netdev - Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

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Message-ID: <AANLkTin2rmcsxHi6+bFEUykhrkoWs--hrisAx_v__k1D@mail.gmail.com>
Date:	Wed, 1 Sep 2010 08:41:14 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

> Why don't we do this in the normal transmit processing.
> There is already so much policy mechanism filters/actions/qdisc that
> doing it in higher level is fighting against these.
>
Are you proposing that TX queue selection be done in the qdiscs?  The
queue has to be selected before taking the lock (cannot afford taking
a lock over the whole interface).  This would necessitate moving the
locking and probably rearranging a lot of the xmit code around that.

Tom
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