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Diffstat (limited to 'results/scraper/launchpad-without-comments/1066055')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1066055 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1066055 b/results/scraper/launchpad-without-comments/1066055 new file mode 100644 index 000000000..e0cc9f208 --- /dev/null +++ b/results/scraper/launchpad-without-comments/1066055 @@ -0,0 +1,19 @@ +Network performance regression with vde_switch + +I've noticed a significant network performance regression when using vde_switch, starting about one week ago (10/05/2012); before that date, I used to get about 1.5 Gbits host to guest, but now I can only get about 320 Mbits; I didn't find any modification in net/vde.*, just in hw/virtio*. + +My command line: + qemu-system-i386 -cdrom /bpd/bpd.iso -m 512 -boot d -enable-kvm \ + -localtime -ctrl-grab -usbdevice tablet \ + -device virtio-net-pci,mac=52:54:00:18:01:01,netdev=vde0,tx=bh,ioeventfd=on,x-txburst=32 \ + -netdev vde,id=vde0 -vga std -tb-size 2M -cpu host -clock unix + +My host runs a kernel 3.6.1 and my guest runs a kernel 3.5.4; the same problem happens with other host and guest versions, too. + +I know there are better ways of running a guest, but using vde I get a cleaner environment in the host (just one tun/tap interface to manage...), which is quite good when running some accademic experiments. + +Interestingly, at the same time I've noticed a performance enhancement of about 25~30 % when using a tun/tap interface, bridged or not. + +Thank you, very much. + +Edivaldo de Araujo Pereira \ No newline at end of file |