linux-kernel - Re: [PATCH] drm/ci: Default to UART for logging

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Date:   Fri, 13 Oct 2023 11:14:02 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Daniel Stone <daniel@...ishbar.org>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Emma Anholt <emma@...olt.net>,
        open list <linux-kernel@...r.kernel.org>,
        Helen Koike <helen.koike@...labora.com>
Subject: Re: [PATCH] drm/ci: Default to UART for logging

On Fri, Oct 13, 2023 at 9:28 AM Daniel Stone <daniel@...ishbar.org> wrote:
>
> On Fri, 6 Oct 2023 at 18:32, Rob Clark <robdclark@...il.com> wrote:
> > ssh logging is the default for mesa, as it is generally more reliable.
> > But if there are kernel issues, especially at boot, UART logging is
> > infinitely more useful.
>
> Hmm, we should still be capturing the UART boot logs regardless. Those
> go into a collapsed 'LAVA boot' section but they don't just disappear
> ... ?

Hmm, I wasn't seeing anything in the raw log, which doesn't collapse sections..

That said, I still think uart is preferable to ssh for kernel CI.. we
aren't running jobs at the scale of mesa CI jobs so even if we get
UART flakes 1/1000 (or even 1/100) times, that is an acceptable
trade-off for the fact that uart can still work when things are too
fubar for ssh.

BR,
-R