netdev - Re: tbf/htb qdisc limitations

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: <20101015023749.f085006b.billfink@mindspring.com>
Date:	Fri, 15 Oct 2010 02:37:49 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Rick Jones <rick.jones2@...com>,
	Steven Brudenell <steven.brudenell@...il.com>,
	netdev@...r.kernel.org
Subject: Re: tbf/htb qdisc limitations

On Thu, 14 Oct 2010, Jarek Poplawski wrote:

> On Thu, Oct 14, 2010 at 08:09:39AM +0000, Jarek Poplawski wrote:
> > On Thu, Oct 14, 2010 at 03:13:54AM -0400, Bill Fink wrote:
> > > TSO/GSO was disabled and was using 9000-byte jumbo frames
> > > (and specified mtu 9000 to tc command).
> > > 
> > > Here was one attempt I made using tbf:
> > > 
> > > tc qdisc add dev eth2 root handle 1: prio
> > > tc qdisc add dev eth2 parent 1:1 handle 10: tbf rate 8900mbit buffer 1112500 limit 10000 mtu 9000
> > > tc filter add dev eth2 protocol ip parent 1: prio 1 u32 match ip dst 192.168.1.23 flowid 10:1
> > > 
> > > I tried many variations of the above, all without success.
> > 
> > The main problem are smaller packets. If you had (almost) only 9000b
> > frames this probably could work. [...]
> 
> On the other hand, e.g. the limit above seems too low wrt mtu & rate.

Actually, I discovered my commands above work just fine on
a 2.6.35 box:

i7test7% nuttcp -T10 -i1 192.168.1.17
 1045.3125 MB /   1.00 sec = 8768.3573 Mbps     0 retrans
 1045.6875 MB /   1.00 sec = 8772.0292 Mbps     0 retrans
 1049.5625 MB /   1.00 sec = 8804.2627 Mbps     0 retrans
 1043.1875 MB /   1.00 sec = 8750.9960 Mbps     0 retrans
 1048.6875 MB /   1.00 sec = 8796.3246 Mbps     0 retrans
 1033.4375 MB /   1.00 sec = 8669.3188 Mbps     0 retrans
 1040.7500 MB /   1.00 sec = 8730.7057 Mbps     0 retrans
 1047.0000 MB /   1.00 sec = 8783.2063 Mbps     0 retrans
 1040.0000 MB /   1.00 sec = 8724.0564 Mbps     0 retrans
 1037.4375 MB /   1.00 sec = 8702.5434 Mbps     0 retrans

10431.5608 MB /  10.00 sec = 8749.7542 Mbps 25 %TX 35 %RX 0 retrans 0.11 msRTT

The problems I encountered were on a field system running
2.6.30.10.  I will investigate upgrading the field system
to 2.6.35.

					-Bill
--
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