From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset="us-ascii" From: Kurijn Buys In-Reply-To: <529F69AD.6060003@xenomai.org> Date: Thu, 5 Dec 2013 00:44:56 +0000 Content-Transfer-Encoding: quoted-printable Message-ID: References: <40A5BE95-8E78-4CD6-81D2-C97AA7A58FBB@open.ac.uk> <529DCF2F.1070702@xenomai.org> <1507DF58-4A8D-42E0-92B8-4A9EAB4289E3@open.ac.uk> <529DDB58.3090709@xenomai.org> <5B55252A-19D2-4A0D-82BE-FC77BFA6AEE1@open.ac.uk> <529DFEC3.1050106@xenomai.org> <90F2A7A6-5B5E-4A25-8D9D-3D50D0EC0826@open.ac.uk> <529E2801.5060505@xenomai.org> <529EEB7C.4090308@xenomai.org> <529EED06.4010108@xenomai.org> <529EF58A.8030003@xenomai.org> <529EF680.1040108@xenomai.org> <529EF89E.6000302@xenomai.org> <529EFB3D.6090900@xenomai.org> <529F03FC.8040409@xenomai.org> <529F04DD.2070201@xenomai.org> <529F0C48.20705@xenomai.org> <529F0DBC.9080905@xenomai.org> <529F13A1.5070403@xenomai.org> <529F1913.4030604@xenomai.org> <529F1974.60900@xenomai.org> <529F2BED.2030403@xenomai.org> <529F5254.8060501@xenomai.org> <529F69AD.6060003@xenomai.org> Subject: Re: [Xenomai] latency spikes under load List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Philippe Gerum Cc: Xenomai@xenomai.org Op 4-dec.-2013, om 17:43 heeft Philippe Gerum het volgende geschreven: > On 12/04/2013 05:03 PM, Gilles Chanteperdrix wrote: >> On 12/04/2013 02:19 PM, Philippe Gerum wrote: >>> On 12/04/2013 01:00 PM, Gilles Chanteperdrix wrote: >>>> Ok, could you push the branch somewhere so that I can try it? >>>> >>> >>> testing/ipipe-3.8-i915-fix >> >> I could test it, I no longer get high latencies while moving a large >> opengl window. So, it looks good. I've it running as well (with the priority coupling option disabled this ti= me). The latency test results in a worst value of 52us (no idea if this is = normal, the lat max globally stays between 10 and 30us), but I have no high= er pikes under load in each case... The other test I mentioned before still has a few measurements that occur a= t 10us in stead of 1000us... maybe it's an issue with this test... I have the same oddity as the other time I installed a 3.8 kernel on Ubuntu= 10.04: -the /proc/ipipe files don't look how they should I guess. The Linux file i= s full of lines with "__ipipe_do_IRQ" and near the end a line with "__ipipe= _do_critical_sync"... -the version file only states "1" -the xenomai file mainly has lines with "..." and also this critical sync l= ine near the end. Also, I tried to enable the ipipe tracer but without the "tracing on boot" = option, but I can't get it to work now. When I do "echo < 1 /proc/ipipe/tra= ce/enable" (as root), the flag stays on 0. and the frozen file remains empt= y. >> >> > > Same here. > > -- > Philippe. -- The Open University is incorporated by Royal Charter (RC 000391), an exe= mpt charity in England & Wales and a charity registered in Scotland (SC 038= 302).