Hi,
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)
We actually were always impolitely dropping the connection and
not cleanly logging out.
Cc: qemu-sta...@nongnu.org
Signed-off-by: Peter Lieven p...@kamp.de
---
block/iscsi.c | 6 ++
1 file changed, 6 insertions(+)
diff --git a/block/iscsi.c b/block/iscsi.c
index ab20e4d..0b6d3dd 100644
---
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
On 14/04/2015 08:49, Peter Lieven wrote:
Hi,
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
On 14/04/2015 11:04, Stefan Hajnoczi wrote:
Do other commands besides writes rely on iscsi_co_flush()?
Paolo: I checked NBD and noticed there is an inconsistency there.
nbd_co_writev_1() uses FUA when bs-enable_write_cache == true but it
also sends flushes. Does that mean it's doing
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
