netdev - Re: [net-next-2.6 PATCH 2/3] ixgbe: Set MSI-X vectors to NOBALANCING and set affinity

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Message-Id: <20091118.115039.41419484.davem@davemloft.net>
Date:	Wed, 18 Nov 2009 11:50:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	peter.p.waskiewicz.jr@...el.com, jeffrey.t.kirsher@...el.com,
	gospo@...hat.com, netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH 2/3] ixgbe: Set MSI-X vectors to
 NOBALANCING and set affinity

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Wed, 18 Nov 2009 19:46:10 +0000

> When forwarding between 2 ports it can be beneficial to match the
> affinity of each port's TX interrupts with the other port's RX
> interrupts.  Obviously this is not the case when the system is
> acting as an endpoint, and the situation is presumably more complex
> when forwarding between >2 ports.

Yes, but tricks like that won't be necessary with changes that Eric
Dumazet said he'd work on soon, wherein SKB frees always get scheduled
to occur on the cpu where allocation occured.

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