From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4994A261.5050003@domain.hid> Date: Thu, 12 Feb 2009 23:27:45 +0100 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <7ed3bc8b0902120904r800de72q97e694001600051e@domain.hid> <499480EE.3040403@domain.hid> <49948E51.9000509@domain.hid> <49949E48.4010106@domain.hid> <4994A180.3020102@domain.hid> In-Reply-To: <4994A180.3020102@domain.hid> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] Known-to-work motherboards? List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: xenomai@xenomai.org, Stuart O Anderson 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.