[Bug 390699] [NEW] Ubuntu 9.04 VM has poor network performance on 8.10 host

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I'm running Ubuntu 8.10 amd64 on a host with hardware virtualization
(4-core 2.6ghz AMD machine) using virt-manager (libvirtd) and kvm.

All VMs are 32bit (8.10 and 9.04)

The 8.10 guests on this host can transfer at 20+ M/s to the host.
(1000mbps speeds)

The 9.04 guest, created the same way, is capped at 11M/s (100mbps
speeds)

I ran several tests with 1GB files (dd if=/dev/zero of=test bs=1M
count=1024)

root at ubuntu904se32:~# scp test root at 192.168.0.1:/tmp
root at 192.168.0.1's password:
test                                          100% 1024MB  11.9MB/s   01:26

root at ubuntu810liveserv:~# scp test root at 192.168.0.1:/tmp
root at 192.168.0.1's password:
test                                          100% 1024MB  24.4MB/s   00:42

root at services810:~# scp test root at 192.168.0.1:/tmp
root at 192.168.0.1's password:
test                                          100% 1024MB  22.3MB/s   00:46

Any suggestions for how to troubleshoot this further would be
appreciated.

Thanks

** Affects: kvm (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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Ubuntu 9.04 VM has poor network performance on 8.10 host
https://bugs.launchpad.net/bugs/390699
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