Date: Wed, 23 Aug 2006 15:06:19 +0400 From: Gleb Smirnoff <glebius@FreeBSD.org> To: Pyun YongHyeon <pyunyh@gmail.com> Cc: freebsd-current@FreeBSD.org Subject: Re: call for bge(4) testers Message-ID: <20060823110619.GL96644@cell.sick.ru> In-Reply-To: <20060823105118.GJ17902@cdnetworks.co.kr> References: <20060822042023.GC12848@cdnetworks.co.kr> <20060823093741.GF96644@FreeBSD.org> <20060823095504.GI17902@cdnetworks.co.kr> <20060823100420.GG96644@cell.sick.ru> <20060823105118.GJ17902@cdnetworks.co.kr>
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On Wed, Aug 23, 2006 at 07:51:18PM +0900, Pyun YongHyeon wrote: P> > P> Its sole purpose is to reinitialize hardware for real watchdog P> > P> timeouts. It's not fix for general watchdog timeouts. As I said other P> > P> mails, the fake watchdog timeout(losing Tx interrupts) for hardwares P> > P> with Tx interrupt moderation capability could be normal thing. So I P> > P> just want to know bge(4) also has the same feature(bug). P> > P> > According to several emails about em(4) fake watchdog timeouts, the P> > problem can be fixed by setting debug.mpsafenet=0. This makes me think P> > that the problem isn't caused by TX interrupt moderation, but some race P> > in the kernel. Really, if_slowtimo() doesn't acquire driver lock before P> > checking and modifying the if_timer field. P> > P> P> Hmm... I didn't say the problem was caused by TX interrupt moderation. P> I can't sure but I'm under the impression it has *two* different issues. P> If you think fake watchdog timeout fix is not adequate one please P> let me know. I'll backout the change if you want. I don't think you should backout it until we find a solution. However, I'd ask you don't MFC it. P> > Afaik, NIC drivers that can do interrupt moderation should set a timer P> > to a sane value, based on interrupt moderation settings, so that the P> > watchdog won't be ever called fakely. P> P> Yes. Normally it should. But I saw the issues on Marvell Yukon too. Does Marvell Yukon have interrupt moderation? -- Totus tuus, Glebius. GLEBIUS-RIPN GLEB-RIPE
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