Re: [PATCH 4/8] selftests: ublk: use auto_zc for PER_IO_DAEMON tests in stress_04

[Ming Lei <ming.lei@redhat.com>]

On Thu, Dec 11, 2025 at 06:57:51PM -0800, Caleb Sander Mateos wrote:
> On Thu, Dec 11, 2025 at 1:06 AM Ming Lei <ming.lei@redhat.com> wrote:
> >
> > On Wed, Dec 10, 2025 at 10:15:59PM -0700, Caleb Sander Mateos wrote:
> > > stress_04 is described as "run IO and kill ublk server(zero copy)" but
> > > the --per_io_tasks tests cases don't use zero copy. Plus, one of the
> > > test cases is duplicated. Add --auto_zc to these test cases and
> > > --auto_zc_fallback to one of the duplicated ones. This matches the test
> > > cases in stress_03.
> > >
> > > Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
> > > ---
> > >  tools/testing/selftests/ublk/test_stress_04.sh | 8 ++++----
> > >  1 file changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/ublk/test_stress_04.sh b/tools/testing/selftests/ublk/test_stress_04.sh
> > > index 3f901db4d09d..965befcee830 100755
> > > --- a/tools/testing/selftests/ublk/test_stress_04.sh
> > > +++ b/tools/testing/selftests/ublk/test_stress_04.sh
> > > @@ -38,14 +38,14 @@ if _have_feature "AUTO_BUF_REG"; then
> > >       ublk_io_and_kill_daemon 256M -t stripe -q 4 --auto_zc --no_ublk_fixed_fd "${UBLK_BACKFILES[1]}" "${UBLK_BACKFILES[2]}" &
> > >       ublk_io_and_kill_daemon 8G -t null -q 4 -z --auto_zc --auto_zc_fallback &
> > >  fi
> > >
> > >  if _have_feature "PER_IO_DAEMON"; then
> > > -     ublk_io_and_kill_daemon 8G -t null -q 4 --nthreads 8 --per_io_tasks &
> > > -     ublk_io_and_kill_daemon 256M -t loop -q 4 --nthreads 8 --per_io_tasks "${UBLK_BACKFILES[0]}" &
> > > -     ublk_io_and_kill_daemon 256M -t stripe -q 4 --nthreads 8 --per_io_tasks "${UBLK_BACKFILES[1]}" "${UBLK_BACKFILES[2]}" &
> > > -     ublk_io_and_kill_daemon 8G -t null -q 4 --nthreads 8 --per_io_tasks &
> > > +     ublk_io_and_kill_daemon 8G -t null -q 4 --auto_zc --nthreads 8 --per_io_tasks &
> > > +     ublk_io_and_kill_daemon 256M -t loop -q 4 --auto_zc --nthreads 8 --per_io_tasks "${UBLK_BACKFILES[0]}" &
> > > +     ublk_io_and_kill_daemon 256M -t stripe -q 4 --auto_zc --nthreads 8 --per_io_tasks "${UBLK_BACKFILES[1]}" "${UBLK_BACKFILES[2]}" &
> > > +     ublk_io_and_kill_daemon 8G -t null -q 4 --auto_zc --auto_zc_fallback --nthreads 8 --per_io_tasks &
> >
> > I'd rather to fix the test description, the original motivation is to cover
> > more data copy parameters(--z, --auto_zc, plain copy) in same stress test.
> 
> test_stress_02.sh ("run IO and kill ublk server") already covers plain
> copy. But sure, I can change the test_stress_04.sh description to "...
> (more features)" or something.

oops, stress_02 is same kind of test with stress_04.sh, I missed this point.

Your patch looks correct to make stress_04 for covering zero copy only.

Sorry for the noise.


Thanks,
Ming