netdev - Re: bnx2 udp multicast packet loss and jtter

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Message-ID: <1308324641.3539.1.camel@edumazet-laptop>
Date:	Fri, 17 Jun 2011 17:30:41 +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 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 ?



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