On Thu, Jul 21, 2022 at 12:40 PM Darrick J. Wong <djwong@xxxxxxxxxx> wrote: > > On Thu, Jul 21, 2022 at 10:29:59AM +0800, bxue@xxxxxxxxxx wrote: > > From: Boyang Xue <bxue@xxxxxxxxxx> > > > > The test requires larger scratch dev size when running on top of NFS other > > than ext4 and xfs. It requires at least 27GB in my test. Without this > > requirement, the test run never finishes on NFS, leaving 100% scratch disk > > space use. > > > Signed-off-by: Boyang Xue <bxue@xxxxxxxxxx> > > --- > > Hi, > > > > I find generic/476 easily goes into an infinite run on top of NFS. When it > > Infinite? It's only supposed to start 25000*nr_cpus*TIME_FACTOR > operations, so it /should/ conclude eventually. That includes driving > the filesystem completel out of space, but there ought to be enough > unlink/rmdir/truncate calls to free up space every now and then... Yes. I'm not sure the calculations inside, but when the size of the scratch device < 27GB (can be 26GB when the backing storage is ext4 rather than xfs), the test runs infinitely. I'm aware that the test should be slow, especially on NFS, but I see the test never finishes after multi-days. This problem happens in both localhost exported NFS and remote exported NFS configurations. > > > happens, the common pattern is 100% disk space use of SCRATCH_MNT, and > > `nfsiostat` shows 50% write error on SCRATCH_MNT. When I run it with a large > > enough SCRATCH_MNT, the problem disappears. So I post this patch to add the size > > requirement. > > > > Please help review this patch. Thanks! > > > > -Boyang > > > > tests/generic/476 | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/tests/generic/476 b/tests/generic/476 > > index 212373d1..dcc7c3da 100755 > > --- a/tests/generic/476 > > +++ b/tests/generic/476 > > @@ -24,6 +24,7 @@ _cleanup() > > _supported_fs generic > > > > _require_scratch > > +_require_scratch_size $((27 * 1024 * 1024)) # 27GB > > ...so IDGI, this test works as intended. Are you saying that NFS > command overhead is so high that this test takes too long? > > --D > > > _require_command "$KILLALL_PROG" "killall" > > > > echo "Silence is golden." > > -- > > 2.27.0 > > >
