Hello Patrick, Please excuse my suggestion if you have already considered the issue I indicate below from Stef's FAQ. : I have measured the performance of HTB with iperf and found it to be : very close to expected (i.e., within 5%). I have a colleague who is : measuring the performance by ftp'ing large files and recording the time : required to make the transfer. He is seeing an average throughput that : is nearly 10% away from the theoretical, with occasional excursions to : nearly 30%. How have you defined your PSCHED_CLOCK_SOURCE? See this URL: http://www.docum.org/stef.coene/qos/faq/cache/40.html : My colleague is now questioning the quality of the traffic control : algorithms and wondering two things: Let's be careful with the baby and the bathwater. The algorithms have been vetted. The implementation may not be ideal, but implementations always suffer from compromises, right? : 1) What tolerance can we guarantee and advertise? Measure the deviations from your specified bandwidth after changing your setting for PSCHED_CLOCK_SOURCE. Advertise your measured tolerance accordingly. : 2) Can the tolerance be improved, since the values he has measured are : unacceptable? I don't know--see the above link, and check how your kernel was compiled. Others on this list may have further suggestions for you. Good luck, -Martin -- Martin A. Brown --- SecurePipe, Inc. --- mabrown@xxxxxxxxxxxxxx _______________________________________________ LARTC mailing list / LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
