Re: [Qemu-devel] [PATCH] hw/vexpress: set default block type to SD

[Peter Maydell]

On 5 March 2013 00:44, Aurelien Jarno <address@hidden> wrote:
> On Tue, Mar 05, 2013 at 08:22:57AM +0800, Peter Maydell wrote:
>> What effect does this actually have on the user experience?
>
> The effect is that the user don't has to specify the interface type.
> Basically:
>
>   -drive file=/path/to/file,if=sd
> can be replaced by
>   -drive file=/path/to/file
>
> It means the user doesn't have to know the details of the machine to
> know how to attach a disk. Note that the user here can also be a script,
> which then becomes a bit simpler.

I'm not convinced this is a good thing -- I think you should have
to know that you're attaching an SD card and not a hard disk,
because the performance is much worse. In particular if you
don't specify 'cache=writeback' your performance will be
dreadful, so you need to do something different from hard
disks anyhow.

-- PMM