linux-kernel - Re: [RFC][PATCH 0/5] Signal scalability series

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: <1317675520.3375.82.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Mon, 03 Oct 2011 21:58:40 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Mosberger-Tang <davidm@...uge.net>
Subject: Re: [RFC][PATCH 0/5] Signal scalability series

On Mon, 2011-10-03 at 18:35 +0200, Oleg Nesterov wrote:
> On 10/03, Matt Fleming wrote:
> >
> > Oh, are you referring to Oleg's email about the slow down under kvm?
> > Yeah, admittedly that's a pretty clear indicator that something is wrong
> > with the approach in this patch series.
> 
> Or there was something wrong with my testing, please recheck. I specially
> mentioned I was surprised by the numbers. May be kvm, or lockdep...

No, I don't think there was anything wrong with your testing method. I
ran your command-line under Qemu and saw similar results - with the
patches applied the single-threaded case slows down (not by 50%, it
looks more like 25%, but that's still unacceptable and not at all what I
had anticipated).

-- 
Matt Fleming, Intel Open Source Technology Center

--
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/