Re: Xen and Windows 2003 HVM

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

At 22:16 Uhr +0200 26.06.2008, Manuel Bouyer wrote:
> On Thu, Jun 26, 2008 at 05:26:19PM +0200, Hauke Fath wrote:
> >  Several times, the win2003 DomU has managed to lock up the entire
> >  machine by filling the (admittedly tight) space in the Dom0 file
> >  system by logging > 100 MB to /var/log/xen/qemu-dm.${PID}.log. What
> >  it logs is large amount of whitespace with a few dots and form feeds
> >  - it looks like a repeated attempt at an ascii screenshot from the
> >  Windows screen.
> >
> >  Since these logfiles are created per-process, management is
> >  difficult, especially for long-running sessions which don't seem to
> >  let go of their files.
> >
> >  Does anyone know of a way not to let a DomU log to those files?
>
> I don't know a way to avoid it, but my files are definitively small.
> Most are less than 512 bytes.

Well, most of them are too, here, but:

# ls -lS qemu* | head
-rw-r--r--  1 root  wheel  5966301 Jun 26 18:17 qemu-dm.11084.log
-rw-r--r--  1 root  wheel  1441752 Jun 27 10:28 qemu-dm.14072.log
-rw-r--r--  1 root  wheel    97851 Feb 18 09:57 qemu-dm.27244.log
-rw-r--r--  1 root  wheel      812 Jun 26 15:38 qemu-dm.11902.log
-rw-r--r--  1 root  wheel      809 Mar  3 17:06 qemu-dm.1186.log
-rw-r--r--  1 root  wheel      809 Mar  4 12:04 qemu-dm.7018.log
-rw-r--r--  1 root  wheel      808 Jan 29 11:49 qemu-dm.16404.log
-rw-r--r--  1 root  wheel      808 Jan 23 11:27 qemu-dm.5942.log
-rw-r--r--  1 root  wheel      738 Jan 22 14:19 qemu-dm.4434.log
-rw-r--r--  1 root  wheel      650 Mar  4 12:00 qemu-dm.6634.log
#

The file qemu-dm.14072.log e.g. starts with

domid: 32
qemu: the number of cpus is 1
Watching /local/domain/32/logdirty/next-active
qemu_map_cache_init nr_buckets = 4000 size 196608
shared page at pfn 1ffff
buffered io page at pfn 1fffd
Time offset set 0
xs_read(): vncpasswd get error. 
/vm/c5373a67-005c-a474-b081-05b77dd34895/vncpasswd.
Warning: Unable to initialize AAlib mouseUsing AAlib driver: Standard 
output driver (stdout)

and then tons of whitespace.

> What does ps axuww |grep qemu shows are parameters?

# ps axuww | grep qemu
root  14072  0.0  0.0 21700 309656 ?       IWa  10:25AM   1:00.02 
/usr/pkg/libexec/qemu-dm -d 32 -vcpus 1 -boot c -localtime -acpi -usb 
-usbdevice tablet -domain-name Brocken -net 
nic,vlan=1,macaddr=00:16:3e:00:48:11,model=rtl8139 -net 
tap,vlan=1,bridge=bridge0

        hauke

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