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authorKevin Wolf <kwolf@redhat.com>2009-06-30 13:06:04 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2009-07-09 16:06:37 -0500
commit0aa217e46124e873f75501f7187657e063f5903b (patch)
treeb6d293dd84f7a3bc8eb8a1d9358b1a2f3ccc0a34 /block
parentfc5b81d1f6df7342f0963120b2cf3e919d6fc08a (diff)
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qcow2: Make cache=writethrough default
The performance of qcow2 has improved meanwhile, so we don't need to special-case it any more. Switch the default to write-through caching like all other block drivers. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'block')
-rw-r--r--block/qcow2.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/block/qcow2.c b/block/qcow2.c
index 20c114b..9a7c666 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -145,14 +145,6 @@ static int qcow_open(BlockDriverState *bs, const char *filename, int flags)
QCowHeader header;
uint64_t ext_end;
- /* Performance is terrible right now with cache=writethrough due mainly
- * to reference count updates. If the user does not explicitly specify
- * a caching type, force to writeback caching.
- */
- if ((flags & BDRV_O_CACHE_DEF)) {
- flags |= BDRV_O_CACHE_WB;
- flags &= ~BDRV_O_CACHE_DEF;
- }
ret = bdrv_file_open(&s->hd, filename, flags);
if (ret < 0)
return ret;