Re: [Qemu-devel] Default cache mode

[Anthony Liguori]

On 06/29/2011 06:59 AM, Kevin Wolf wrote:
> Hi,
>
> I think we have touched this topic before during some IRC discussions or
> somewhere deep in a mailing list thread, but I think it hasn't been
> discussed on the list.
>
> Our default cache mode of cache=writethrough is extremely conservative
> and provides absolute safety at the cost of performance,


Thinking twice about this, shouldn't we just move to a simplified model:

-drive file=foo.img,cache=[on|off],hd0  -device 
virtio-blk-pci,drive=hd0,wce=1

As long as we advertise wce and wce can be toggled from the guest, I 
don't think the default is all that important.  I think cache=on is the 
right default for most common use cases.

Regards,

Anthony Liguori