netdev - Re: [PATCH 2/2 v4] xps: Transmit Packet Steering

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Message-ID: <1288154768.2652.82.camel@edumazet-laptop>
Date:	Wed, 27 Oct 2010 06:46:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2 v4] xps: Transmit Packet Steering

Le mardi 26 octobre 2010 à 20:38 -0700, Tom Herbert a écrit :
> The benefits of XPS are improved locality in the per queue data
> structures.  Also, transmit completions are more likely to be done
> nearer to the sending thread, so this should promote locality back
> to the socket on free (e.g. UDP).  


I dont understand this part of changelog :
We now early orphan packets before giving them to device.
(see skb_orphan_try())

So at completion time, we dont touch socket anymore.

However, we free skb, so this promotes locality on kmem caches, iff tx
completion is run on same cpu.



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