netdev - Re: TCPBacklogDrops during aggressive bursts of traffic

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Message-ID: <1337366443.5101.3.camel@edumazet-laptop>
Date:	Fri, 18 May 2012 20:40:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Kieran Mansley <kmansley@...arflare.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org
Subject: Re: TCPBacklogDrops during aggressive bursts of traffic

Le vendredi 18 mai 2012 à 16:45 +0100, Kieran Mansley a écrit :

> > With net-next and tcp coalescing, I no longer have TCPBacklogDrops /
> > collapses, but I dont have sfc card/driver. 
> 
> I'll try that.

By the way, we should get rid of napi_get_frags() & napi_gro_frags() API
and use plain build_skb() instead.

This would save 1024 bytes per skb, and remove lot of GRO code (frag0,
frag0_len, skb_gro_header_fast(), skb_gro_header_hard()...), since by
definition skb->head would point to the frame.





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