linux-kernel - Re: [PATCH] SLUB use cmpxchg

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:	22 Aug 2007 03:28:07 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Christoph Lameter <clameter@....com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> writes:
> 
> The measurements I get (in cycles):
>              enable interrupts (STI)   disable interrupts (CLI)   local CMPXCHG
> IA32 (P4)    112                        82                         26
> x86_64 AMD64 125                       102                         19

What exactly did you benchmark here? On K8 CLI/STI are only supposed
to be a few cycles. pushf/popf might me more expensive, but not that much.

-Andi
-
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/