On Mon, Nov 22, 2010 at 12:18:13PM -0500, Lei Lu wrote:> Hi everyone,
>
> Can anybody clarify about what disk cache mechanism the current Xen
> hypervisor use? is it write through or write back? Is there a way to
> change between this two modes? As far as I know, the original linux
> kernel implements the disk cache as page cache and the flusher thread
> may periodically flush the dirty pages to the disk. Does Xen still use
> this strategy by default or not?
>
Hey,
Actually Xen *hypervisor* itself doesn''t affect this..
it depends on your dom0 setup.. ie. what disk backend you
choose for the guest vm virtual disks.
file: backed disks use dom0 linux kernel caching,
but tap:aio: or phy: backed disks don''t..
-- Pasi
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