From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from ns1.tyldum.com ([91.189.178.231]:33259 "EHLO ns1.tyldum.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756259Ab1LNSXx (ORCPT ); Wed, 14 Dec 2011 13:23:53 -0500 Message-ID: <4EE8E9AD.30002@tyldum.com> Date: Wed, 14 Dec 2011 19:23:41 +0100 From: Vidar Tyldum MIME-Version: 1.0 To: Marko Ristola CC: Linux Media Mailing List Subject: Re: Multiple Mantis devices gives me glitches References: <4EE6FF6F.5050901@kolumbus.fi> <4EE79543.2080802@tyldum.com> <4EE7CA0C.200@kolumbus.fi> In-Reply-To: <4EE7CA0C.200@kolumbus.fi> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: 13.12.2011 22:56, Marko Ristola: > Here is another patch that I wrote for my DVB HDTV network delivery glitches > problem. > It might help you a bit also: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=38e009aac9e02d2c30fd9a5e979ab31433e7d578 I started seeing glitches again after a day, so I decided to give this a go. With 'perf top' I see that the activity dvb_dmxdev_init was somewhat reduced, but I still have some glitches. perf top: 615.00 16.4% dvb_dmxdev_init 380 irqs/sec kernel:49.5% > That patch doesn't guarantee glitch free data delivery either. > Next question is, which buffer overruns now? Mantis 64K DMA buffer? > DVB-CORE's 128K buffer? > VDR reads from DVB-CORE's 128K buffer. I'll keep these two patches running for a while and see how it goes. Things are definately better, but eventually I get glitches. I am unable to locate anything else on the system causing load, but of course, that does not mean there isn't any. Thanks for the help. I'm always open for testing new patches. Sadly I am not capable of diving into the code to help. -- Vidar Tyldum vidar@tyldum.com PGP: 0x3110AA98