linux-kernel - Re: [PATCH 2/2] mutex: Apply adaptive spinning on mutex

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: <20110325101238.GC1409@htj.dyndns.org>
Date:	Fri, 25 Mar 2011 11:12:38 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 2/2] mutex: Apply adaptive spinning on mutex_trylock()

Hello,

On Thu, Mar 24, 2011 at 10:41:51AM +0100, Tejun Heo wrote:
>         USER   SYSTEM   SIRQ    CXTSW  THROUGHPUT
>  SIMPLE 61107  354977    217  8099529  845.100 MB/sec
>  SPIN   63140  364888    214  6840527  879.077 MB/sec
> 
> On various runs, the adaptive spinning trylock consistently posts
> higher throughput.  The amount of difference varies but it outperforms
> consistently.

I've been running more of these tests and am having doubts about the
consistency.  It seems that, even on a fresh filesystem, some random
initial condition seems to have persistent effect on the whole run.
I'll run more tests and report back.

Thanks.

-- 
tejun
--
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/