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It is just a regular >> TCMU device, >> and its atomic write related sysfs attributes have value 0: >> >>    $ grep -rne . /sys/block/sdh/queue/ | grep atomic >>    /sys/block/sdh/queue/atomic_write_unit_max_bytes:1:0 >>    /sys/block/sdh/queue/atomic_write_boundary_bytes:1:0 >>    /sys/block/sdh/queue/atomic_write_max_bytes:1:0 >>    /sys/block/sdh/queue/atomic_write_unit_min_bytes:1:0 >> >> FYI, I attach the all sysfs queue attribute values of the device [2]. > > Yes, this would only be using software-based atomic writes. > > Shinichiro, do the other atomic writes tests run ok, like 775, 767? You > can check group "atomicwrites" to know which tests they are. > > 774 is the fio test. > > Some things to try: > - use a physical disk for the TEST_DEV > - Don't set LOAD_FACTOR (if you were setting it). If not, bodge 774 to > reduce $threads to a low value, say, 2 > - trying turning on XFS_DEBUG config > > BTW, Darrick has posted some xfs atomics fixes @ https://urldefense.com/ > v3/__https://lore.kernel.org/linux- > xfs/20251105001200.GV196370@frogsfrogsfrogs/T/*t__;Iw!!ACWV5N9M2RV99hQ! > IuEPY6yJ1ZEQu7dpfjUplkPJucOHMQ9cpPvIC4fiJhTi_X_7ImN0t6wGqxg9_GM6gWe4B1OBiBjEI8Gz_At0595tIQ$ . I doubt that they will help this, but worth trying. > > I will try to recreate. I tested this and the filesize which we try to write is huge, like 3.3G in my case. That seems excessive. The calc comes from the following in 774: filesize=$((aw_bsize * threads * 100)) aw_bsize for me is 1M, and threads is 32 aw_bsize is large as XFS supports software-based atomics, which is generally going to be huge compared to anything which HW can support. When I tried to run this test, it was not completing in a sane amount of time - it was taking many minutes before I gave up. @shinichiro, please try this: --- a/tests/generic/774 +++ b/tests/generic/774 @@ -29,7 +29,7 @@ aw_bsize=$(_max "$awu_min_write" "$((awu_max_write/4))") fsbsize=$(_get_block_size $SCRATCH_MNT) threads=$(_min "$(($(nproc) * 2 * LOAD_FACTOR))" "100") -filesize=$((aw_bsize * threads * 100)) +filesize=$((aw_bsize * threads)) depth=$threads aw_io_size=$((filesize / threads)) aw_io_inc=$aw_io_size ubuntu@jgarry-instance-20240626-1657-xfs-ubuntu:~/xfstests-dev$ Note, I ran with this change and the test now completes, but I get this: +fio: failed initializing LFSR +fio: failed initializing LFSR +fio: failed initializing LFSR +fio: failed initializing LFSR +verify: bad magic header 0, wanted acca at file /home/ubuntu/mnt/scratch/test-file offset 0, length 1048576 (requested block: offset=0, length=1048576) +verify: bad magic header e3d6, wanted acca at file /home/ubuntu/mnt/scratch/test-file offset 8388608, length 1048576 (requested block: offset=8388608, length=1048576) I need to check that fio complaint. Thanks, John