Am 28.03.2014 16:53, schrieb Eric Blake: > On 03/28/2014 08:46 AM, Peter Lieven wrote: >> this patch tries to optimize zero write requests >> by automatically using bdrv_write_zeroes if it is >> supported by the format. >> >> This significantly speeds up file system initialization and >> should speed zero write test used to test backend storage >> performance. >> >> block.c | 39 ++++++++++++++++++++++++++++++++++++++- >> include/block/block_int.h | 12 ++++++++++++ >> include/qemu-common.h | 1 + >> qemu-options.hx | 6 ++++++ >> util/iov.c | 21 +++++++++++++++++++++ >> 5 files changed, 78 insertions(+), 1 deletion(-) >> > Is there any QMP query- command that can expose the current setting of > this value? Is this something worth making changeable during runtime? > Is it something that can be requested per-disk at hotplug time?
currently there is no qmp query command I would add it to "query-block" if noone has objections. I don't think that its needed to change this at runtime. Setting it at hotplug time is, of course, reasonable. I will look at this and send a respin. Thanks for the suggestions, Peter
