet from 0 to 1, which
will cause the network stack to operate without the Giant lock by
default. This change has the potential to improve performance by
increasing parallelism and decreasing latency in network processing.
[...]
----
debug.mpsafenet=0 is the known workaround, already mentioned in this
thread. It hides the locking bugs by running the driver under Giant.
Kris
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