Hi Michal,
> On Jun 26, 2019, at 1:26 AM, Michal Koutný wrote:
>
> Hello Song and I apology for late reply.
>
> I understand the motivation for the headroom attribute is to achieve
> side load throttling before the CPU is fully saturated since your
> measurements show that something else gets s
Hello Song and I apology for late reply.
I understand the motivation for the headroom attribute is to achieve
side load throttling before the CPU is fully saturated since your
measurements show that something else gets saturated earlier than CPU
and causes grow of the observed latency.
The second
Hi Michal,
> On May 21, 2019, at 6:47 AM, Michal Koutný wrote:
>
> Hello Song.
>
> On Wed, Apr 10, 2019 at 07:43:35PM +, Song Liu
> wrote:
>> The load level above is measured as requests-per-second.
>>
>> When there is no side workload, the system has about 45% busy CPU with
>> load le
Hello Song.
On Wed, Apr 10, 2019 at 07:43:35PM +, Song Liu
wrote:
> The load level above is measured as requests-per-second.
>
> When there is no side workload, the system has about 45% busy CPU with
> load level of 1.0; and about 75% busy CPU at load level of 1.5.
>
> The saturation st
Hi Vincent,
> On May 15, 2019, at 3:18 AM, Vincent Guittot
> wrote:
>
> Hi Song,
>
> On Tue, 14 May 2019 at 22:58, Song Liu wrote:
>>
>> Hi Vincent,
>>
>
> [snip]
>
>>>
>>> Here are some more results with both Viresh's patch and the cpu.headroom
>>> set. In these tests, the side job runs
Hi Song,
On Tue, 14 May 2019 at 22:58, Song Liu wrote:
>
> Hi Vincent,
>
[snip]
> >
> > Here are some more results with both Viresh's patch and the cpu.headroom
> > set. In these tests, the side job runs with SCHED_IDLE, so we get benefit
> > of Viresh's patch.
> >
> > We collected another metr
Hi Vincent,
> On May 10, 2019, at 11:22 AM, Song Liu wrote:
>
>
>
>> On Apr 30, 2019, at 9:54 AM, Song Liu wrote:
>>
>>
>>
>>> On Apr 30, 2019, at 12:20 PM, Vincent Guittot
>>> wrote:
>>>
>>> Hi Song,
>>>
>>> On Tue, 30 Apr 2019 at 08:11, Song Liu wrote:
> On Apr
> On Apr 30, 2019, at 9:54 AM, Song Liu wrote:
>
>
>
>> On Apr 30, 2019, at 12:20 PM, Vincent Guittot
>> wrote:
>>
>> Hi Song,
>>
>> On Tue, 30 Apr 2019 at 08:11, Song Liu wrote:
>>>
>>>
>>>
On Apr 29, 2019, at 8:24 AM, Vincent Guittot
wrote:
Hi Song,
>>>
> On Apr 30, 2019, at 12:20 PM, Vincent Guittot
> wrote:
>
> Hi Song,
>
> On Tue, 30 Apr 2019 at 08:11, Song Liu wrote:
>>
>>
>>
>>> On Apr 29, 2019, at 8:24 AM, Vincent Guittot
>>> wrote:
>>>
>>> Hi Song,
>>>
>>> On Sun, 28 Apr 2019 at 21:47, Song Liu wrote:
Hi Morten an
Hi Song,
On Tue, 30 Apr 2019 at 08:11, Song Liu wrote:
>
>
>
> > On Apr 29, 2019, at 8:24 AM, Vincent Guittot
> > wrote:
> >
> > Hi Song,
> >
> > On Sun, 28 Apr 2019 at 21:47, Song Liu wrote:
> >>
> >> Hi Morten and Vincent,
> >>
> >>> On Apr 22, 2019, at 6:22 PM, Song Liu wrote:
> >>>
> >>>
> On Apr 29, 2019, at 8:24 AM, Vincent Guittot
> wrote:
>
> Hi Song,
>
> On Sun, 28 Apr 2019 at 21:47, Song Liu wrote:
>>
>> Hi Morten and Vincent,
>>
>>> On Apr 22, 2019, at 6:22 PM, Song Liu wrote:
>>>
>>> Hi Vincent,
>>>
On Apr 17, 2019, at 5:56 AM, Vincent Guittot
wrote
Hi Song,
On Sun, 28 Apr 2019 at 21:47, Song Liu wrote:
>
> Hi Morten and Vincent,
>
> > On Apr 22, 2019, at 6:22 PM, Song Liu wrote:
> >
> > Hi Vincent,
> >
> >> On Apr 17, 2019, at 5:56 AM, Vincent Guittot
> >> wrote:
> >>
> >> On Wed, 10 Apr 2019 at 21:43, Song Liu wrote:
> >>>
> >>> Hi Mor
Hi Morten and Vincent,
> On Apr 22, 2019, at 6:22 PM, Song Liu wrote:
>
> Hi Vincent,
>
>> On Apr 17, 2019, at 5:56 AM, Vincent Guittot
>> wrote:
>>
>> On Wed, 10 Apr 2019 at 21:43, Song Liu wrote:
>>>
>>> Hi Morten,
>>>
On Apr 10, 2019, at 4:59 AM, Morten Rasmussen
wrote:
>>>
Hi Vincent,
> On Apr 17, 2019, at 5:56 AM, Vincent Guittot
> wrote:
>
> On Wed, 10 Apr 2019 at 21:43, Song Liu wrote:
>>
>> Hi Morten,
>>
>>> On Apr 10, 2019, at 4:59 AM, Morten Rasmussen
>>> wrote:
>>>
>
>>>
>>> The bit that isn't clear to me, is _why_ adding idle cycles helps your
>>>
On Wed, 10 Apr 2019 at 21:43, Song Liu wrote:
>
> Hi Morten,
>
> > On Apr 10, 2019, at 4:59 AM, Morten Rasmussen
> > wrote:
> >
> >
> > The bit that isn't clear to me, is _why_ adding idle cycles helps your
> > workload. I'm not convinced that adding headroom gives any latency
> > improvements
Hi Peter,
> On Apr 8, 2019, at 2:45 PM, Song Liu wrote:
>
> Servers running latency sensitive workload usually aren't fully loaded for
> various reasons including disaster readiness. The machines running our
> interactive workloads (referred as main workload) have a lot of spare CPU
> cycles
Hi Morten,
> On Apr 10, 2019, at 4:59 AM, Morten Rasmussen
> wrote:
>
> Hi,
>
> On Mon, Apr 08, 2019 at 02:45:32PM -0700, Song Liu wrote:
>> Servers running latency sensitive workload usually aren't fully loaded for
>> various reasons including disaster readiness. The machines running our
>>
Hi,
On Mon, Apr 08, 2019 at 02:45:32PM -0700, Song Liu wrote:
> Servers running latency sensitive workload usually aren't fully loaded for
> various reasons including disaster readiness. The machines running our
> interactive workloads (referred as main workload) have a lot of spare CPU
> cycle
Servers running latency sensitive workload usually aren't fully loaded for
various reasons including disaster readiness. The machines running our
interactive workloads (referred as main workload) have a lot of spare CPU
cycles that we would like to use for optimistic side jobs like video
encodi
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