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). > [EMAIL PROTECTED] ~]# tc qdisc add dev eth2 root tbf rate 2gbit buffer > 5000000 limit 18000 mtu 9000 > > [EMAIL PROTECTED] ~]# ./nuttcp-5.5.5 -w10m 192.168.88.14 > 2465.6729 MB / 10.08 sec = 2051.8241 Mbps 19 %TX 13 %RX > > [EMAIL PROTECTED] ~]# ./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 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
