netdev - Re: tx queue hashing hot-spots and poor performance (multiq, ixgbe)

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Message-Id: <20090430.040535.247823152.davem@davemloft.net>
Date:	Thu, 30 Apr 2009 04:05:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jelaas@...il.com
Cc:	andrew@...dna.net, netdev@...r.kernel.org
Subject: Re: tx queue hashing hot-spots and poor performance (multiq, ixgbe)

From: Jens Låås <jelaas@...il.com>
Date: Thu, 30 Apr 2009 12:51:16 +0200

> The main problem though was that the mapping is randomized. We wanted
> to set smp_affinity correctly for tx to match rx. That was actually
> the main reason for our local hacks.

It's NOT RANDOMIZED, READ THE CODE!

It takes the RX queue number and uses it to select the TX
queue.

That anything but random!
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