[Fwd: failure notice]

[Jonathan Larmour <jlarmour@redhat.com>]

I've been getting a fair number of bounces recently with this problem. Any
ideas why? As far as I know, there's nothing special about this mail as
opposed to any of the many others I send to the eCos list.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine


To : jlarmour at redhat dot com
Subject : failure notice
From : MAILER-DAEMON at sourceware dot cygnus dot com
Date : 23 Apr 2001 00:29:30 -0000

Hi. This is the qmail-send program at sourceware.cygnus.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<ecos-discuss@sources.redhat.com>:
ezmlm-send: fatal: message already has a Mailing-List header (maybe I should be a sublist) (#5.7.2)

--- Below this line is a copy of the message.

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Date: Fri, 20 Apr 2001 10:23:21 +0100
From: Jonathan Larmour <jlarmour@redhat.com>
Organization: Red Hat UK Ltd.
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To: Andrea Acquaviva <aacquaviva@deis.unibo.it>
Cc: "ecos-discuss@sources.redhat.com" <ecos-discuss@sources.redhat.com>
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Subject: Re: [ECOS]thread switch frequency
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 zhongtao@mail.sc.cninfo.net

Andrea Acquaviva wrote:
> 
> Hi,
> I have a question about eCos mlqueue scheduler.
> If there are two threads (making a matrix multiplication), running with
> the same priority, they switch with a frequency given by:
> 
> f_clock/CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS,
> 
> where f_clock in the case of strongarm1110 (assabet) is 3.6864MHz.
> 
> Is this correct or is there something else that affects the switching
> frequency?

The timer that drives the kernel clock interrupt is at 3.6864MHz yes, but
it is has been programmed to only actually interrupt when its counter
reaches 36864, which corresponds to every 10ms. And only 1 in
CYGNUM_KERNEL_SCHED_TIMESLICE_TICKS of those causes a timeslice.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine