netdev - Re: [PATCH] xfrm: cache bundle lookup results in flow cache

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Message-ID: <20100322013257.GA14080@gondor.apana.org.au>
Date:	Mon, 22 Mar 2010 09:32:57 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: cache bundle lookup results in flow cache

On Sun, Mar 21, 2010 at 06:28:46PM -0700, David Miller wrote:
> From: Herbert Xu <herbert@...dor.apana.org.au>
> Date: Sat, 20 Mar 2010 23:17:51 +0800
> 
> > Actually I just realised that the other way we can fix this is
> > to make xfrm_dst objects per-cpu just like IPv4 routes.  That
> > is, when you fail to find an xfrm_dst object in the per-cpu
> > cache, you dont' bother calling xfrm_find_bundle but just make
> > a new bundle.
> 
> How are ipv4 routing cache entries per-cpu?  That would screw up route
> metrics for TCP sockets quite a lot if they were.

You're right of course, s/just like IPv4 routes// :)
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