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Bug#667604: Low network speed with -vnc option

April 05th, 2012 - 05:50 am ET by Svante Signell | Report spam
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Package: qemu-kvm
Version: 1.0+dfsg-2
Severity: important

Hello,

With recent qemu-kvm versions (don't know since when) network speed
slows down from 2.6 Mbps to less than 300 kbps with GNU/Linux as host
and GNU/Hurd as guest, using the -vnc :n option. Without this option
network speed is OK, around 2.6 Mbps. This has been tested on two
different boxes with Intel and AMD CPUs and with various emulated
network cards. Strange thing is that when issuing a lot of disk
activity on the guest, network speed increases to normal??

Thanks!




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#1 Michael Tokarev
April 05th, 2012 - 06:10 am ET | Report spam
On 05.04.2012 13:25, Svante Signell wrote:
Package: qemu-kvm
Version: 1.0+dfsg-2
Severity: important

Hello,

With recent qemu-kvm versions (don't know since when) network speed
slows down from 2.6 Mbps to less than 300 kbps with GNU/Linux as host
and GNU/Hurd as guest, using the -vnc :n option. Without this option
network speed is OK, around 2.6 Mbps. This has been tested on two
different boxes with Intel and AMD CPUs and with various emulated
network cards. Strange thing is that when issuing a lot of disk
activity on the guest, network speed increases to normal??



It appears to be yet another... strange bugreport - there were a few
bugreports recently which makes absolutely no sense.

The thing is that vnc has very very little to do with guest, it is
a separate thread unrelated to any and all guest activity.

Can you at least give me exact steps to reproduce the issue?

And one more thing: why do you think this bug has severity "important"
instead of "normal" ?

/mjt



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