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,

But for the most part, we track bare metal fairly well in terms of block 
performance, no?

Or are you really referring to qcow2 as a specific example?  In the 
past, we used a different default caching mode for qcow2.  I think that 
could be done again if there was a compelling reason.

Regards,

Anthony Liguori