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Date: Fri, 17 Jun 2011 17:52:44 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Kieran Kunhya <kierank@...encoder.com> Cc: netdev@...r.kernel.org Subject: Re: bnx2 udp multicast packet loss and jtter Le vendredi 17 juin 2011 à 16:35 +0100, Kieran Kunhya a écrit : > On Fri, Jun 17, 2011 at 4:30 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > > > > Le samedi 11 juin 2011 à 15:32 +0100, Kieran Kunhya a écrit : > > > Hello, > > > > > > I get some bad packet loss and high jitter on a BCM5709. This is on > > > kernel 2.6.38-8 - unfortunately using a newer kernel isn't an option > > > right now. > > > The bnx2 driver is version v2.0.23b. > > > > > > I've tried a lot of kenel types such as -lowlatency, -ck and vanilla. > > > The thread doing the udp output is at realtime priority and the same > > > thing happens with different applications. > > > > > > Example of jitter > > > http://dl.dropbox.com/u/2701213/jitter.png > > > > > > Is there anything I can do to further diagnose this problem? > > > > > > > Hi > > > > How is this jitter measured ? > > > > Is the link otherwise idle, or do you have a particular qdisc setup to > > make sure packets from other flow wont have an effect ? > > Thanks for the reply. > The jitter is measured with an IPTV analyser. There are other devices > on the same switch which don't have any jitter issues. > The link is otherwise idle. jitter has a precise meaning in RTP flows. Is this IPTV analyser using this definition ? Is this analyser running on the machine that sends frames, or another machine ? Are you sure the realtime thread fullfill its requirements ? (RT priority wont help if this thread is cpu bounded) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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