Date: Wed, 4 Aug 2004 23:23:49 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.org> To: Brian Fundakowski Feldman <green@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net bpf.c Message-ID: <Pine.NEB.3.96L.1040804232326.19039G-100000@fledge.watson.org> In-Reply-To: <20040805030244.GB58239@green.homeunix.org>
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On Wed, 4 Aug 2004, Brian Fundakowski Feldman wrote: > On Thu, Aug 05, 2004 at 02:37:36AM +0000, Robert Watson wrote: > > rwatson 2004-08-05 02:37:36 UTC > > > > FreeBSD src repository > > > > Modified files: > > sys/net bpf.c > > Log: > > Do a lockless read of the BPF interface structure descriptor list head > > before grabbing BPF locks to see if there are any entries in order to > > avoid the cost of locking if there aren't any. Avoids a mutex lock/ > > unlock for each packet received if there are no BPF listeners. > > While you're there, do you want to check out the other problems I've > been noticing, relating to consistency/locking? Yes. Can you e-mail me the pointer to your patch and/or p4 branch again? I'll try to look at it tomorrow. Thanks! Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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