Date: Tue, 22 Aug 2006 10:26:02 -0500 From: Eric Anderson <anderson@centtech.com> To: Gleb Smirnoff <glebius@freebsd.org> Cc: "Patrick M. Hausen" <hausen@punkt.de>, cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org, Pyun YongHyeon <yongari@freebsd.org> Subject: Re: cvs commit: src/sys/dev/em if_em.c Message-ID: <44EB220A.5000709@centtech.com> In-Reply-To: <20060822152333.GV96644@FreeBSD.org> References: <200608220232.k7M2WmCr080275@repoman.freebsd.org> <20060822152333.GV96644@FreeBSD.org>
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On 08/22/06 10:23, Gleb Smirnoff wrote: > On Tue, Aug 22, 2006 at 02:32:48AM +0000, Pyun YongHyeon wrote: > P> yongari 2006-08-22 02:32:48 UTC > P> > P> FreeBSD src repository > P> > P> Modified files: > P> sys/dev/em if_em.c > P> Log: > P> It seems that em(4) misses Tx completion interrupts under certain > P> conditions. The cause of missing Tx completion interrupts comes from > P> Tx interrupt moderation mechanism(delayed interrupts) or chipset bug. > P> If Tx interrupt moderation mechanism is the cause of false watchdog > P> timeout error we should have to fix all device drivers that have Tx > P> interrupt moderation capability. We may need more investigation > P> for this issue. Anyway, the fix is the same for both cases. > P> > P> This should fix occasional watchdog timeout errors seen on a few > P> systems. > P> > P> Reported by: -net, Patrick M. Hausen < hausen AT punkt DOT de > > P> Tested by: Patrick M. Hausen < hausen AT punkt DOT de > > > This look like a workaround, not a fix the root of the problem. Several > people on net said that this problem disappears if debug.mpsafenet=0. > So I think there is a problem in FreeBSD or driver, not in chip. > And it also worked perfectly for a very very long time until 6.x tree. I went from 5-STABLE to 6-STABLE and started seeing it a lot ( a few times per day) on a couple servers. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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