linux-kernel - Re: load balancing regression since commit 367456c7

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:	Fri, 20 Apr 2012 18:53:57 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Alex Shi <alex.shi@...el.com>, Ying <ying.huang@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: load balancing regression since commit 367456c7

On Fri, 2012-04-20 at 09:40 -0700, Tim Chen wrote:
> We also do not see regression for hackbench on WSM-EP, but only 
> on machines with Sandy-Bridge EP (2 socket, 8 cores/socket, HT enabled).  

Argh, Suresh, any idea what could be different and relevant to this
issue between WSM and SNB -EP ?

Tim, can you see the problem on the desktop SNB part? That's the only
SNB I have available.

> We are not running hackbench in cgroup for this test.
> 
> The Sandy Bridge EP machines installed has FC16, so I think it uses 
> systemd. The machine on our WSM EP has FC15, which also has systemd.

Ah, but your .config has:

CONFIG_CGROUP_SCHED=y
CONFIG_SCHED_AUTOGROUP=y

and systemd, when cpu-cgroup is available, will automagically use it.

Could you disable those two CONFIG knobs and see if it persists?

If it goes away, its the cgroup balancing, if its still there its
elsewhere.

--
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/