Heavy network performance problem
Bug #177512 reported by
Fridtjof Busse
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
linux-source-2.6.22 (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned |
Bug Description
Running Xen 3.1 on gutsy, I have extreme network performance problems with the domUs, tested in routed and bridged setup.
When downloading from the domU (e.g. via http), I get only 40 kB on a 100MBit link.
I see "DUP Ack", "Retransmission" and "Previous segment lost" in wireshark.
When the domU downloads something itself, it's wirespeed at 8 MB/s. I have never seen this problem with a kernel from xensource.
Debugging seems very hard, but if I can help somehow, please let me know.
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Additional information: After switching from vif-route to vif-bridge, at least the domUs could communicate fast again, with vif-route, they were as slow as the external link.
'ifconfig' also shows dropped packets for the vif* interfaces.