linux-kernel - Re: [PATCH 1/2] [CRYPTO] tcrypt: Move sg_init

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Message-ID: <20071030141754.GT4993@kernel.dk>
Date:	Tue, 30 Oct 2007 15:17:54 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] [CRYPTO] tcrypt: Move sg_init_table out of timing
	loops

On Tue, Oct 30 2007, Herbert Xu wrote:
> On Tue, Oct 30, 2007 at 06:50:58AM +0100, Jens Axboe wrote:
> >
> > How so? The reason you changed it to sg_init_table() + sg_set_buf() is
> > exactly because sg_init_one() didn't properly init the entry (as they
> > name promised).
> 
> For one of the cases yes but the other one repeatedly calls
> sg_init_one on the same sg entry while we really only need
> to initialise it once and call sg_set_buf afterwards.
> 
> Normally this is irrelevant but the loops in question are
> trying to estimate the speed of the algorithms so it's good
> to exclude as much noise from them as possible.

Ah OK, I was referring to the replacement mentioned above.

-- 
Jens Axboe

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