Re: What queues/buffers does tc-netem use?

Hello Hagen,

Could you please give me some example of such a tc command that would tell me the statistics? I am not sure what you mean.

Is there a way I can manipulate the internal rbtree queue size, please?

Thank you

Petr MOTEJLEK
________________________________________
From: Hagen Paul Pfeifer <redacted>
Sent: Thursday, July 16, 2015 2:42 PM
To: netdev@vger.kernel.org; Motejlek, Petr
Cc: netem@osdl.org
Subject: Re: What queues/buffers does tc-netem use?

On July 16, 2015 at 1:28 PM "Motejlek, Petr" [off-list ref]
wrote:

I was wondering what queues/buffers does netem use and how does one
control or monitor them?

netem uses his own rbtree based queue. You can use tc(1) to get
statistics.

I could not find this information anywhere and I am not that good in
reading the sources to be able to tell enough about this :) If we talk
only about the situation where netem is the root qdisc for a particular
interface, I would imagine it might be using the txqueue of that
interface, but I am not sure if that's really the case...

Saddly there is no netem implementation documentation, but the source code
is straightforward. You may take a look:

http://lxr.free-electrons.com/source/net/sched/sch_netem.c

Cheers, Hagen