netdev - Re: state of rtcache removal...

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Message-ID: <AANLkTi=W=1ZiP4JOJwo=FccNA9aK=1bpRn=zkepXXMzi@mail.gmail.com>
Date:	Wed, 16 Feb 2011 18:59:35 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: state of rtcache removal...

On Wed, Feb 16, 2011 at 4:08 PM, David Miller <davem@...emloft.net> wrote:
>
> So I've been testing out the routing cache removal patch to see
> what the impact is on performance.
>
Interesting results.

I assume that this test is purposely using sento on a connected socket
to force sendmsg to go through the route lookup :-), so this is
showing what the benefits of rtcache are is when cache hit rate is
100%.  For comparison, it might interesting to see what the
performance is when rate is < 100%.  For instance, we often see hit
rates < 20% on front end servers.  This could be done flooding to
random addresses in 10/8 or even 0/0...  I'm hoping that without the
rtcache performance actually improves in that case!

Tom
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