netdev - Re: [PATCH] net: avoid a pair of dst_hold()/dst_release() in ip_push_pending

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Message-Id: <20081124.160757.167577430.davem@davemloft.net>
Date:	Mon, 24 Nov 2008 16:07:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	andi@...stfloor.org, netdev@...r.kernel.org, minyard@....org,
	christian@...i.com
Subject: Re: [PATCH] net: avoid a pair of dst_hold()/dst_release() in
 ip_push_pending_frames()

From: Eric Dumazet <dada1@...mosbay.com>
Date: Mon, 24 Nov 2008 14:59:51 +0100

> We can reduce pressure on dst entry refcount that slowdown UDP transmit
> path on SMP machines. This pressure is visible on RTP servers when
> delivering content to mediagateways, especially big ones, handling
> thousand of streams. Several cpus send UDP frames to the same
> destination, hence use the same dst entry.
> 
> This patch makes ip_push_pending_frames() steal the refcount its
> callers had to take when filling inet->cork.dst.
> 
> This doesnt avoid all refcounting, but still gives speedups on SMP,
> on UDP/RAW transmit path.
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Applied.
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