Re: TCPBacklogDrops during aggressive bursts of traffic

Eric Dumazet
2012-05-15T16:34:06Z

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.