linux-kernel - Re: sched-devel latencies

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Date:	Mon, 18 Feb 2008 16:35:52 +0530
From:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
To:	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Srivatsa Vaddagiri" <vatsa@...ux.vnet.ibm.com>,
	"Aneesh Kumar KV" <aneesh.kumar@...ux.vnet.ibm.com>, efault@....de,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: sched-devel latencies

On Feb 18, 2008 4:31 PM, Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:
> On Mon, Feb 18, 2008 at 04:19:33PM +0530, Dhaval Giani wrote:
> > Hi Ingo,
> >
> > I am running the sched-devel tree (at HEAD
> > 44e770a8750abc7e876076cda718b413bad9e654) and it is not looking good.
> >
> > I am running two "make -j"s for the kernel in two different cgroups and
> > interactivity is going for a toss. I can see noticable lags in
> > keypresses.
> >
> > Will get down to debugging it further a bit later on.
> >
>
> Some more numbers, with exact scenario
>
> 1. Mount the cgroup
> 2. Make 3 groups
> 3. Start kernbench in each group
> 4. Start chew.
>
> This is the chew output from the root cgroup
>
> [root@...11 dhaval]# ./chew2
> pid 29345 preempted 544115 us after 1560 us
> pid 29345 preempted 588109 us after 3935 us
> pid 29345 preempted 632122 us after 3941 us
> pid 29345 preempted 794259 us after 3954 us
> pid 29345 preempted 972163 us after 3963 us
> pid 29345 preempted 1024219 us after 3942 us
>
> From within one of the groups
> [root@...11 dhaval]# ./chew2
> pid 27961 preempted 4028 us after 1708 us
> pid 27961 preempted 28090 us after 5466 us
> pid 27961 preempted 52021 us after 6505 us
> pid 27961 preempted 56100 us after 7183 us
> pid 27961 preempted 61850 us after 7505 us
> pid 27961 preempted 131892 us after 59 us
> pid 27961 preempted 332112 us after 7607 us
>

Is there anything to compare this data against? Was it better earlier,
if so which release?

Balbir
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