Hi Paolo,
On 06/02/2024 16:27, Paolo Abeni wrote:
> The gro self-tests sends the packets to be aggregated with
> multiple write operations.
>
> When running is slow environment, it's hard to guarantee that
> the GRO engine will wait for the last packet in an intended
> train.
>
> The above causes almost deterministic failures in our CI for
> the 'large' test-case.
>
> Address the issue explicitly ignoring failures for such case
> in slow environments (KSFT_MACHINE_SLOW==true).
To what value is KSFT_MACHINE_SLOW set in the CI?
Is it set to a different value if the machine is not slow? e.g.
KSFT_MACHINE_SLOW == false
(please see below)
> Fixes: 7d1575014a63 ("selftests/net: GRO coalesce test")
> Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
> ---
> Note that the fixes tag is there mainly to justify targeting the net
> tree, and this is aiming at net to hopefully make the test more stable
> ASAP for both trees.
>
> I experimented with a largish refactory replacing the multiple writes
> with a single GSO packet, but exhausted by time budget before reaching
> any good result.
> ---
> tools/testing/selftests/net/gro.sh | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/testing/selftests/net/gro.sh b/tools/testing/selftests/net/gro.sh
> index 19352f106c1d..114b5281a3f5 100755
> --- a/tools/testing/selftests/net/gro.sh
> +++ b/tools/testing/selftests/net/gro.sh
> @@ -31,6 +31,10 @@ run_test() {
> 1>>log.txt
> wait "${server_pid}"
> exit_code=$?
> + if [ ${test} == "large" -a -n "${KSFT_MACHINE_SLOW}" ]; then
Maybe best to avoid using:
-n "${KSFT_MACHINE_SLOW}"
Otherwise, we have the same behaviour if KSFT_MACHINE_SLOW is set to
1/yes/true or 0/no/false.
But maybe it is fine like that, and what is just missing is adding
somewhere how KSFT_MACHINE_SLOW is supposed to be set/used? :)
Not linked to that, but a small detail about the new line, just in case
you need to send a v2: it looks like it is better to avoid using '-a':
https://www.shellcheck.net/wiki/SC2166
(but here, it looks like the usage is fine)
> + echo "Ignoring errors due to slow environment" 1>&2
> + exit_code=0
> + fi
> if [[ "${exit_code}" -eq 0 ]]; then
> break;
> fi
Cheers,
Matt
--
Sponsored by the NGI0 Core fund.
