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[Qemu-devel] [PATCH] rbd : disable rbd_cache_writethrough_until_flush fo
From: |
Alexandre Derumier |
Subject: |
[Qemu-devel] [PATCH] rbd : disable rbd_cache_writethrough_until_flush for cache=unsafe |
Date: |
Wed, 27 Jul 2016 14:26:42 +0200 |
ceph force writethrough until a flush is detected.
With cache=unsafe, we never send flush.
So we need to tell to ceph
to set rbd_cache_writethrough_until_flush=false in this case.
This speedup a lot qemu-img convert which use cache=unsafe by default
Signed-off-by: Alexandre Derumier <address@hidden>
---
block/rbd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block/rbd.c b/block/rbd.c
index 0106fea..f3af6c8 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -552,6 +552,10 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict
*options, int flags,
rados_conf_set(s->cluster, "rbd_cache", "true");
}
+ if (flags & BDRV_O_NO_FLUSH) {
+ rados_conf_set(s->cluster, "rbd_cache_writethrough_until_flush",
"false");
+ }
+
r = rados_connect(s->cluster);
if (r < 0) {
error_setg_errno(errp, -r, "error connecting");
--
2.1.4
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