We've deployed Xen 3.0.2-2 successfully on a CentOS 4.3 installation running on
a Dell PE 2950 servers. On a HVM/VMX guest also running CentOS 4.3 with the
configuration below, we see occasional DMA messages in the guests dmesg output,
they don't occur often and for no obvious reason - it seems they normally occur
when the load on the host system is low.
hda: dma_timer_expiry: dma status == 0x24
hda: DMA interrupt recovery
hda: lost interrupt
Windows 2003 server guests on the same host system don't appear to have any
problems (at least none are logged), but two Linux guests do, the above one
CentOS and a Fedora core 3 system. Does anyone have any idea how to solve this?
import os, re
arch = os.uname()
if re.search('64', arch):
arch_libdir = 'lib64'
arch_libdir = 'lib'
kernel = "/usr/lib/xen/boot/hvmloader"
memory = 256
name = "CentOS4.3_01"
vif = [ 'type=ioemu, bridge=xenbr0' ]
disk = [ 'phy:/dev/XEN/CentOS4.3_01,ioemu:hda,w' ]
device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
#cdrom = '/dev/hda'
The second problem we've encountered, which appears not to be listed in the bug
tracker. When any one of these guests is rebooted from inside the guest, some
of the xen guest configuration appears not to be re-read/re-used. For example,
we have noticed this when we have statically allocated the host cpu's each
guest should run on; after a reboot (viewing "xm vcpu-list") the CPU Affinity
changes from the defined one to "any cpu".
Any help appreciated
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