Am 25.11.2014 um 10:21 hat Max Reitz geschrieben: > On 2014-11-25 at 10:21, Kevin Wolf wrote: > >Am 25.11.2014 um 10:12 hat Max Reitz geschrieben: > >>On 2014-10-28 at 07:45, Fam Zheng wrote: > >>>Using /tmp (usually mounted as tmpfs) and cache=writeback, the quick > >>>group can be quicker. > >>> > >>>On my laptop (Lenovo T430s with Fedora 20), this reduces the time from > >>>50s to 30s. > >>> > >>>Signed-off-by: Fam Zheng <f...@redhat.com> > >>>--- > >>> tests/qemu-iotests-quick.sh | 2 +- > >>> 1 file changed, 1 insertion(+), 1 deletion(-) > >>> > >>>diff --git a/tests/qemu-iotests-quick.sh b/tests/qemu-iotests-quick.sh > >>>index 12af731..0b54dbf 100755 > >>>--- a/tests/qemu-iotests-quick.sh > >>>+++ b/tests/qemu-iotests-quick.sh > >>>@@ -3,6 +3,6 @@ > >>> cd tests/qemu-iotests > >>> ret=0 > >>>-./check -T -qcow2 -g quick || ret=1 > >>>+TEST_DIR=/tmp/qemu-iotests-quick-$$ ./check -T -qcow2 -g quick -c > >>>writeback || ret=1 > >>There are (at least) two tests which don't work with -c writeback > >>(026 and 039), one of them is in the quick group (039). Why not use > >>-c writethrough? It doesn't make any difference on tmpfs anyway (we > >>can't omit it because that will break 091). > >Why use any -c? The default is the fast option writeback, and for those > >test cases that don't support writeback, something working is chosen > >instead. > > Because that breaks 091.
That's unfortunate. I wish tmpfs supported O_DIRECT... But let's just remove it from quick then - it doesn't really matter if it doesn't run because of the cache mode or because we didn't include it in the group. -c writethrough is okay as long as you really have tmpfs on your /tmp, but it really hurts when you don't (and I for one don't, standard RHEL 7 installation). Kevin