Re: [PATCH v2 4/8] selftests: ublk: use auto_zc for PER_IO_DAEMON tests in stress_04

[Ming Lei]

On Thu, Dec 11, 2025 at 10:16:54PM -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@xxxxxxxxxxxxxxx>
> ---
>  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 &

The last line needs `-z`, otherwise the following warning is dumped:

```
# selftests: ublk: test_stress_04.sh
# main: auto_zc_fallback is set but neither F_AUTO_BUF_REG nor F_SUPPORT_ZERO_COPY is enabled
# stress_04 : [FAIL]
```


Thanks,
Ming