linux-kernel - Re: "sched: add vslice" causes horrible interactivity under load

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:	Sun, 27 Jan 2008 23:14:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Benjamin K. Stuhl" <benjamin.stuhl@...orado.edu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux-Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: "sched: add vslice" causes horrible interactivity under load


* Benjamin K. Stuhl <benjamin.stuhl@...orado.edu> wrote:

>   I recently upgraded from 2.6.23.x to 2.6.24 and found that whereas 
> with 2.6.23.x I could have multiple "make -j3" compilation runs going 
> in the background with no real problems (on a dual-core Core 2), with 
> 2.6.24 I get multiple-second lags when trying to switch tasks in KDE.

that sounds bad ... Could you send me the output of:

  http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh

while such delays are happening? Please enable CONFIG_SCHED_DEBUG=y and 
CONFIG_SCHEDSTATS=y as well before doing the dump. Also please send your 
.config.

to get best output from cfs-debug-info.sh, please first run this:

  http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info-clear.sh

then reproduce the delay, and then run cfs-debug-info.sh to capture all 
that task stats.

	Ingo
--
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/