netdev - Re: bnx2 udp multicast packet loss and jtter

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Date:	Fri, 17 Jun 2011 16:35:58 +0100
From:	Kieran Kunhya <kierank@...encoder.com>
To:	netdev@...r.kernel.org
Subject: Re: bnx2 udp multicast packet loss and jtter

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.
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