Re: [PATCH net-next v2 0/2] selftests: drv-net: so_txtime: trivial fixes

[Willem de Bruijn <willemdebruijn.kernel@gmail.com>]

Willem de Bruijn wrote:
> Jakub Kicinski wrote:
> > I noticed that so_txtime is only passing on NIPA setups which are
> > looped within a single host. The cross-machine cases just flat out
> > fail. The initial bug is obvious - the test does not deploy the binary.
> > But even with that I think more work would be needed to sync the
> > time / adjust the expectations for a dual-machine test.
> > 
> > Willem promised to follow up on the fundamental issues with 2-host
> > setups :)
> 
> Yep.

With these fixes the tests run fine manually on a non-dbg kernel.

The CI failures are on the netdev-X710-dbg remote only, correct?

https://netdev.bots.linux.dev/flakes.html
https://netdev.bots.linux.dev/contest.html?executor=hwksft-X710-dbg&test=so-txtime-py

Those flakes all have a delivery later than expected, e.g.,

    # # Exception|   STDERR: payload:a delay:30747 expected:0 (us)
    # # Exception|           exceeds variance (4000 us)

Does this remote have KSFT_MACHINE_SLOW set? This should only result in error

From contest/remote/lib/vm.py on nipa.git:

        slowdown = self.config.getfloat('vm', 'slowdown', fallback=0)
        if slowdown:
            self.cmd("export KSFT_MACHINE_SLOW=yes")

But I don't know where (or whether) I can review this config.