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Created attachment 500390 [details] VM reports 1G on 10G public bridge Description of problem: Windows VM which is operating on 10G public bridge reports 1G and throughput is below 1G. Following are results of e1000/virtio nic driver throughput on 10G public bridge from guest to external guest . virtio-throughput (avg-3) e1000-throughput (avg-3) 2K-S 92.44 94.25 4K-S 176.31 184.28 8K-S 276.33 339.14 16K-S 364.87 601.87 32K-S 562.73 858.64 64K-S 681.19 917.75 128K-S 855.69 1163.76 256K-S 932.39 1176.07 2K-R 79.84 77.98 4K-R 177.03 184.28 8K-R 277.01 339.57 16K-R 365.3 601.02 32K-R 563.33 859.34 64K-R 681.39 918.61 128K-R 875.12 1163.63 256K-R 941.53 1178.32 Version-Release number of selected component (if applicable): virtio-win-1.0.1-3.52454.el5 kernel-2.6.18-259.el5 kvm-83-232.el5 How reproducible: 100% Steps to Reproduce: 1.boot guest on host /usr/libexec/qemu-kvm -name 'vm1' -drive file=/root/windows-2k8-r2-sp1-raw-ide,index=0,if=virtio,boot=on,media=disk,cache=none,format=raw -net nic,vlan=0,model=virtio,macaddr='9a:3b:dd:52:d9:d7' -net tap,vlan=0,script=/etc/qemu-ifup -m 4096 -smp 2,cores=1,threads=1,sockets=2 -cpu qemu64,+sse2 -vnc :0 -rtc-td-hack -boot c -usbdevice tablet -no-kvm-pit-reinjection 2.boot guest on external host /usr/libexec/qemu-kvm -name 'vm1' -drive file=/root/windows-2k8-r2-sp1-raw-ide,index=0,if=virtio,boot=on,media=disk,cache=none,format=raw -net nic,vlan=0,model=virtio,macaddr='9a:3b:dd:52:d9:d8' -net tap,vlan=0,script=/etc/qemu-ifup -m 4096 -smp 2,cores=1,threads=1,sockets=2 -cpu qemu64,+sse2 -vnc :0 -rtc-td-hack -boot c -usbdevice tablet -no-kvm-pit-reinjection 3.run ntttcp-server command on external guest run c:\Program Files (x86)\Misrosoft COrporation\NT Testing TCP\Tool\ for %i in (256k,256k,256k,256k,256k,256k,256k,256k)do NTttcpr.exe -m 1,0,192.168.0.12 -a 6 -rb %i >>received.1.txt 4.run ntttcp-client command on guest run c:\Program Files (x86)\Misrosoft COrporation\NT Testing TCP\Tool\ for %i in (2k,4k,8k,16k,32k,64k,128k,256k)do NTttcps.exe -m 1,0,192.168.0.12 -a 2 -l %i >>send.1.txt Actual results: Expected results: Additional info: #ethtool -k eth2 Offload parameters for eth2: Cannot get device udp large send offload settings: Operation not supported rx-checksumming: on tx-checksumming: on scatter-gather: on tcp segmentation offload: off udp fragmentation offload: off generic segmentation offload: on generic-receive-offload: on #ethtool -k breth0 Offload parameters for breth0: Cannot get device rx csum settings: Operation not supported Cannot get device udp large send offload settings: Operation not supported rx-checksumming: off tx-checksumming: on scatter-gather: on tcp segmentation offload: on udp fragmentation offload: off generic segmentation offload: on generic-receive-offload: off #ethtool -i eth2 driver: ixgbe version: 3.2.9-k2 firmware-version: 0.9-3 bus-info: 0000:0f:00. #brctl show bridge name bridge id STP enabled interfaces breth0 8000.001b218eb2b8 no tap0 eth2
Do the same test with scenarios guest to guest (on same host) and guest to exguest.From that two scenarios, throughput could be reached over 1Gb with 256k message size. After checking again the raw data for rhel6.1 ,I have to revise my results for rhel6.1 in comment 2 .in comment 2, it shows the throughput for total of 3 iterations.I have averaged it in the following "comparison" part. version: kernel-2.6.18-262.el5 kvm-83-235.el5 win2k8 r2 sp1 guest with virtio-win-prewhql-0.1-10 comparison: message | rhel5.7 host | rhel5.7 host | rhel6.1 host | size | guest -> guest | guest -> exguest | guest ->exguest | --------+----------------+------------------+ -----------------+ 2K-S 98.59 91.42 96.17 4K-S 192.65 173.91 174.69 8K-S 309.29 268.44 324.66 16K-S 420.84 354.78 517.69 32K-S 624.91 557.79 766.56 64K-S 767.74 694.31 1023.9 128K-S 916.59 979.03 1284.5 256K-S 1066.32 1098.36 1396.95 2K-R 94.75 70.69 85.34 4K-R 191.23 172.5 174.95 8K-R 307.4 267.13 324.65 16K-R 419.84 353.67 517.69 32K-R 624.56 555.57 767.1 64K-R 767.51 692.55 1023.93 128K-R 916.1 976.26 1283.75 256K-R 1064.23 1095.73 1395.78
Two additional questions: Do you have the results of "guest->guest" with rhel6.1 host? And do you have results for "host->host2 (exguest host)"?
(In reply to comment #13) > Two additional questions: > Do you have the results of "guest->guest" with rhel6.1 host? > And do you have results for "host->host2 (exguest host)"? No, we don't have .
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
Closing this RHEL5 bug. We are focusing on network performance for RHEL6.3, and soon we would like to test its performance.