Date: Wed, 4 Aug 2004 23:02:44 -0400 From: Brian Fundakowski Feldman <green@FreeBSD.org> To: Robert Watson <rwatson@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net bpf.c Message-ID: <20040805030244.GB58239@green.homeunix.org> In-Reply-To: <200408050237.i752baAT049513@repoman.freebsd.org> References: <200408050237.i752baAT049513@repoman.freebsd.org>
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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? -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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