Re: [PATCH] ipv4: Cache local output routes

From: "Yan, Zheng" <redacted>
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 <redacted>
Signed-off-by: Yan, Zheng <redacted>

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.