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| author |   Alexander Graf <agraf@suse.de> | 2010-05-26 21:04:32 +0200 |
|---|---|---|
| committer |   Aurelien Jarno <aurelien@aurel32.net> | 2010-05-27 00:08:09 +0200 |
| commit | c317728872ee9de44a1514bbe1f1fc8d5f8a7aeb (patch) | |
| tree | fa826b48118bd11b8dae986a351abbe376de05bd /vl.c | |
| parent | sparc64: clean up pci bridge map (diff) | |
| download | qemu-kvm-c317728872ee9de44a1514bbe1f1fc8d5f8a7aeb.tar.gz qemu-kvm-c317728872ee9de44a1514bbe1f1fc8d5f8a7aeb.tar.bz2 qemu-kvm-c317728872ee9de44a1514bbe1f1fc8d5f8a7aeb.zip | |
Make cache=unsafe the default for -snapshot
When using -snapshot we don't care about data integrity of the cow file
at all, so let's disable flushing there and squeeze out the last drop
of performance we could possibly get.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'vl.c')
| -rw-r--r-- | vl.c | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -1105,9 +1105,9 @@ DriveInfo *drive_init(QemuOpts *opts, void *opaque, return NULL; } if (snapshot) { - /* always use write-back with snapshot */ + /* always use cache=unsafe with snapshot */ bdrv_flags &= ~BDRV_O_CACHE_MASK; - bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB); + bdrv_flags |= (BDRV_O_SNAPSHOT|BDRV_O_CACHE_WB|BDRV_O_NO_FLUSH); } if (media == MEDIA_CDROM) { |