From: Stephane Ouellette <ouellettes@videotron.ca>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] CBQ or HTP accuracy
Date: Wed, 04 Dec 2002 15:39:35 +0000 [thread overview]
Message-ID: <marc-lartc-103901647103651@msgid-missing> (raw)
In-Reply-To: <marc-lartc-103899971519055@msgid-missing>
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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next prev parent reply other threads:[~2002-12-04 15:39 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 [this message]
2002-12-05 15:34 ` Thierry Coutelier
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