netdev - Re: [PATCH] net: fix multiqueue selection

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Date:	Wed, 11 Sep 2013 16:13:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	alexander.duyck@...il.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	alexander.h.duyck@...el.com
Subject: Re: [PATCH] net: fix multiqueue selection

From: Alexander Duyck <alexander.duyck@...il.com>
Date: Sat, 07 Sep 2013 21:08:59 -0700

> On 09/07/2013 12:02 PM, Eric Dumazet wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>> 
>> commit 416186fbf8c5b4e4465 ("net: Split core bits of netdev_pick_tx
>> into __netdev_pick_tx") added a bug that disables caching of queue
>> index in the socket.
>> 
>> This is the source of packet reorders for TCP flows, and
>> again this is happening more often when using FQ pacing.
>> 
>> Old code was doing 
>> 
>> if (queue_index != old_index)
>> 	sk_tx_queue_set(sk, queue_index);
>> 
>> Alexander renamed the variables but forgot to change sk_tx_queue_set()
>> 2nd parameter.
>> 
>> if (queue_index != new_index)
>> 	sk_tx_queue_set(sk, queue_index);
>> 
>> This means we store -1 over and over in sk->sk_tx_queue_mapping
>> 
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
 ...
> Ugh, my bad.  This is a nasty one too since the behaviour appeared to be
> correct for most cases.
> 
> It looks like this needs to go into stable for 3.9 - 3.11.
> 
> Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>
> 

Applied and queued up for -stable, thanks.
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