From: Tim Fletcher (tim@fletchmail.net)
Date: Mon May 19 2003 - 12:17:57 GMT-3
Tom,
There is not really any relationship between byte-count and bandwidth. The
byte-count is simply how many bytes to send from the specified queue when
it is serviced. The problem is that the byte-count and packet boundary
rarely coincide, so the queuing process sends the number of bytes specified
in the byte-count, then continues sending until the end of the current
packet. So if you have a byte-count of 3500 and 1500 byte packets, it will
send 3 packets, which comes out to 4500 instead of 3500. You could assume a
packet size of 1500, because that is the MTU of most interfaces, but that
can lead to problems as well. If we use a byte-count of 3000, it will let 2
1500 byte packets through, and we will match our byte count exactly. But if
we have 1400 byte packets, we will let 3 of them through for a byte-count
of 4200.
So unless you know what the typical packet size is for a given queue, you
might be better off using CBWFQ.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt2/qcfconmg.htm#1001203
-Tim Fletcher #11406
At 06:05 PM 5/19/2003 +0900, Tom Young wrote:
>Hi, group
>
> I really confused, I had asked this question for somebody
>but hadn't got answer, it is that want to pay the half
>bandwidth of serial port for dlsw, and 25% for ip , 15%
>for IPX and 10% for the default. That is the answer as
>below.
>
>queue-list 1 protocol dlsw 0
>queue-list 1 protocol ip 1
>queue-list 1 protocol ipx 2
>queue-list 1 default 3
>queue-list 1 queue 0 byte-count 7500
>queue-list 1 queue 1 byte-count 3750
>queue-list 1 queue 2 byte-count 2250
>
>But I think the bandwidth of serial port is 1.5M , that
>1500000bps, is 150000Bps, so, 50% of serial port should be
>75000 not the 7500. So I think the answer should be 75000,
>37500 , 22500, right?
>
>Hope someone could give me a correct answer, thanks alot .
>
>
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