linux-kernel - Re: [RFC PATCH] crypto: crc32c-pclmul

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Message-ID: <1401466248.2970.462.camel@schen9-DESK>
Date:	Fri, 30 May 2014 09:10:48 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	George Spelvin <linux@...izon.com>
Cc:	herbert@...dor.apana.org.au, james.guilford@...el.com,
	JBeulich@...e.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] crypto: crc32c-pclmul - Use pmovzxdq to shrink
 K_table

On Fri, 2014-05-30 at 01:25 -0400, George Spelvin wrote:

> 
> Averaging the 8K bytes per update, I do see an average of 3.2 cycles per
> operation (that is, per 8K of data processed) lost, or about 1 cycle per
> (3K or less) block processed.  I'm hoping the reduced D-cache polution
> makes it up somewhere else.

That's very small (less than 0.2%) so I think it's acceptable.

Tim


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