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Message-ID: <1337100454.2544.25.camel@bwh-desktop.uk.solarflarecom.com> Date: Tue, 15 May 2012 17:47:34 +0100 From: Ben Hutchings <bhutchings@...arflare.com> To: Eric Dumazet <eric.dumazet@...il.com> CC: Kieran Mansley <kmansley@...arflare.com>, <netdev@...r.kernel.org> Subject: Re: TCPBacklogDrops during aggressive bursts of traffic On Tue, 2012-05-15 at 18:34 +0200, Eric Dumazet wrote: > On Tue, 2012-05-15 at 17:29 +0100, Kieran Mansley wrote: > > On Tue, 2012-05-15 at 16:56 +0200, Eric Dumazet wrote: > > > > > > Please try latest kernels, this is probably 'fixed' > > > > I've just tried with 3.4.0-rc7 and the problem is still reproducible. > > It's perhaps harder to reproduce than on 3.3.6 but still there. > > > > > What network driver are you using ? > > > > The receiver is using the sfc driver that is included in the kernel > > build, together with an SFC 9020 NIC. > > > > Kieran > > > > MTU ? 1500 > What is typical skb->truesize of skb given to stack in RX path ? > > If drivers use PAGE_SIZE fragments, then you are more likely to hit > limit. We're passing page fragments into GRO. Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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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