linux-kernel - Re: [PATCH 1/2] tuntap: reduce memory using of queues

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Message-Id: <20130123.134736.1854102244959594689.davem@davemloft.net>
Date:	Wed, 23 Jan 2013 13:47:36 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, eric.dumazet@...il.com,
	dwmw2@...radead.org
Subject: Re: [PATCH 1/2] tuntap: reduce memory using of queues

From: Jason Wang <jasowang@...hat.com>
Date: Wed, 23 Jan 2013 21:59:12 +0800

> A MAX_TAP_QUEUES(1024) queues of tuntap device is always allocated
> unconditionally even userspace only requires a single queue device. This is
> unnecessary and will lead a very high order of page allocation when has a high
> possibility to fail. Solving this by creating a one queue net device when
> userspace only use one queue and also reduce MAX_TAP_QUEUES to
> DEFAULT_MAX_NUM_RSS_QUEUES which can guarantee the success of
> the allocation.
> 
> Reported-by: Dirk Hohndel <dirk@...ndel.org>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied.
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