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qcow2: Make cache=writethrough default

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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>
This commit is contained in:
Kevin Wolf 2009-06-30 13:06:04 +02:00 • committed by Anthony Liguori
parent fc5b81d1f6
commit 0aa217e461
4 changed files with 3 additions and 16 deletions
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8
block/qcow2.c
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@ -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;