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

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Message-Id: <20100321.182846.232914131.davem@davemloft.net>
Date:	Sun, 21 Mar 2010 18:28:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: cache bundle lookup results in flow cache

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.
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