[Xen-users] GPLPV: XenNet Full on send - required = 3, available = 0

[Nerijus Narmontas <n.narmontas@xxxxxxxxx>]

I saw some really bad things happening on our production servers.

First dom0:

Ubuntu xen1 2.6.24-24-xen
Xen 3.4.0 compiled from source.
I don't remember exactly what GPLPV version was installed but I know
for sure from early 10.x series.
domU: Windows Server 2008 64-bit (Test mode enabled)

Second dom0 has almost identical setup, thou on different hardware.

When I start copying large file (over 300MB) through network, the
server from which I initiate copy stops responding to network (Remote
Desktop hangs),
and /var/log/xen/qemu-dm-mymachine.log gets filled with these lines
(lots of them):

XenNet     Full on send - required = 3, available = 0
XenNet     Full on send - required = 3, available = 0
XenNet     Full on send - required = 3, available = 0
XenNet     Full on send - required = 3, available = 1
XenNet     Full on send - required = 3, available = 1
XenNet     Full on send - required = 3, available = 1
XenNet     Full on send - required = 3, available = 1
XenNet     Full on send - required = 3, available = 1
XenNet     Full on send - required = 3, available = 2
XenNet     Full on send - required = 3, available = 2
XenNet     Full on send - required = 3, available = 2

After a while RDP responds.

I understand this must be related to GPLPV drivers.

--
Nerijus

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