| 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
| ||
|
Date: Sat, 09 Feb 2008 14:37:39 +0100 From: Mike Galbraith <efault@....de> To: Willy Tarreau <w@....eu> Cc: Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Ingo Molnar <mingo@...e.hu> Subject: Re: Scheduler(?) regression from 2.6.22 to 2.6.24 for short-lived threads On Sat, 2008-02-09 at 12:40 +0100, Willy Tarreau wrote: > On Sat, Feb 09, 2008 at 11:58:25AM +0100, Mike Galbraith wrote: > > > > On Sat, 2008-02-09 at 09:03 +0100, Willy Tarreau wrote: > > > > > How many CPUs do you have ? > > > > It's a P4/HT, so 1 plus $CHUMP_CHANGE_MAYBE > > > > > > 2.6.25-smp (git today) > > > > time 29 ms > > > > time 61 ms > > > > time 72 ms > > > > > > These ones look rather strange. What type of workload is it ? Can you > > > publish the program for others to test it ? > > > > It's the proglet posted in this thread. > > OK sorry, I did not notice it when I first read the report. Hm. The 2.6.25-smp kernel is the only one that looks like it's doing what proggy wants to do, massive context switching. Bump threads to larger number so you can watch: the supposedly good kernel (22) is doing everything on one CPU. Everybody else sucks differently (idleness), and the clear throughput winner, via mad over-schedule (!?!), is git today. -Mike -- 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/
Powered by blists - more mailing lists