From 0aa217e46124e873f75501f7187657e063f5903b Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Tue, 30 Jun 2009 13:06:04 +0200 Subject: 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 Signed-off-by: Anthony Liguori --- block/qcow2.c | 8 -------- 1 file changed, 8 deletions(-) (limited to 'block') 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; -- cgit v1.1