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Date:	Wed, 12 Dec 2007 15:13:13 -0800
From:	Stephen Hemminger <>
To:	Ariane Keller <>
Cc:	Patrick McHardy <>,
	Ariane Keller <>,
	Ben Greear <>,,,
	Rainer Baumann <>
Subject: Re: [PATCH 0/2] netem: trace enhancement

On Mon, 10 Dec 2007 15:32:14 +0100
Ariane Keller <> wrote:

> I finally managed to rewrite the netem trace extension to use rtnetlink 
> communication for the data transfer for user space to kernel space.
> The kernel patch is available here:
> and the iproute patch is here:
> Whenever new data is needed the kernel module sends a notification to 
> the user space process. Thereupon the user space process sends a data 
> package to the kernel module.

I wonder if it wouldn't be possible to enhance/extend netlink
to use sendfile/splice to get the data.  It is rather more work than
needed for just this, but it would be useful for large configuration.

> I had to write a new qdisc_notify function (qdisc_notify_pid) since the 
> other was acquiring a lock, which we already hold in this situation.

> I hope everything works as expected and I'm looking forward for your 
> comments.
> Thanks!
> Ariane

Stephen Hemminger <>
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