Re: netem

From: Stephen Hemminger
Date: Wed Mar 08 2006 - 12:08:33 EST


On Wed, 8 Mar 2006 18:10:00 +0100
Luca De Cicco <ldecicco@xxxxxxxxx> wrote:

> Hi there to the list.
>
> I'm using netem in order to generate delays on localhost (doing
> research on TCP and congestion control stuff) but often the kernel
> hangs when setting and resetting the delay.

What kernel version?

If it is UML, you probably could attach to the kernel with gdb and
get a picture of where it got hung.

> One workaround is using UML and defining two taps, but it is an iptables
> hell. Moreover when using UML and pinging I see an RTT which is not
> consistent to what i set (it produce big oscillations in RTT even if i
> didn't set any rtt variance).
>
> Is anyone having such problems? Any workaround or patch to apply?
>
> Thanks in advance,
> Luca De Cicco
>
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