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

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Message-Id: <20070904134015.18a3e7ca.billfink@mindspring.com>
Date:	Tue, 4 Sep 2007 13:40:15 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>, jdb@...x.dk,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2]: [NET_SCHED]: Make all rate based scheduler work
 with TSO.

On Tue, 04 Sep 2007, Patrick McHardy wrote:

> Bill Fink wrote:
> > On Sat, 1 Sep 2007, Jesper Dangaard Brouer wrote:
> >
> >>On Sat, 1 Sep 2007, Patrick McHardy wrote:
> >>>
> >>>It still won't work properly with TSO (TBF for example already drops
> >>>oversized packets during ->enqueue), but its a good cleanup anyway.
> >>
> >>Then lets call it a cleanup of the L2T macros.  In the next step we will 
> >>fix the different schedulers, to use the ability to lookup larger sized 
> >>packets. (I did notice the TBF scheduler would drop oversized packets).
> > 
> > Hmmm.  I guess this is also why TBF doesn't seem to work with 9000 byte
> > jumbo frames.
> > 
> > [root@...g4 ~]# tc qdisc add dev eth2 root tbf rate 2gbit buffer 5000000 limit 18000
> 
> 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.

[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

						-Bill
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