On Sat, 1 Sep 2007, Jesper Dangaard Brouer wrote:
> On Sat, 1 Sep 2007, Patrick McHardy wrote:
>
> > Jesper Dangaard Brouer wrote:
> >> commit 6fdc0f061be94f5e297650961360fb7a9d1cc85d
> >> Author: Jesper Dangaard Brouer <[EMAIL PROTECTED]>
> >> Date: Thu Aug 30 17:53:42 2007 +0200
> >>
> >> [NET_SCHED]: Make all rate based scheduler work with TSO.
> >>
> >> Change L2T (length to time) macros, in all rate based schedulers, to
> >> call a common function qdisc_l2t() that does the rate table lookup.
> >> This function handles if the packet size lookup is larger than the
> >> rate table, which often occurs with TSO enabled.
> >
> >
> > 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.
[EMAIL PROTECTED] ~]# tc qdisc add dev eth2 root tbf rate 2gbit buffer 5000000
limit 18000
[EMAIL PROTECTED] ~]# tc qdisc show
qdisc pfifo_fast 0: dev eth0 root bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1
1 1 1 1 1
qdisc tbf 8002: dev eth2 rate 2000Mbit burst 5000000b lat 4.3s
With 9000 byte jumbo frames:
[EMAIL PROTECTED] ~]# ./nuttcp-5.5.5 -w10m 192.168.88.14
0.0000 MB / 5.00 sec = 0.0000 Mbps 0 %TX 0 %RX
But reducing the MSS to 1460 to emulate a standard 1500 byte Ethernet MTU:
[EMAIL PROTECTED] ~]# ./nuttcp-5.5.5 -M1460 -w10m 192.168.88.14
2335.7048 MB / 10.05 sec = 1950.3419 Mbps 62 %TX 22 %RX
This is on a 2.6.20.7 kernel.
-Bill
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