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[Qemu-devel] Problem with high load average when using -nographic with q
[Qemu-devel] Problem with high load average when using -nographic with qemu in background
Sat, 6 Jan 2007 10:08:09 -0700
Sorry to bother you with this. I did try the qemu forums first.
I am having trouble running a trixbox/centos guest under an ubuntu host. Both
completely uptodate installs of the OS's. I am using Qemu 0.8.2 with
If I start the qemu without -nographic interactively the VM runs well, and the
hostOS maintains a load average of about 0.1
Trouble comes when I add -nographic to the command line, and redirect stdout
and stderrout to a logfile. (I do this so I can start qemu from during the
boot up process and run the VM in background all the time.
If I start qemu like this (from an interactive shell (tcsh))
qemu -m 256 -localtime -net nic -net tap -nographic trixbox.img \
>&! /tmp/qemulog &
It will stop on
+ Suspended[tty output]
If I also redirect stdin (eg adding "< /dev/null") it then starts and runs
fine, but the hostOS load climbs to 1.0 and higher (depending on what the
guest is doing, and the performance of the VM is seriously impaired.
I can ssh into the machine under both scenarios and see that the guest thinks
it is fine, but it is really burdening the hostOS.
Looking through /var/log/messages on the guest shows that I have (I think)
successfully set io to go through /dev/ttyS0, eg.
Jan 6 09:46:49 asterisk1 kernel: Kernel command line: ro console=ttyS0,9600n8
Can anyone offer advice?
- [Qemu-devel] Problem with high load average when using -nographic with qemu in background,
Phil Rasch <=