linux-kernel - Re: [RFC HIFN 00/02]: RNG support

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Message-ID: <20071118040436.GA25705@gondor.apana.org.au>
Date:	Sun, 18 Nov 2007 12:04:37 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	linux-crypto@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mb@...sch.de
Subject: Re: [RFC HIFN 00/02]: RNG support

On Sun, Nov 18, 2007 at 12:04:01PM +0800, Herbert Xu wrote:
> On Sun, Nov 18, 2007 at 04:30:40AM +0100, Patrick McHardy wrote:
> >
> > On a related issue, I think the rng interface is not very suitable
> > for chips like HIFN that have a constant random bandwidth, it would
> > make a lot more sense to return the time to wait to the core, instead
> > of waiting 10us in all cases. 256 cycles at a speed of 266MHz comes
> > down to 0.96us, so we're waiting about 10 times as long as necessary.
> > Since its busy waiting anyway, I'd think that from a performance POV
> > constant polling or returning the exact amount of time would be more
> > reasonable.
> 
> I agree, a better interface would be to let the hardware do the
> blocking where necessary.

I meant the hardware driver of course.

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