Am 14.04.2015 um 11:04 schrieb Stefan Hajnoczi:
On Tue, Apr 14, 2015 at 7:49 AM, Peter Lieven <p...@kamp.de> wrote:
Ronnie came up with an idea to reduce latency if !bs->enable_write_cache for
an iSCSI device.
If !bs->enable_write_cache Qemu sends a flush after every single write. What
could be done is
the following:
if (!bs->enable_write_cache)
set FUA (force unit access) and DPO (disable page out) bits in every write
cmd
make iscsi_co_flush a NOOP in this case.
Your thoughts?
Do other commands besides writes rely on iscsi_co_flush()?
That I was asking myself to. I cannot think of any currently. WRITESAME, of
course, but
I would consider this as write.
Peter
