[libvirt-users] Setting elevator=noop in the guest necessary?
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Hi everyone,
I found an article about libvirt, and one thing that I have not seen
anywhere else:
IMPORTANT: If you boot a Linux VM, you might want to add
“elevator=noop” to your Linux boot command line to force the disk
scheduler to let the host machine handle the disk writes
reorganisations (like tunnelling tcp over tcp, it is bad to have
two schedulers trying to do each other’s job). For example, on
GRUB2 on Debian, you have to append “elevator=noop” after
GRUB_CMDLINE_LINUX in /etc/default/grub.
(from
http://blog.normation.com/en/2012/03/09/a-guide-to-the-everyday-use-of-li...)
Is this necessary? Or is this even a good idea? Is this outdated? Or
does it depend on the kind of hypervisor (XEN, KVM,...)?
The few qemu/KVM-machines I have tested did work fine without this,
although at this point I just set them up and did a few program
installations, no real 'workload'.
Thanks in advance.
Regards,
Johannes
- --
...Unix, MS-DOS, and Windows NT (also known as the Good, the Bad, and
the Ugly).
(Matt Welsh)
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