commit 0aa217e46124e873f75501f7187657e063f5903b
author Kevin Wolf <kwolf@redhat.com> Tue Jun 30 13:06:04 2009 +0200
committer Anthony Liguori <aliguori@us.ibm.com> Thu Jul 09 16:06:37 2009 -0500
tree b6d293dd84f7a3bc8eb8a1d9358b1a2f3ccc0a34
parent fc5b81d1f6df7342f0963120b2cf3e919d6fc08a

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>

vl.c

diff --git a/vl.c b/vl.c
index 7b7489c..5189ad5 100644
--- a/vl.c
+++ b/vl.c
@@ -2239,7 +2239,7 @@
     unit_id = -1;
     translation = BIOS_ATA_TRANSLATION_AUTO;
     index = -1;
-    cache = 3;
+    cache = 1;
 
     if (machine->use_scsi) {
         type = IF_SCSI;
@@ -2557,8 +2557,6 @@
         bdrv_flags |= BDRV_O_NOCACHE;
     else if (cache == 2) /* write-back */
         bdrv_flags |= BDRV_O_CACHE_WB;
-    else if (cache == 3) /* not specified */
-        bdrv_flags |= BDRV_O_CACHE_DEF;
     if (bdrv_open2(bdrv, file, bdrv_flags, drv) < 0) {
         fprintf(stderr, "qemu: could not open disk image %s\n",
                         file);