netdev - Re: [XFRM][RFC v1] Fix unexpected SA hard expiration after setting new date

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Message-ID: <20120619074342.GA32309@gondor.apana.org.au>
Date:	Tue, 19 Jun 2012 15:43:42 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	fan.du@...driver.com, netdev@...r.kernel.org, fdu@...driver.com
Subject: Re: [XFRM][RFC v1] Fix unexpected SA hard expiration after setting
 new date

On Tue, Jun 19, 2012 at 12:34:22AM -0700, David Miller wrote:
> 
> But I seem to remember that last time this issue came up the
> suggestion was to use highres timers.  Someone tried but they did an
> amazingly poor job so the effort just died off.  It takes someone with
> some skill because highres timers operate with different context
> requirements than normal timers.

Sorry I think I didn't see that discussion or if I did, then
it has completely left my mind :)

So excuse my ignorance, are highres timers relative like jiffies
or absolute? If it's absolute, I don't see how it would impact this
case.

If it's relative, what exactly does it buy for us over jiffies?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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