Re: [PATCH v5 2/6] xen/console: make console buffer size configurable

[dmukhin@ford.com]

On Thu, Feb 05, 2026 at 09:43:31AM +0100, Jan Beulich wrote:
> On 05.02.2026 02:36, dmukhin@xen.org 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