> Is the network path you are downloading across reasonably idle so that you > get reproducible results between runs?
Also tested with netperf (to local host) now. Results in short (performance in Mbit/sec): vhost=off,cores=1: 3982 vhost=off,cores=2: 3930 vhost=off,cores=4: 3912 vhost=on,cores=1: 22065 vhost=on,cores=2: 1392 vhost=on,cores=4: 532 As you can see, vhost performance drops from 22065 to 532 - this is by factor 40! And ideas? -- complete logs--- With vhost=off / cores=1 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 3982.74 With vhost=off / cores=2 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 3930.62 With vhost=off / cores=4 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 3912.36 With vhost=on /cores=1 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 22065.48 With vhost=on /cores=2 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.01 1392.61 With vhost=on /cores=4 # netperf -H maui TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to maui.maurer-it.com (192.168.2.2) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.05 532.31
