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From: Yang Su <ysu@inf.ethz.ch>
To: lartc@vger.kernel.org
Subject: [LARTC] Problem with the tc statistcis
Date: Sat, 26 May 2007 08:29:42 +0000	[thread overview]
Message-ID: <4657EFF6.2070702@inf.ethz.ch> (raw)

I had a linux wireless router. I would like to monitor the queue lengh
of the wireless interface. By default, the wifi0 interface is with
pfifo_fast qdisc which does not report backlog packet. I replaced
pfifo_fast with pfifo:
'tc qdisc replace dev wifi0 root pfifo'
Then I use iperf to send UDP pkts faster than the interface can handle
but when I read the qdisc, the result is like:

qdisc pfifo 8007: limit 10p
Sent 46249560 bytes 30600 pkts (dropped 0, overlimits 0)

It is really strange, because over 80% of packets lost is observed by
application layer but by qdisc, there is no packet dropped at all and no
backlog. Any hints for this result?

Thank you,

Yang Su
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                 reply	other threads:[~2007-05-26  8:29 UTC|newest]

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