I already tried it and it does not improve much the behaviour. With which parameters should I play in HTB and CBQ ? Stephane Ouellette wrote:
Thierry Coutelier wrote: > > > Hello, > > I am rate limiting traffic going to some IP addresses using CBQ > (and want to change to HTB sometime). > > While testing with different packet sizes I found out that I could go > above the > rate limit I set. (even with HTB) > > The values I use are: rate: 768kbit weight 77kbit allot 10000 avpkt 1512 > I did not change the cell or other parameters. > My root qdisc is set to 40MBit. > > With those values I am able to go up to 840kbit/s with packets sizes > of 612 or 1224. > With other values it's less except for very low values. > > Changing the allot value (If I understood well allot*weight=max > packets per round) > it only gets worst (tested with 1000 and 50000). > > AVPKT is only used for maxidle so it should not change anything ? > > What values should I tweak to have the max rate never exeeded and > still be able > to come very near my max-rate using 1460 bytes packets ? > > Would HTB be more accruate ? > > > Thanks for the HELP. > Thierry, to my knowledge, HTB is more predictable than CBQ and easier to set up. If you want more accuracy, I suggest you modify a file in the kernel source: include/net/pkt_sched.h Change the #define for PSCHED_CLOCK_SOURCE from PSCHED_JIFFIES to PSCHED_CPU. I've read this suggestion on the list but never tried it yet. Note that this is valid only for CPUs that support a TSC (Pentium and up). Regards, Stephane
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