netdev - Re: TCPBacklogDrops during aggressive bursts of traffic

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Message-ID: <1337099641.8512.1102.camel@edumazet-glaptop>
Date:	Tue, 15 May 2012 18:34:01 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kieran Mansley <kmansley@...arflare.com>
Cc:	netdev@...r.kernel.org
Subject: Re: TCPBacklogDrops during aggressive bursts of traffic

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 ?

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.



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