linux-kernel - Re: [PATCH v7 0/8] Tunable sched_mc_power

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: <20090106184552.GI17198@balbir.in.ibm.com>
Date:	Wed, 7 Jan 2009 00:15:52 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Mike Galbraith <efault@....de>
Cc:	svaidy@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n

* Mike Galbraith <efault@....de> [2009-01-06 18:48:37]:

> On Tue, 2009-01-06 at 20:37 +0530, Vaidyanathan Srinivasan wrote:
> 
> > Hi Mike,
> > 
> > Thanks for the detailed benchmark reports.  Glad to hear that
> > sched_mc=2 is helping in most scenarios.  Though we would be tempted to
> > make it default, I would still like to default to zero in order to
> > provide base line performance.  I would expect end users to flip the
> > settings to sched_mc=2 if it helps their workload in terms of
> > performance and/or power savings.
> 
> The mysql+oltp peak loss is there either way, but with 2, mid range
> throughput is ~28 baseline.  High end (yawn) is better, and the nfs
> kbuild performs better than baseline.
> 
> Baseline performance, at least wrt mysql+oltp doesn't seem to be an
> option.  Not my call.  More testing and more testers required I suppose.

Yes, more testing is definitely due. I'd like to hear from people
with larger and newer boxes as well before I would be comfortable making
sched_mc=2 as default.

-- 
	Balbir
--
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/