From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Bruno Ducrot <ducrot@poupinou.org>
Cc: cpufreq@lists.linux.org.uk
Subject: Re: OnDemand governor vs. work queue
Date: Thu, 26 May 2005 07:26:39 +1000 [thread overview]
Message-ID: <1117056399.5076.0.camel@gaston> (raw)
In-Reply-To: <20050525095929.GD32472@poupinou.org>
On Wed, 2005-05-25 at 11:59 +0200, Bruno Ducrot wrote:
> On Wed, May 25, 2005 at 01:26:40PM +1000, Benjamin Herrenschmidt wrote:
> > Hi !
> >
> > >From what I've seen, the OnDemand governor works using a timer/workqueue
> > pair.
> >
> > That annoys me a bit as the setup I have on PowerMacs can take several
> > ms to transition (due to voltage transition mostly). I don't like the
> > idea of hogging keventd that long.
> >
> > Wouldn't it make sense, especially for setups where transition latency
> > is high (by high, I mean significant compared to HZ for example), to
> > actually spawn a kthread and do the sampling & switching from there ?
>
> I'm wondering if in that case a userspace daemon will be more suited..
This is what I do & recommend for powerbook users (so far, powernowd
works like a charm), but since OnDemand governor advertises working with
latencies as big as 10ms, I was wondering ...
Ben.
next prev parent reply other threads:[~2005-05-25 21:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-25 3:26 OnDemand governor vs. work queue Benjamin Herrenschmidt
2005-05-25 9:59 ` Bruno Ducrot
2005-05-25 21:26 ` Benjamin Herrenschmidt [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-05-25 21:34 Pallipadi, Venkatesh
2005-05-25 21:48 ` Benjamin Herrenschmidt
2005-05-25 22:04 ` Venkatesh Pallipadi
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