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Re: [PATCH v5 2/6] xen/console: make console buffer size configurable
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: dmukhin@xxxxxxxx
- Date: Thu, 5 Feb 2026 17:52:47 -0800
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 06 Feb 2026 01:53:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On Thu, Feb 05, 2026 at 09:43:31AM +0100, Jan Beulich wrote:
> On 05.02.2026 02:36, dmukhin@xxxxxxx wrote:
> > --- a/xen/drivers/char/Kconfig
> > +++ b/xen/drivers/char/Kconfig
> > @@ -95,6 +95,30 @@ config SERIAL_TX_BUFSIZE
> >
> > Default value is 32768 (32KiB).
> >
> > +config CONRING_SHIFT
> > + int "Console ring buffer size (power of 2)"
> > + range 14 27
> > + default 15
> > + help
> > + Select the boot console ring buffer size as a power of 2.
> > + Run-time console ring buffer size is the same as the boot console ring
> > + buffer size, unless overridden via 'conring_size=' boot parameter.
> > +
> > + 27 => 128 MiB
> > + 26 => 64 MiB
> > + 25 => 32 MiB
> > + 24 => 16 MiB
> > + 23 => 8 MiB
> > + 22 => 4 MiB
> > + 21 => 2 MiB
> > + 20 => 1 MiB
> > + 19 => 512 KiB
> > + 18 => 256 KiB
> > + 17 => 128 KiB
> > + 16 => 64 KiB
> > + 15 => 32 KiB (default)
> > + 14 => 16 KiB
>
> As I think I had indicated before - imo an exhaustive table goes too far here.
> E.g.
>
> 27 => 128 MiB
> 26 => 64 MiB
> ...
> 15 => 32 KiB (default)
> 14 => 16 KiB
>
> would do (if such is needed / wanted at all).
OK, will adjust as suggested.
Thanks!
>
> Jan
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