netdev - Re: [PATCH] ipv4: Cache local output routes

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Message-Id: <20120814.144729.2212634746787730897.davem@davemloft.net>
Date:	Tue, 14 Aug 2012 14:47:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	zheng.z.yan@...el.com
Cc:	netdev@...r.kernel.org, alex.shi@...el.com
Subject: Re: [PATCH] ipv4: Cache local output routes

From: "Yan, Zheng" <zheng.z.yan@...el.com>
Date: Mon, 13 Aug 2012 14:09:59 +0800

> Commit caacf05e5ad1abf causes big drop of UDP loop back performance.
> The cause of the regression is that we do not cache the local output
> routes. Each time we send a datagram from unconnected UDP socket,
> the kernel allocates a dst_entry and adds it to the rt_uncached_list.
> It creates lock contention on the rt_uncached_lock.
> 
> Reported-by: Alex Shi <alex.shi@...el.com>
> Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>

I was pretty sure not using 'fi' was necessary for semantic
reasons here, but I can't find any such requirement, so I've
applied this, thanks.
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