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

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Message-Id: <20110225.230939.112589117.davem@davemloft.net>
Date:	Fri, 25 Feb 2011 23:09:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	therbert@...gle.com, eric.dumazet@...il.com, shemminger@...tta.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Mon, 21 Feb 2011 18:19:55 +0000

> On Wed, 2010-09-01 at 18:32 -0700, David Miller wrote:
>> 2) TX queue datastructures in the driver get reallocated using
>>    memory in that NUMA domain.
> 
> I've previously sent patches to add an ethtool API for NUMA control,
> which include the option to allocate on the same node where IRQs are
> handled.  However, there is currently no function to allocate
> DMA-coherent memory on a specified NUMA node (rather than the device's
> node).  This is likely to be beneficial for event rings and might be
> good for descriptor rings for some devices.  (The implementation I sent
> for sfc mistakenly switched it to allocating non-coherent memory, for
> which it *is* possible to specify the node.)

The thing to do is to work with someone like FUJITA Tomonori on this.

It's simply a matter of making new APIs that take the node specifier,
have the implementations either make use of or completely ignore the node,
and have the existing APIs pass in "-1" for the node or whatever the
CPP macro is for this :-)
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