From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4C692FC3.5040802@domain.hid> Date: Mon, 16 Aug 2010 14:32:03 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <1281709057.650414331@domain.hid> <4C65583D.3030800@domain.hid> <1281960823.030215299@domain.hid> In-Reply-To: <1281960823.030215299@domain.hid> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] Very high latencies under stress testing List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: edward.robbins@domain.hid Cc: xenomai@xenomai.org edward.robbins@domain.hid wrote: > > On Friday, 13 August, 2010 3:35pm, "Gilles Chanteperdrix" said: > >> edward.robbins@domain.hid wrote: >>> I wonder if this is to do with graphics? I have set "NoAccel" in the >>> driver section of Xorg.conf (I am using fbdev). I also notice that >>> latencies go massive (e.g. 4200uS) the first time I run glxgears. >>> "glxinfo" reports "Direct rendering: no". >> This is bad news. It could come either from the fact that the Xorg >> driver shuts hardware interrupts off (there is nothing xenomai can do >> about that), or it could be an SMI issue. What about using the driver >> for the real graphic card you have ? Probably intel card? Do you observe >> any big latencies if you stress the system with anything else than X? >> >>> Power management options (ACPUI, APM): Disable ACPI (Advanced >>> Configuration and Power Interface) Support --> Processor Disable CPU >>> Frequency Scaling Disable CPU idle PM support Disable Power Managment >>> Support >> Disabling ACPI is a bad idea. As repeated many times, only >> ACPI_PROCESSOR should be disabled, not ACPI. >> > > Thanks for your helpful responses. > > I'm not working on this project again until next week, but on Friday I was able to > > o Recompile the kernel with ACPI enabled > o Boot with the 'SMI handler' BIOS option set to disabled.... > according to the help text this option should be disabled if 'an RTOS > is installed' - I presume this means that SMIs are completely disabled > and therefore SMIs cannot be the source of the problem > (very convenient BIOS option... now I begin to appreciate the expense of this board!) > o Changed xorg to use the intel video driver Now you can try NoAccel with the intel video driver too.... -- Gilles.