netdev - Re: HTB accuracy on 10GbE

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20091104133959.GB8578@ff.dom.local>
Date:	Wed, 4 Nov 2009 13:39:59 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ryousei Takano <ryousei@...il.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	takano-ryousei@...t.go.jp
Subject: Re: HTB accuracy on 10GbE

On 04-11-2009 12:31, Eric Dumazet wrote:
....
> Maybe you can try changing class mtu to 40000 instead of 9000, and quantum to 60000 too
> 
> tc class add dev $DEV parent 1: classid 1:1 htb rate ${rate}mbit mtu 40000 quantum 60000
> 
> (because your tcp stack sends large buffers ( ~ 60000 bytes) as your NIC can offload tcp segmentation)
> 

Hmm..., testing htb scheduling exactness with tso/gso on seems kind of
weather reporting. On the other hand, depending on hardware, these
rates could be available with mtu 9000 and tso/gso off, unless I
miss something. So maybe such a test would be interesting too?
Then I'd suggest this one, erlier mentioned, patch to iproute2:
http://marc.info/?l=linux-netdev&m=124453482324409&w=2

Best 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