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

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Date:	Fri, 19 Mar 2010 08:31:30 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teräs <timo.teras@....fi>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] xfrm: cache bundle lookup results in flow cache

On Thu, Mar 18, 2010 at 09:30:58PM +0200, Timo Teräs wrote:
>
> Now, these created xfrm_dst gets cached in policy->bundles
> with ref count zero and not deleted until garbage collection
> is required. That's how xfrm_find_bundle tries to reuse them
> (but it does O(n) lookup).

Yes but the way you're caching it in the policy means that it
only helps if two consecutive packets happen to match the same
bundle.  If your traffic mix was such that each packet required
a different bundle, then we're back to where we started.

That's why I was asking for you to directly cache the xfrm_dst
objects in the flow cache.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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