netdev - Re: [PATCH 1/2]: [NET_SCHED]: Make all rate based scheduler work with TSO.

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Date:	Wed, 05 Sep 2007 11:17:10 +0200
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	Bill Fink <billfink@...dspring.com>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/2]: [NET_SCHED]: Make all rate based scheduler work
	with TSO.

On Tue, 2007-09-04 at 13:40 -0400, Bill Fink wrote:
> On Tue, 04 Sep 2007, Patrick McHardy wrote:
> 
> > Bill Fink wrote:
> > > On Sat, 1 Sep 2007, Jesper Dangaard Brouer wrote:
> > >
> > Yes, you need to specify the MTU on the command line for
> > jumbo frames.
> 
> Thanks!  Works much better now, although it does slightly exceed
> the specified rate.

Thats what happens, with the current rate table system, as we use the
lower boundry (when doing the packet to time lookups). Especially with a
high MTU, as the "resolution" of the rate table diminish (mpu=9000 gives
cell_log=6, 2^6=64 bytes "resolution" buckets).

> [root@...g4 ~]# tc qdisc add dev eth2 root tbf rate 2gbit buffer 5000000 limit 18000 mtu 9000
> 
> [root@...g4 ~]# ./nuttcp-5.5.5 -w10m 192.168.88.14
>  2465.6729 MB /  10.08 sec = 2051.8241 Mbps 19 %TX 13 %RX
> 
> [root@...g4 ~]# ./nuttcp-5.5.5 -M1460 -w10m 192.168.88.14
>  2785.5000 MB /  10.00 sec = 2335.6569 Mbps 100 %TX 26 %RX

BTW, thats a fast connection you are having! :-)

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network developer
  Cand. Scient Datalog / MSc.
  Author of http://adsl-optimizer.dk
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