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From: Patrick McHardy <kaber@trash.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] netem with prio hangs on duplicate
Date: Sun, 03 Apr 2005 14:03:50 +0000	[thread overview]
Message-ID: <424FF7C6.4020303@trash.net> (raw)
In-Reply-To: <20050330180504.75838.qmail@web41523.mail.yahoo.com>

js si wrote:
> hi
> 
> i tried the example given on the examples page to
> duplicate selected traffic like
> 
> tc qdisc add dev eth0 root handle 1: prio
> tc qdisc add dev eth0 parent 1:3 handle 3: netem
> duplicate 40% 
> tc filter add dev eth0 protocol ip parent 1:0 prio 3
> u32 match ip dst 11.0.2.2 flowid 1:3
> 
> when i ping from 11.0.2.2 to this interface my machine
> hangs. the same thing works for drop or delay. 
> 
> i would appreciate if someone can tell me what i am
> doing wrong.

Using netem with an upper qdisc screws up the upper qdisc's
q.qlen counter and qdisc_run() tries to dequeue it indefinitely.
I don't know whether netem is intended to be useable only as
top-level qdisc, if so it should make sure that it really is
used this way to avoid hanging the system.

Regards
Patrick
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  reply	other threads:[~2005-04-03 14:03 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-30 18:05 [LARTC] netem with prio hangs on duplicate js si
2005-04-03 14:03 ` Patrick McHardy [this message]
2005-04-04 18:00 ` Stephen Hemminger

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