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From: Joe Jones <09cicada@gmail.com>
To: lartc@vger.kernel.org
Subject: How to calculate proper Quantum with HTB
Date: Mon, 01 Jul 2019 23:32:36 +0000	[thread overview]
Message-ID: <CAPoj4et6nv7x1xbcsDRBfA3sCgixS_CLMF_Em9Xryiwgk0JzLA@mail.gmail.com> (raw)

Hello,

I am limiting egress traffic to 30Mbps (30mbit) using hbt with a leaf
class for port 22.

tc class add dev eth0 parent 20: classid 20:20 htb rate 30mbit ceil
32mbit prio 1

This all works as expected but I do see some messages in the log
during heavy traffic pasted below.

"HTB: quantum of class 100020 is big. Consider r2q change."

From what I have read the quantum is calculated as (rate in bytes per
sec / r2q-default 10).
In my case 30mbit (30000000/8) / 10 = 375000 (3mbit). The reported
quantum is significantly less but still receive the error in the
kernel log.
I read that the quantum is only used when >limit and <ceil. I am most
definitely at ceiling at all times as I pass heavy traffic.

So questions.
Is there a right way to calculate the correct quantum?
Are the kernel messages I am seeing indicative of a problem that I
should be concened with?

Thanks

next             reply	other threads:[~2019-07-01 23:32 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-01 23:32 Joe Jones [this message]
2019-07-02  0:14 ` How to calculate proper Quantum with HTB Joe Jones

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