linux-kernel - Re: [PATCH] Raise maximum number of memory controllers

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Date:   Thu, 27 Sep 2018 06:52:44 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Russ Anderson <rja@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Justin Ernst <justin.ernst@....com>, russ.anderson@....com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Aristeu Rozanski Filho <arozansk@...hat.com>
Subject: Re: [PATCH] Raise maximum number of memory controllers

On Wed, Sep 26, 2018 at 04:02:57PM -0700, Luck, Tony wrote:
> We don't have stats, nor control of power on a per memory controller
> or per dimm basis. So all these files are just noise.

Yeah, and also, looking at your previous mail, stuff like:

/sys/bus/mc6/devices/dimm0
/sys/bus/mc4/devices/dimm0

doesn't make any sense: why is mc* directly under bus? It should be
under ...bus/edac/mc/...

We'll have to clean it up carefully, when there's time.

> But ... we are at -rc5. Not sure that we'll figure out, write, test & debug
> the proper solution in the next 3-4 weeks. So perhaps we should apply
> 
> -#define EDAC_MAX_MCS   16
> +#define EDAC_MAX_MCS   64
> 
> as a temporary band-aid to get HPE's 32-socket machine running while
> we work on the proper fix?

Yeah, after sleeping on it I see it the same way - band-aid it now and
clean it up properly later.

Thx.

-- 
Regards/Gruss,
    Boris.

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