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Re: [PATCH v5 2/6] xen/console: make console buffer size configurable
- To: dmukhin@xxxxxxx
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Feb 2026 09:43:31 +0100
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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: Thu, 05 Feb 2026 08:43:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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).
Jan
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