Re: [Qemu-devel] [RFC PATCHv2] block: optimize zero writes with bdrv_write_zeroes

[Markus Armbruster]

Peter Lieven <address@hidden> writes:

> this patch tries to optimize zero write requests
> by automatically using bdrv_write_zeroes if it is
> supported by the format.
>
> this should significantly speed up file system initialization and
> should speed zero write test used to test backend storage performance.
>
> the difference can simply be tested by e.g.
>
> dd if=/dev/zero of=/dev/vdX bs=1M

Got actual numbers?  Preferably for some operation that matters to
users.

[...]