Ethy H. Brito wrote:
On Sun, 20 May 2007 22:56:23 +0200
Christian Benvenuti <christian.benvenuti@libero.it> wrote:
Hi,
Hi All
Is there any output that counts the number of dropped bytes
(not packets) just as in "Sent" in "tc -s class" output?
No.
A simple workaround (for simple configurations) consists of redirecting
all the traffic you want to drop to a dedicated class and attach a
blackhole qdisc (i.e., drop everything) to it.
Hmmm. I am pretty sure I did not tell what I meant.
I assume that at some point an HTB class will drop some packets that are
beyond its speed regulation, right?
Not always if it's got a really long queue tcp windows can be absorbed.
You can choose queue length.
I just need to measure this amount of dropped bytes (not packets).
I don't think you can.
With
this measure I can MRTG it and give the clients some felling that they
really need more bandwidth.
That would be a bit deceitful - TCP relies to some extent on dropped
packets, how many you get depends on buffer lengths and number of
connections. You could double the rate with a smaller buffer and see
more dropped packets than a slower link with a bigger buffer.
Andy.
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