netdev - Re: ip_summed setting for TCP pure-ACK packets

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Message-ID: <1289235366.15376.3.camel@edumazet-laptop>
Date:	Mon, 08 Nov 2010 17:56:06 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>,
	sf-linux-drivers <linux-net-drivers@...arflare.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: ip_summed setting for TCP pure-ACK packets

Le lundi 08 novembre 2010 à 16:35 +0000, Ben Hutchings a écrit :
> As we discussed at LPC:
> 
> Current controllers handled by the sfc driver have a per-queue (rather
> than per-packet) option for checksum generation.  Currently pure-ACK
> packets sent by TCP have ip_summed == CHECKSUM_NONE and we must send
> them on hardware queues with checksum generation disabled.  To support
> this, we allocate 2 hardware queues per core TX queue.
> 
> To reduce the risk of reordering (and possibly the number of hardware TX
> queues required), it would be helpful for TCP to set ip_summed ==
> CHECKSUM_PARTIAL on pure-ACK packets when the output device is known to
> support checksum generation.
> 
> Ben.
> 

Hmm

Do you mean commit 2e8e18ef52e7dd1af0a3bd1 is not enough ?



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