I have done a few tests with delay / loss, in particular the instances specified on http://linux-net.osdl.org/index.php/DCCP_Testing#Regression_testing Without delay/loss, I get line speed (92.0 Mbps from e100 to e1000, 95.0 Mbps from e1000 to e100). This was for t=10 seconds; the following test runs were all done for t = 20 seconds. 1) Light Loss (40 msec RTT, 1 %loss) ------------------------------------ * calculated value: 3.20 Mbps (s = 1424) * Test runs: 3.21 Mbps, 3.19 Mbps, 3.18 Mbps 2) Heavy Loss (150 msec RTT, 10 %loss) -------------------------------------- * calculated value: 134.34 Kbps * test runs: (a) with a FIFO length of 1000 at the bridge 209 Kbps, 186 Kbps, 182 Kbps (b) with a FIFO length of 10,000 at the bridge 197 Kbps, 176 Kbps, 134 Kbps (I am using different FIFO length since I know from experience that otherwise the bridge can also incur loss.) ==> I actually have a question here, regarding the variability. I am setting the same loss in either direction, i.e. on the bridge I do tc qdisc add dev eth0 root netem delay 75ms loss 10% tc qdisc add dev eth1 root netem delay 75ms loss 10% I note that on http://linux-net.osdl.org/index.php/DCCP_Testing#Network_emulation_setup different loss values for forward/return are used. Has anyone further experience with this? I wonder if feedback loss has heavier implications than forward loss? Script I used: http://www.erg.abdn.ac.uk/users/gerrit/dccp/testing_dccp/tfrc_test.tc - To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
