netdev - RE: [PATCH] x86: Run checksumming in parallel accross multiple alu's

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B73C5@saturn3.aculab.com>
Date:	Wed, 30 Oct 2013 12:18:06 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Neil Horman" <nhorman@...driver.com>,
	"Doug Ledford" <dledford@...hat.com>
Cc:	"Ingo Molnar" <mingo@...nel.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: RE: [PATCH] x86: Run checksumming in parallel accross multiple alu's

> /me wonders if rearranging the instructions into this order:
> adcq 0*8(src), res1
> adcq 1*8(src), res2
> adcq 2*8(src), res1

Those have to be sequenced.

Using a 64bit lea to add 32bit quantities should avoid the
dependencies on the flags register.
However you'd need to get 3 of those active to beat a 64bit adc.

	David



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html