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:
http://www.tcn.hypert.net/tcn_kernel_2_6_23_rtnetlink
and the iproute patch is here:
http://www.tcn.hypert.net/tcn_iproute2_2_6_23_rtnetlink
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 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
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