linux-kernel - Re: [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance

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]

Date:	Mon, 9 Jul 2007 08:50:44 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, mbligh@...gle.com
Subject: Re: [patch 00/10] [RFC] SLUB patches for more functionality,
 performance and maintenance

On Sun, 8 Jul 2007, Andi Kleen wrote:

> Christoph Lameter <clameter@....com> writes:
> 
> > A cmpxchg is less costly than interrupt enabe/disable
> 
> That sounds wrong.

Martin Bligh was able to significantly increase his LTTng performance 
by using cmpxchg. See his article in the 2007 proceedings of the OLS 
Volume 1, page 39.

His numbers were:

interrupts enable disable : 210.6ns
local cmpxchg             : 9.0ns
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/