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Re: [PATCH v3] console/serial: bump buffer from 16K to 128K
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 19 Sep 2023 16:14:43 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 19 Sep 2023 14:15:13 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Sep 19, 2023 at 03:06:45PM +0200, Jan Beulich wrote:
> On 19.09.2023 14:51, Roger Pau Monne wrote:
> > Testing on a Kaby Lake box with 8 CPUs leads to the serial buffer
> > being filled halfway during dom0 boot, and thus a non-trivial chunk of
> > Linux boot messages are dropped.
> >
> > Increasing the buffer to 128K does fix the issue and Linux boot
> > messages are no longer dropped. There's no justification either on
> > why 16K was chosen, and hence bumping to 128K in order to cope with
> > current systems generating output faster does seem appropriate to have
> > a better user experience with the provided defaults.
> >
> > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> > --
> > Changes since v2:
> > - Bump to 128K.
>
> Wow, I was hesitant about 32k, and now we're going all the way up to 128?
> Even the recent report indicated 24k would be fine there ...
24k would be rounded to 32k anyway.
I don't think 32k vs 128k makes that much difference, it's still an
infinitesimal part of the memory on any modern computer. Simply the
risk of loosing output is IMO not worth us being conservative with
the amount here, specially if we are speaking about KiB, not even MiB.
Thanks, Roger.
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