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    SubjectRe: [PATCH 1/6] x86-mce: Modify CMCI poll interval to adjust for small check_interval values.
    On Thu, Jul 10, 2014 at 10:16:56AM -0700, Havard Skinnemoen wrote:
    > Date: Thu, 10 Jul 2014 10:16:56 -0700
    > From: Havard Skinnemoen <hskinnemoen@google.com>
    > To: "Chen, Gong" <gong.chen@linux.intel.com>
    > Cc: Borislav Petkov <bp@alien8.de>, Tony Luck <tony.luck@intel.com>, Linux
    > Kernel <linux-kernel@vger.kernel.org>, Ewout van Bekkum <ewout@google.com>
    > Subject: Re: [PATCH 1/6] x86-mce: Modify CMCI poll interval to adjust for
    > small check_interval values.
    >
    > On Thu, Jul 10, 2014 at 2:01 AM, Chen, Gong <gong.chen@linux.intel.com> wrote:
    > > On Wed, Jul 09, 2014 at 02:24:31PM -0700, Havard Skinnemoen wrote:
    > >> On Wed, Jul 9, 2014 at 12:17 PM, Borislav Petkov <bp@alien8.de> wrote:
    > >> > Why min 3 polls? How do you come up with exactly that frequency?
    > >>
    > >> The idea is that if we make it equal to check_interval, it might
    > >> bounce back and forth a lot. So we need to divide by something, and 8
    > >> seems like a nice, safe value, and it seems to work well. We're not
    > >> opposed to considering other values, of course (e.g. 2 and 4 might
    > >> work well too, but with somewhat higher risk of ping-ponging).
    > > That value looks chosen a little bit at will. How about updating
    > > CMCI_POLL_INTERVAL when check_interval is changed to ensure
    > > CMCI_POLL_INTERVAL <= check_interval always.
    >
    > I guess that would work equally well, but we still need to determine
    > the magic number of how much less we want CMCI_POLL_INTERVAL to be.
    >
    > Havard
    I mean you can change CMCI_POLL_INTERVAL from a macro to a variable and
    then do prove check.
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