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: Sun, 9 Oct 2011 10:26:22 -0400 From: Robert Kubrick <robertkubrick@...il.com> To: Mike Galbraith <efault@....de> Cc: linux-kernel@...r.kernel.org Subject: Re: 2.6.32 / RH 6.1 scheduler bloated Will try this, but I have older kernel version running on the same hardware, with the same boot parameters, and showing a more reasonable 2us wakeup latency. Still high, but coming out of idle can be slow as you say. But 10us?? On Oct 9, 2011, at 2:03 AM, Mike Galbraith wrote: > On Sat, 2011-10-08 at 20:26 -0400, Robert Kubrick wrote: >> A simple ftrace wakeup test shows 10us latency during the idle-to-run >> transition: > > If you boot nohz=off idle=poll, and measure with cyclictest > (measure in > userspace for free), you'll likely see a remarkable difference. > > Coming out of idle can be slow, but that has more to do with silicon > than scheduler bloat (not that bloat doesn't exist mind you). My > Q6600 > box _sucks_ at getting off it's duff, even intel_idle.max_cstate=1 is > horrid. E5620 gets moving > order of magnitude more quickly with the > same kernel/config/params. > > -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