From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [Xenomai-core] x86_64 - Initial results. From: Philippe Gerum In-Reply-To: <200702241655.17697.paul_c@domain.hid> References: <200702241526.22786.paul_c@domain.hid> <1172332571.2161.26.camel@domain.hid> <200702241655.17697.paul_c@domain.hid> Content-Type: text/plain Date: Sat, 24 Feb 2007 18:17:43 +0100 Message-Id: <1172337463.2161.37.camel@domain.hid> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: Philippe Gerum Reply-To: rpm@xenomai.org List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paul Cc: xenomai@xenomai.org On Sat, 2007-02-24 at 16:55 +0000, Paul wrote: > On Saturday 24 February 2007 15:56, Philippe Gerum wrote: > > > Initial results look promising with the latency test reporting figures > > > in the 0.5 to 4 uSec range under light load. A kernel compile bumps the > > > wost up to 9-14uSec. > > > > Not bad. Is this a UP or SMP config, and which kind of box did run the > > tests precisely? > > AMD X2 4600+ with SMP config - MoBo is an Asus A8V with a Via K8T800Pro > chipset and a measly 512M of RAM. > Ok. > > > Firing up X,KDE, and a gamut of desktop apps really kills the > > > numbers though - ~267uSec being the worst recorded so far, > > > > Ok, the latter looks clearly pathological. The trace should tell us > > more. > > The latency log ? Rather the CONFIG_IPIPE_TRACE feature, with the IRQs off tracking option set, but the latency log already has some value, thanks. > Attached is some three hours worth of log - Should point out there are no > proprietory video drivers being used, just the regular Xorg stuff and what > ever the kernel provides. > Looking at this log, the good news is that latency peaks are not spread all over the place, but only a few of them are bugging us. This tend to confirm a bad interference exists with something specific to the X startup procedure (maybe/likely? related to the graphic card). Does the peak still occur if you disable hw acceleration for the graphic card in your XF86Config file? > > Regards, Paul. > -- Philippe.