Re: [Qemu-discuss] Disk Performance

[Dale R. Worley]

> From: Stephan von Krawczynski <address@hidden>

> let me shortly tell you my own experiences with virtual disk performance.
> In short: I stopped using image files of any kind. I switched to lvm
> partitions. The reason is that your virtual hosts will choke if you copy files
> to your physical host over the net or on the host itself. I tried everything
> to prevent that but in the end I gave up.

I'm no expert on this, but it sounds to me like the file copy is using
memory to cache disk blocks, swapping out the memory that is the
emulated memory of the guests.  It seems to me that the solution to
that is to force the Qemu process's memory space to remain in RAM.

Is there a way to do that in Linux?

Dale