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Date: Thu, 15 Nov 2012 15:49:04 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Willy Tarreau <w@....eu> Cc: netdev@...r.kernel.org Subject: Re: GRO + splice panics in 3.7.0-rc5 On Thu, 2012-11-15 at 23:28 +0100, Willy Tarreau wrote: > Hello, > > I was just about to make a quick comparison between LRO and GRO in > 3.7.0-rc5 to see if LRO still had the big advantage I've always observed, > but I failed the test because as soon as I enable LRO + splice, the kernel > panics and reboots. > > I could not yet manage to catch the panic output, I could just reliably > reproduce it, it crashes instantly. > > All I can say at the moment is the following : > - test consist in forwarding HTTP traffic between two NICs via haproxy > - driver used was myri10ge > - LRO + recv+send : OK > - LRO + splice : OK > - GRO + recv+send : OK > - GRO + splice : panic > - no such problem was observed in 3.6.6 so I think this is a recent > regression. > > I'll go back digging for more information, but as I'm used to often see > Eric suggest the right candidates for reverting, I wanted to report the > issue here in case there are easy ones to try first. Hi Willy Nothing particular comes to mind, there were a lot of recent changes that could trigger this kind of bug. A stack trace would be useful of course ;) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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