Re: [PATCH 3/4] Documentation: x86: Clarify MBA takes MB as referring to mba_sc

From: Fenghua Yu
Date: Fri Jun 07 2019 - 17:41:43 EST


On Fri, Jun 07, 2019 at 04:14:08PM +0100, James Morse wrote:
> "If the MBA is specified in MB then user can enter the max b/w in MB"
> is a tautology. How can the user know if the schemata takes a percentage
> or a MB/s value?
>
> This is referring to whether the software controller is interpreting
> the schemata's value. Make this clear.
>
> Signed-off-by: James Morse <james.morse@xxxxxxx>
> ---
> Documentation/x86/resctrl_ui.rst | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/x86/resctrl_ui.rst b/Documentation/x86/resctrl_ui.rst
> index 638cd987937d..866b66aa289b 100644
> --- a/Documentation/x86/resctrl_ui.rst
> +++ b/Documentation/x86/resctrl_ui.rst
> @@ -677,8 +677,8 @@ allocations can overlap or not. The allocations specifies the maximum
> b/w that the group may be able to use and the system admin can configure
> the b/w accordingly.
>
> -If the MBA is specified in MB(megabytes) then user can enter the max b/w in MB
> -rather than the percentage values.
> +If resctrl is using the software controller (mba_sc) then user can enter the
> +max b/w in MB rather than the percentage values.
> ::
>
> # echo "L3:0=3;1=c\nMB:0=1024;1=500" > /sys/fs/resctrl/p0/schemata
> --
> 2.20.1
>

Acked-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>

Thanks.

-Fenghua