netdev - Re: HTB - What's the minimal value for 'rate' parameter?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4BC63766.5080104@gmail.com>
Date:	Wed, 14 Apr 2010 23:45:10 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Antonio Almeida <vexwek@...il.com>
CC:	netdev@...r.kernel.org, kaber@...sh.net, davem@...emloft.net,
	devik@....cz
Subject: Re: HTB - What's the minimal value for 'rate' parameter?

Antonio Almeida wrote, On 04/14/2010 12:22 PM:

> What do you mean with "1:2 has grandchildren with overflown rate tables"?
> I couldn't understand your idea. Is there any mistake in the
> configuration I sent?
> How would you set rates for this particular example?


class htb 1:1 root rate 1000Mbit ceil 1000Mbit
class htb 1:2 parent 1:1 rate 4096Kbit ceil 4096Kbit
class htb 1:10 parent 1:2 rate 1024Kbit ceil 4096Kbit
class htb 1:11 parent 1:2 rate 1024Kbit ceil 4096Kbit
class htb 1:101 parent 1:10 prio 3 rate 8bit ceil 4096Kbit
class htb 1:111 parent 1:11 prio 3 rate 8bit ceil 4096Kbit

Classes 1:101 and 1:111 have too low rates, which causes wrong (overflowed!)
values in their rate tables, so their rates could be practically
uncontrollable. They are limited by their ceils instead, so something like:

class htb 1:101 parent 1:10 leaf 101: prio 3 rate 4096Kbit ceil 4096Kbit
class htb 1:111 parent 1:11 leaf 111: prio 3 rate 4096Kbit ceil 4096Kbit

But then their guaranteed rates are higher than their parents, and the
sum is higher than grandparent's rate, which means the config is wrong.
(You have to control these sums - HTB doesn't.)

As I wrote before, the minimal (overflow safe) rate depends on max
packet size, and for 1500 byte it would be something around:
1500b/2min, so if your clients can wait so long, try this:

class htb 1:101 parent 1:10 leaf 101: prio 3 rate 100bit ceil 4096Kbit
class htb 1:111 parent 1:11 leaf 111: prio 3 rate 100bit ceil 4096Kbit

Regards,
Jarek P.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html