On Fri, Jun 19, 2020 at 02:25:20PM +0100, Valentin Schneider wrote:
>
> On 19/06/20 13:51, Qais Yousef wrote:
> > On 06/19/20 11:36, Valentin Schneider wrote:
> >>
> >> On 18/06/20 20:55, Qais Yousef wrote:
> >> > There is a report that when uclamp is enabled, a netperf UDP test
> >> > regresses
On 19/06/20 18:25, Qais Yousef wrote:
> On 06/19/20 16:17, Valentin Schneider wrote:
>
> [...]
>
>> > But here this is
>> > just extra churn.
>> >
>> > If an imbalance has happend this means either:
>> >
>> > 1. enqueue/dequeue_task() is imablanced itself
>> > 2.
On 06/19/20 19:45, Peter Zijlstra wrote:
> On Thu, Jun 18, 2020 at 08:55:25PM +0100, Qais Yousef wrote:
>
> > +/*
> > + * This static key is used to reduce the uclamp overhead in the fast path.
> > It
> > + * only disables the call to uclamp_rq_{inc, dec}() in
> > enqueue/dequeue_task().
> > +
On Thu, Jun 18, 2020 at 08:55:25PM +0100, Qais Yousef wrote:
> +/*
> + * This static key is used to reduce the uclamp overhead in the fast path. It
> + * only disables the call to uclamp_rq_{inc, dec}() in
> enqueue/dequeue_task().
> + *
> + * This allows users to continue to enable uclamp in
On 06/19/20 16:17, Valentin Schneider wrote:
[...]
> > But here this is
> > just extra churn.
> >
> > If an imbalance has happend this means either:
> >
> > 1. enqueue/dequeue_task() is imablanced itself
> > 2. uclamp_update_active() calls dec without inc.
> >
> > If 1 happened we
On 06/19/20 12:57, Mel Gorman wrote:
> On Fri, Jun 19, 2020 at 11:36:46AM +0100, Valentin Schneider wrote:
> > >nouclamp uclamp
> > > uclamp-static-key
> > > Hmean send-64 162.43 ( 0.00%) 157.84 * -2.82%*
> > >
On 19/06/20 15:13, Qais Yousef wrote:
> On 06/19/20 14:25, Valentin Schneider wrote:
>>
>> On 19/06/20 13:51, Qais Yousef wrote:
>> > On 06/19/20 11:36, Valentin Schneider wrote:
>> >>
>> >> On 18/06/20 20:55, Qais Yousef wrote:
>> >> > There is a report that when uclamp is enabled, a netperf
On 06/19/20 14:25, Valentin Schneider wrote:
>
> On 19/06/20 13:51, Qais Yousef wrote:
> > On 06/19/20 11:36, Valentin Schneider wrote:
> >>
> >> On 18/06/20 20:55, Qais Yousef wrote:
> >> > There is a report that when uclamp is enabled, a netperf UDP test
> >> > regresses compared to a kernel
On 19/06/20 13:51, Qais Yousef wrote:
> On 06/19/20 11:36, Valentin Schneider wrote:
>>
>> On 18/06/20 20:55, Qais Yousef wrote:
>> > There is a report that when uclamp is enabled, a netperf UDP test
>> > regresses compared to a kernel compiled without uclamp.
>> >
>> >
On Fri, 19 Jun 2020 13:51:48 +0100
Qais Yousef wrote:
> > On 18/06/20 20:55, Qais Yousef wrote:
> > > There is a report that when uclamp is enabled, a netperf UDP test
> > > regresses compared to a kernel compiled without uclamp.
> > >
> > >
On 06/19/20 12:57, Mel Gorman wrote:
> On Fri, Jun 19, 2020 at 11:36:46AM +0100, Valentin Schneider wrote:
> > >nouclamp uclamp
> > > uclamp-static-key
> > > Hmean send-64 162.43 ( 0.00%) 157.84 * -2.82%*
> > >
On 06/19/20 11:36, Valentin Schneider wrote:
>
> On 18/06/20 20:55, Qais Yousef wrote:
> > There is a report that when uclamp is enabled, a netperf UDP test
> > regresses compared to a kernel compiled without uclamp.
> >
> > https://lore.kernel.org/lkml/20200529100806.ga3...@suse.de/
> >
>
>
On 19/06/20 12:57, Mel Gorman wrote:
> On Fri, Jun 19, 2020 at 11:36:46AM +0100, Valentin Schneider wrote:
>> >nouclamp uclamp
>> > uclamp-static-key
>> > Hmean send-64 162.43 ( 0.00%) 157.84 * -2.82%*
>> >
On Fri, Jun 19, 2020 at 11:36:46AM +0100, Valentin Schneider wrote:
> >nouclamp uclamp
> > uclamp-static-key
> > Hmean send-64 162.43 ( 0.00%) 157.84 * -2.82%*
> > 163.39 * 0.59%*
> > Hmean send-128
On 18/06/20 20:55, Qais Yousef wrote:
> Reported-by: Mel Gorman
> Fixes: 69842cba9ace ("sched/uclamp: Add CPU's clamp buckets refcounting")
> Signed-off-by: Qais Yousef
> Cc: Juri Lelli
> Cc: Vincent Guittot
> Cc: Dietmar Eggemann
> Cc: Steven Rostedt
> Cc: Ben Segall
> Cc: Mel Gorman
>
On 18/06/20 20:55, Qais Yousef wrote:
> There is a report that when uclamp is enabled, a netperf UDP test
> regresses compared to a kernel compiled without uclamp.
>
> https://lore.kernel.org/lkml/20200529100806.ga3...@suse.de/
>
ISTR the perennial form for those is: https://lkml.kernel.org/r/
There is a report that when uclamp is enabled, a netperf UDP test
regresses compared to a kernel compiled without uclamp.
https://lore.kernel.org/lkml/20200529100806.ga3...@suse.de/
While investigating the root cause, there were no sign that the uclamp
code is doing anything particularly
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