From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Antti P Miettinen <amiettinen@nvidia.com>
Cc: linux-pm@lists.linux-foundation.org
Subject: Re: [PATCH 0/6] RFC: CPU frequency min/max as PM QoS params
Date: Thu, 12 Jan 2012 00:15:55 +0100 [thread overview]
Message-ID: <201201120015.55740.rjw@sisk.pl> (raw)
In-Reply-To: <87vcoid7j5.fsf@amiettinen-lnx.nvidia.com>
On Wednesday, January 11, 2012, Antti P Miettinen wrote:
> "Rafael J. Wysocki" <rjw@sisk.pl> writes:
> > On Monday, January 09, 2012, Antti P Miettinen wrote:
> >> Hmm.. congestion is an issue for latency requests as well.
> >
> > I'm not sure what you mean. Care to elaborate?
> >
> > Rafael
>
> Well, I was just thinking that latencies can get hurt by system load
> just like throughput can suffer from load.
The idea with latencies is different. Latency constraints specify how
much time a given resource may be unavailable (due to power management).
So, when putting the resource into a low-power state we only need to
consider the minimum of those.
> By blocking sleep states we can address "system level latency" or "best case
> latency" but as far as I can see PM QoS does not address "worst case
> latency".
I'm not sure what you mean by "worst case latency".
Thanks,
Rafael
next prev parent reply other threads:[~2012-01-11 23:15 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-06 0:36 [PATCH 0/6] RFC: CPU frequency min/max as PM QoS params Antti P Miettinen
2012-01-06 0:36 ` [PATCH 1/6] PM QoS: Simplify PM QoS expansion/merge Antti P Miettinen
2012-01-06 15:24 ` mark gross
2012-01-08 23:03 ` Rafael J. Wysocki
2012-01-06 0:36 ` [PATCH 2/6] PM QoS: Add CPU frequency min/max as PM QoS params Antti P Miettinen
2012-01-06 15:30 ` mark gross
2012-01-06 19:32 ` Antti P Miettinen
2012-01-07 3:47 ` mark gross
2012-01-07 8:54 ` Antti P Miettinen
2012-01-06 0:36 ` [PATCH 3/6] cpufreq: Export user_policy min/max Antti P Miettinen
2012-01-06 15:33 ` mark gross
2012-01-06 19:29 ` Antti P Miettinen
2012-01-07 3:53 ` mark gross
2012-01-07 8:47 ` Antti P Miettinen
2012-01-09 14:18 ` mark gross
2012-01-06 0:36 ` [PATCH 4/6] cpufreq: Preserve sysfs min/max request Antti P Miettinen
2012-01-06 0:36 ` [PATCH 5/6] cpufreq: Enforce PM QoS min/max limits Antti P Miettinen
2012-01-06 15:38 ` mark gross
2012-01-06 0:36 ` [PATCH 6/6] input: CPU frequency booster Antti P Miettinen
2012-01-06 15:40 ` mark gross
2012-01-06 15:18 ` [PATCH 0/6] RFC: CPU frequency min/max as PM QoS params mark gross
2012-01-06 15:46 ` mark gross
2012-01-06 19:38 ` Antti P Miettinen
2012-01-07 2:57 ` mark gross
2012-01-06 18:27 ` mark gross
2012-01-08 22:59 ` Rafael J. Wysocki
2012-01-09 14:23 ` mark gross
2012-01-09 21:27 ` Rafael J. Wysocki
2012-01-09 21:57 ` Antti P Miettinen
2012-01-10 20:44 ` Rafael J. Wysocki
2012-01-11 7:26 ` Antti P Miettinen
2012-01-11 23:15 ` Rafael J. Wysocki [this message]
2012-01-12 8:37 ` Antti P Miettinen
2012-01-12 23:55 ` Rafael J. Wysocki
2012-01-10 4:50 ` mark gross
2012-01-10 20:46 ` Rafael J. Wysocki
2012-01-10 21:02 ` Jean Pihet
2012-01-11 7:32 ` Antti P Miettinen
2012-01-11 23:00 ` Rafael J. Wysocki
2012-01-12 8:43 ` Antti P Miettinen
2012-01-13 4:37 ` mark gross
2012-01-12 3:06 ` mark gross
2012-01-12 23:52 ` Rafael J. Wysocki
2012-01-12 3:01 ` mark gross
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