Ilpo,

On Friday, 25. July 2008 16:06:04 Ilpo Järvinen wrote:

I guess the patch below would be enough in itself to create the desired
effect (though "desired" is hardly a negative enough word to describe a
workaround of this kind). 

Yeah, the result feels good enough for me. Here's the latest tcpdump
before I run out of good filenames for the dumps:
http://www.intra2net.com/de/download/tcpdump/tcp_frto_combined_patch.tar.bz2

Ie., in the worst case 6.8% of your link's capacity was wasted during the
transfer due to inefficiency cause by that middlebox, not counting the
under-utilization that occurs both because of a small window or a wait for
RTOs, not bad result at all... :-D

IIRC our outbound box does traffic shaping, so some percents are to be 
accounted to packets being dropped to slow down the connection a bit 
if they come (in) too fast.

Anyway, we now just have to flip a coin if this gets into the kernel
or not :-) I really hope this could save someone from doing
the same debug session all over again...

Thanks for the hard work you put into debugging this.

Thomas