From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai@xenomai.org, Stuart O Anderson <soa@domain.hid>
Subject: Re: [Xenomai-help] Known-to-work motherboards?
Date: Thu, 12 Feb 2009 23:27:45 +0100 [thread overview]
Message-ID: <4994A261.5050003@domain.hid> (raw)
In-Reply-To: <4994A180.3020102@domain.hid>
Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Jan Kiszka wrote:
>>> Gilles Chanteperdrix wrote:
>>>> Stuart O Anderson wrote:
>>>>> If there isn't a list online that I've missed, is anyone running
>>>>> xenomai on a relatively recent machine with 8 or more cores without
>>>>> problems? If so, can you provide hardware specs?
>>>> Xenomai will have scalability problems when running on an 8 cores system
>>>> (if you intend to run real-time tasks on each of the 8 cores).
>>>>
>>> We are running Xenomai on up to 4x4 boxes, but only with 1 or 2 cores
>>> used by RT tasks. I've some patch hanging around that restricts Xenomai
>>> (specifically its host timer hook) to a CPU subset in order to mitigate
>>> the scalability issues - guess I should finally get it in shape and post it.
>> The host timer already runs on only one CPU.
>
> Not on x86.
Some time ago, when using the APIC (which was always the case on x86
SMP), the host timer was not even started, and the Linux APIC irqs were
triggered by a custom 8254 irq handler. Well, it seems things have
changed since then...
--
Gilles.
next prev parent reply other threads:[~2009-02-12 22:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-12 17:04 [Xenomai-help] Known-to-work motherboards? Stuart O Anderson
2009-02-12 20:05 ` Gilles Chanteperdrix
2009-02-12 21:02 ` Jan Kiszka
2009-02-12 22:10 ` Gilles Chanteperdrix
2009-02-12 22:24 ` Jan Kiszka
2009-02-12 22:27 ` Gilles Chanteperdrix [this message]
2009-02-12 22:59 ` Jan Kiszka
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