netdev - Re: [PATCH 1/2 v7] xps: Improvements in TX queue selection

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Date:	Wed, 24 Nov 2010 11:45:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH 1/2 v7] xps: Improvements in TX queue selection

From: Tom Herbert <therbert@...gle.com>
Date: Sun, 21 Nov 2010 15:17:29 -0800 (PST)

> In dev_pick_tx, don't do work in calculating queue 
> index or setting
> the index in the sock unless the device has more than one queue.  This
> allows the sock to be set only with a queue index of a multi-queue
> device which is desirable if device are stacked like in a tunnel.
> 
> We also allow the mapping of a socket to queue to be changed.  To
> maintain in order packet transmission a flag (ooo_okay) has been
> added to the sk_buff structure.  If a transport layer sets this flag
> on a packet, the transmit queue can be changed for the socket.
> Presumably, the transport would set this if there was no possbility
> of creating OOO packets (for instance, there are no packets in flight
> for the socket).  This patch includes the modification in TCP output
> for setting this flag.
> 
> Signed-off-by: Tom Herbert <therbert@...gle.com>

Applied.
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