Could you post your hardware configuration here? Xiantao Scholte van Mast, Rene wrote: > Hello, > I have trouble with the network performance inside my virtual > machines. > > My KVM-Host machine is connected to a 10Gbit Network. All interfaces > are configured to a mtu of 4132. On this host I have no problems and > I can use the full bandwidth: > > # iperf -c 10.10.80.100 -w 65536 -p 12345 -t 60 -P4 > [ ID] Interval Transfer Bandwidth > [ 4] 0.0-60.0 sec 18.8 GBytes 2.69 Gbits/sec > [ 5] 0.0-60.0 sec 15.0 GBytes 2.14 Gbits/sec > [ 6] 0.0-60.0 sec 19.3 GBytes 2.76 Gbits/sec > [ 3] 0.0-60.0 sec 15.1 GBytes 2.16 Gbits/sec > [SUM] 0.0-60.0 sec 68.1 GBytes 9.75 Gbits/sec > > > Inside a virtual machine don't reach this result: > > # iperf -c 10.10.80.100 -w 65536 -p 12345 -t 60 -P 4 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-60.0 sec 5.65 GBytes 808 Mbits/sec > [ 4] 0.0-60.0 sec 5.52 GBytes 790 Mbits/sec > [ 5] 0.0-60.0 sec 5.66 GBytes 811 Mbits/sec > [ 6] 0.0-60.0 sec 5.70 GBytes 816 Mbits/sec > [SUM] 0.0-60.0 sec 22.5 GBytes 3.23 Gbits/sec > > I only can use 3,23Gbits of 10Gbits. I use the virtio driver for all > of my vms, but I have also tried to use the e1000 nic device instead. > > With starting the iperf performance test on multiple vms > simultaneously I can use the full bandwidth of the kvm host's > interface. But only one vm can't use the full bandwith. Is this a > known limitation, or can I improve this performance? > > Does anyone have an idea how I can improve my network performance? > It's very important, because I want to use the network interface to > boot all vms via AOE (ATA over Ethernet). > > If I mount a harddisk via AOE inside a vm I get only this results: > Write |CPU |Rewrite |CPU |Read |CPU > 102440 |10 |51343 |5 |104249 |3 > > On the KVM Host I get those results on a mouted AOE Device: > Write |CPU |Rewrite |CPU |Read |CPU > 205597 |19 |139118 |11 |391316 |11 > > If I mount the AOE Device directly on the kvm-host and put a virtual > harddisk-file in it I got the following results inside a vm using > this harddisk-file: > Write |CPU |Rewrite |CPU |Read |CPU > 175140 |12 |136113 |24 |599989 |29 > > Here more details about my environment: > > KVM Version: > QEMU PC emulator version 0.12.3 (qemu-kvm-0.12.3), Copyright (c) > 2003-2008 Fabrice Bellard > 0.12.3+noroms-0ubuntu9 > > KVM Host Kernel: > 2.6.32-22-server #36-Ubuntu SMP Thu Jun 3 20:38:33 UTC 2010 x86_64 > GNU/Linux > > KVM Host OS: > Distributor ID: Ubuntu > Description: Ubuntu 10.04 LTS > Release: 10.04 > Codename: lucid > > KVM Guest Kernel: > 2.6.32-22-server #36-Ubuntu SMP Thu Jun 3 20:38:33 UTC 2010 x86_64 > GNU/Linux > > KVM Guest OS: > Distributor ID: Ubuntu > Description: Ubuntu 10.04 LTS > Release: 10.04 > Codename: lucid > > I would feel very happy if someone can help to solve my problem! > > Best regards -- To unsubscribe from this list: send the line "unsubscribe kvm-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
