netdev - RE: [PATCH 2/3] sha512: reduce stack usage to safe number

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6D8AF45@saturn3.aculab.com>
Date:	Mon, 16 Jan 2012 11:37:34 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Eric Dumazet" <eric.dumazet@...il.com>
Cc:	"Alexey Dobriyan" <adobriyan@...il.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	<linux-crypto@...r.kernel.org>, <netdev@...r.kernel.org>,
	<ken@...elabs.ch>,
	"Steffen Klassert" <steffen.klassert@...unet.com>,
	<security@...nel.org>
Subject: RE: [PATCH 2/3] sha512: reduce stack usage to safe number

 
> By the way, I suspect previous code was chosen years ago because this
> version uses less stack but adds much more code bloat.
> 
> size crypto/sha512_generic.o crypto/sha512_generic_old.o
>    text	   data	    bss	    dec	    hex	filename
>   17369	    704	      0	  18073	   4699	crypto/sha512_generic.o
>    8249	    704	      0	   8953	   22f9	
> crypto/sha512_generic_old.o

I wonder what the difference in execution times is?
I know this is very dependant in the actual cpu
and the cold/warm cache state...

But some measurements might be useful.

	David


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