linux-kernel - Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

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: <513626E9.2040509@redhat.com>
Date:	Tue, 05 Mar 2013 12:10:01 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Emmanuel Benisty <benisty.e@...il.com>,
	"Vinod, Chegu" <chegu_vinod@...com>,
	"Low, Jason" <jason.low2@...com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>, aquini@...hat.com,
	Michel Lespinasse <walken@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Larry Woodman <lwoodman@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

On 03/05/2013 04:35 AM, Davidlohr Bueso wrote:

> 2) While on an Oracle swingbench DSS (data mining) workload the
> improvements are not as exciting as with Rik's benchmark, we can see
> some positive numbers. For an 8 socket machine the following are the
> percentages of %sys time incurred in the ipc lock:
>
> Baseline (3.9-rc1):
> 100 swingbench users: 8,74%
> 400 swingbench users: 21,86%
> 800 swingbench users: 84,35%
>
> With this patchset:
> 100 swingbench users: 8,11%
> 400 swingbench users: 19,93%
> 800 swingbench users: 77,69%

Does the swingbench DSS workload use multiple semaphores, or
just one?

Your patches look like a great start to make the semaphores
more scalable. If the swingbench DSS workload uses multiple
semaphores, I have ideas for follow-up patches to make things
scale better.

What does ipcs output look like while running swingbench DSS?

-- 
All rights reversed
--
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/