From: George Anzinger <george@mvista.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: Nick Piggin <piggin@cyberone.com.au>,
Guillaume Foliard <guifo@wanadoo.fr>,
linux-kernel@vger.kernel.org
Subject: Re: Scheduler degradation since 2.5.66
Date: Mon, 15 Dec 2003 23:45:48 -0800 [thread overview]
Message-ID: <3FDEB82C.80908@mvista.com> (raw)
In-Reply-To: <20031216005251.GB3364@mail.shareable.org>
Jamie Lokier wrote:
> George Anzinger wrote:
>
>>Try running the test with a requested sleep time of something less than
>>0.999849 ms. All this is for the x86 which is using this time to do the
>>best it can with the PIT which can only get this close to 1 ms ticks. You
>>can even vary this number to see exactly where the round up actually
>>happens. Ah, life in the nano world :)
>
>
> Would it be better to program the PIT for lowest frequency that's >= 1.0ms.
Possibly. I haven't attempted to analize it. I do know it would make some of
the math a bear. Integers like to round down (read truncate) so... But then,
what we have isn't exactly fun :)
--
George Anzinger george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
next prev parent reply other threads:[~2003-12-16 7:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-14 19:48 Scheduler degradation since 2.5.66 Guillaume Foliard
2003-12-15 2:45 ` Nick Piggin
2003-12-15 4:18 ` Nick Piggin
2003-12-16 0:39 ` George Anzinger
2003-12-16 0:52 ` Jamie Lokier
2003-12-16 7:45 ` George Anzinger [this message]
2004-01-15 0:43 ` Bill Davidsen
2004-01-15 3:36 ` George Anzinger
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