netdev - Re: [IPSEC] flow: Cache negative results

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Message-ID: <20070111112932.GA24696@gondor.apana.org.au>
Date:	Thu, 11 Jan 2007 22:29:32 +1100
From:	Herbert Xu <herbert.xu@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	vyekkirala@...stedcs.com, jmorris@...ei.org,
	netdev@...r.kernel.org, paul.moore@...com
Subject: Re: [IPSEC] flow: Cache negative results

On Wed, Jan 10, 2007 at 10:06:05PM -0800, David Miller wrote:
> 
> One thing we could do is force a full flow cache flush when some
> percentage before the generation count would overflow.  Say every
> %80 of the generation ID space?  That gives enough space to ensure
> the flush tasklet runs before the ID really does wrap.

Yes that would be a good solution.  It'd prevent overflows from causing
any damage and is also pretty light weight (just a single comparison
every time the genid changes).

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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