Date: Fri, 17 Sep 2004 18:36:44 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: "Raphael H. Becker" <rabe@p-i-n.com> Cc: freebsd-current@freebsd.org Subject: Re: de0 doze off Message-ID: <Pine.NEB.3.96L.1040917183549.72864B-100000@fledge.watson.org> In-Reply-To: <20040917234140.H55054@p-i-n.com>
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On Fri, 17 Sep 2004, Raphael H. Becker wrote: > > Looks good. This may result in reduced stability, but it may also tell us > > specifically if there's a problem with the IFF_NEEDSGIANT mechanism. > > two parallel wget saturate the link to an average of ~12MByte/sec > (netstat 1) for some hours. seems to work perfect now, constant full > speed. > > I transferred around 180 copies of the miniinst.iso and ran a md5 on > lots of the file to detect xfer-errors, nothing failed, no more errors. So it sounds like there may be a race in the IFF_NEEDSGIANT implementation -- perhaps a lost task event when queueing occurs while the task is running. I'll need to come up with a patch that allows us to make sure this is the case, and get back to you tonight or tomorrow. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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