Hello Michael, I am able to get 63xxMb/s throughput with 10% less cpu utilization when I apply deferring skb patch on top of your most recent vhost patch. The userspace TCP_STREAM BW used to be 3xxxMb/s from upper stream git tree. After applying your recent vhost patch, it goes up to 53xxMb/s. Now it can reach 63xxMb/s, pretty good news. (this test with transmission descriptors = 1K) netperf output with recent vhost patch: [root@localhost ~]# netperf -H 192.168.122.1 -c -C -l60 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.1 (192.168.122.1) port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 60.03 5325.82 99.58 83.33 1.532 2.564 netperf output with vhost + deferring skb allocation patch [root@localhost linux-2.6.32-rc5]# netperf -H 192.168.122.1 -c -C -l60 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.1 (192.168.122.1) port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 60.02 6332.38 99.33 76.16 1.285 1.970 Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
