From 137519ce2e269915de0f67a13ac32b67605cad72 Mon Sep 17 00:00:00 2001 From: aurel32 Date: Sun, 30 Nov 2008 19:12:49 +0000 Subject: qemu-img: open files with cache=writeback Data integrity is not important in qemu-img, so open the files with cache=writeback. This fixes the performance regression seen with qemu-img since revision 5485, and most particularly with the qcow2 format. Signed-off-by: Aurelien Jarno git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5839 c046a42c-6fe2-441c-8c8c-71466251a162 --- qemu-img.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'qemu-img.c') diff --git a/qemu-img.c b/qemu-img.c index 70c2403872..207535f4f7 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -30,6 +30,9 @@ #include #endif +/* Default to cache=writeback as data integrity is not important for qemu-tcg. */ +#define BRDV_O_FLAGS BDRV_O_CACHE_WB + static void __attribute__((noreturn)) error(const char *fmt, ...) { va_list ap; @@ -186,7 +189,7 @@ static BlockDriverState *bdrv_new_open(const char *filename, } else { drv = NULL; } - if (bdrv_open2(bs, filename, 0, drv) < 0) { + if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) { error("Could not open '%s'", filename); } if (bdrv_is_encrypted(bs)) { @@ -317,7 +320,7 @@ static int img_commit(int argc, char **argv) } else { drv = NULL; } - if (bdrv_open2(bs, filename, 0, drv) < 0) { + if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) { error("Could not open '%s'", filename); } ret = bdrv_commit(bs); @@ -691,7 +694,7 @@ static int img_info(int argc, char **argv) } else { drv = NULL; } - if (bdrv_open2(bs, filename, 0, drv) < 0) { + if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) { error("Could not open '%s'", filename); } bdrv_get_format(bs, fmt_name, sizeof(fmt_name)); -- cgit v1.2.3-55-g7522