From: Marian Jancar <marian.jancar@infonet.cz>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] rate precision of CBQ
Date: Tue, 17 Jul 2001 09:16:45 +0000 [thread overview]
Message-ID: <marc-lartc-99536150822631@msgid-missing> (raw)
In-Reply-To: <marc-lartc-99535118526106@msgid-missing>
Franck BALAZOT wrote:
>Hi all,
>
>I have managed some CBQ class like :
>
>tc class add dev eth0 parent 10:1 classid 10:100 cbq bandwidth 1920KBit
>rate 784 KBit allot 1514 weight 1 Kbit prio 8 maxburst 20 avpkt 1000
>bounded
>
>It works fine, but I noticed that the rate precision is not very good
>(despite the bounded parameter) :
>
>784 kBit => 96 KBytes/s (theoric) but 130-140 KBytes/s in reality
>512 kBit => 64 KBytes/s (theoric) but 80-90 KBytes/s in reality
>256 kBit => 32 KBytes/s (theoric) but 33-34 KBytes/s in reality
>
>At low rate (< 256k), it seems good but not at higher rate.
>
>
>Is this problem coming from my parameters (weight, prio, ...) or is it a
>known problem with CBQ ?
>
Try using tbf or something as a leaf qdisc.
Marian Jancar
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prev parent reply other threads:[~2001-07-17 9:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-17 6:25 [LARTC] rate precision of CBQ Franck BALAZOT
2001-07-17 9:16 ` Marian Jancar [this message]
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