From: Thierry Coutelier <Thierry.Coutelier@linux.lu>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] CBQ or HTP accuracy
Date: Thu, 05 Dec 2002 15:34:45 +0000 [thread overview]
Message-ID: <marc-lartc-103910255021866@msgid-missing> (raw)
In-Reply-To: <marc-lartc-103899971519055@msgid-missing>
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
>
--
Thierry Coutelier /'\ ASCII Ribbon Campaign
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prev parent reply other threads:[~2002-12-05 15:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-04 11:00 [LARTC] CBQ or HTP accuracy Thierry Coutelier
2002-12-04 15:39 ` Stephane Ouellette
2002-12-05 15:34 ` Thierry Coutelier [this message]
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