From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <50144E93.5050109@xenomai.org> Date: Sat, 28 Jul 2012 22:41:55 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <500FEB0F.9000308@xenomai.org> <201207282127.33575.paul_c@tuxcnc.org> In-Reply-To: <201207282127.33575.paul_c@tuxcnc.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai] Heads up: I-pipe patch status on ARM List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paul Cc: "xenomai@xenomai.org" On 07/28/2012 10:27 PM, Paul wrote: > > Thanks for the timely update Gilles - Just finished work on an > (unsupported) ARM1176 SoC running at 700MHz and the documents came in > handy. Only a rough draft at the moment and some of the kernel options > need tuning, but as a starting point, it looks quite reasonable. > > Running a 3.2.21 kernel and Xenomai-2.6.1, graphed the latency test over > a 60 minute run. It does not look that bad. However, "dohell 3600" does not do much. If you want to improve the latencies, use "-p 100" instead of "-p 1000" ;-) How do you get the fancy grid with gnuplot? We could add the option to scripts/histo.gp. Note that I prefer to draw graphs with a log scale, I find they are more meanningful, otherwise, you do not really see how the graph ends. > Look forward to testing a 3.4 series kernel to see if > the results can be improved upon. I am running some tests on omap3 and omap4, so far with not much success. My next try will be to simply disable CONFIG_MULTI_IRQ_HANDLER and the irq domains, to see if I can get the same latencies as 3.2 > > Regards, Paul. > > > > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: latency-t0.png > Type: image/png > Size: 5702 bytes > Desc: not available > URL: > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: latency-t1.png > Type: image/png > Size: 5423 bytes > Desc: not available > URL: > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: latency-t2.png > Type: image/png > Size: 5224 bytes > Desc: not available > URL: > _______________________________________________ > Xenomai mailing list > Xenomai@xenomai.org > http://www.xenomai.org/mailman/listinfo/xenomai > -- Gilles.