Hello, Vincent,
Very cool, thank you for running this! So more than an order of
magnitude improvement over your results from February, and significant
improvement from this patch series compared to 3.5.
Not bad!
Thanx, Paul
On Thu, Jul 26, 2012 at 10:03:35AM +0200, Vincent Guittot wrote:
> Hi,
>
> I have run some tests to measure the improvement of the cpu plug
> duration with Tejun's patches. The results are available on this link:
> https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/Hotplug#Workqueue
>
> As a summary, we can see a reduction of the plug sequence compared to
> the kernel v3.5 as kthreads are parked instead of being destroyed
>
> Regards,
> Vincent
>
> On 21 July 2012 19:24, Paul E. McKenney <paul...@linux.vnet.ibm.com> wrote:
> > On Fri, Jul 20, 2012 at 02:14:46PM -0700, Paul E. McKenney wrote:
> >> Hello!
> >>
> >> Tejun just this week posted patches that park the workqueue kthreads,
> >> which should reduce CPU-online latency under load. The easiest way to
> >> get these patches appears to be to pull them from Tejun's git tree:
> >>
> >> git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-wq-hotplug
> >>
> >> They pass some extremely mild rcutorture/hotplug testing, and more testing
> >> will follow. Please take a look at these and give them a go.
> >
> > And they pass moderate rcutorture/hotplug testing in a number of SMP
> > configurations. The UP tests failed due to an apparently unrelated
> > issue that I am chasing down.
> >
> > Thanx, Paul
> >
>
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