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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAPoj4et6nv7x1xbcsDRBfA3sCgixS_CLMF_Em9Xryiwgk0JzLA@mail.gmail.com \
--to=09cicada@gmail.com \
--cc=lartc@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).