netdev - Re: bnx2 udp multicast packet loss and jtter

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Message-ID: <1308329718.3539.22.camel@edumazet-laptop>
Date:	Fri, 17 Jun 2011 18:55:18 +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 17:42 +0100, Kieran Kunhya a écrit :

> The analyzer can either use the RTP definition of jitter, or it uses
> its own algorithm to attempt to
> mimic the RTP definition of jitter when using TS packets in UDP by
> using the continuity counter.
> This happens with both UDP and RTP streams. (though for unrelated
> reasons UDP is usually used)
> 
> The analyzer is on a different machine. The UDP thread isn't bottlenecked at all
> and the machine is only under moderate load. It also happens with many
> different applications
> that can serve mpegts files.

Quite frankly, I cant believe your bnx2 can be responsible of jitters
like that. By the way, check you're on full duplex mode, not on half
duplex.

You could take a tcpdump on the sender machine, to check if delays are
on this machine, or later in your network (a congestioned egress
somewhere)



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