linux-kernel - Re: [PATCH] x86_64: dynamic MCE poll interval

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Message-ID: <20070427170230.GA4574@muc.de>
Date:	Fri, 27 Apr 2007 19:02:30 +0200
From:	Andi Kleen <ak@....de>
To:	Tim Hockin <thockin@...gle.com>
Cc:	vojtech@...e.cz, linux-kernel@...r.kernel.org, akpm@...gle.com
Subject: Re: [PATCH] x86_64: dynamic MCE poll interval

On Fri, Apr 27, 2007 at 09:58:14AM -0700, Tim Hockin wrote:
> On 27 Apr 2007 11:09:17 +0200, Andi Kleen <ak@....de> wrote:
> >On Thu, Apr 26, 2007 at 06:02:52PM -0700, Tim Hockin wrote:
> >> Description:
> >>  This patch makes the MCE poller adjust the polling interval dynamically.
> >>  If we find an MCE, poll 2x faster (down to 10 ms).  When we stop finding
> >>  MCEs, poll 2x slower (up to check_interval seconds).  The check_interval
> >>  tunable becomes the max polling interval.
> >
> >Can you please fix the documentation then?
> 
> Which documentation, specifically? :)

Documentation/x86_64/{boot-options.txt,machinecheck}

> 
> >> Result:
> >>  If you start to take a lot of correctable errors (not exceptions), you
> >>  log them faster and more accurately (less chance of overflowing the MCA
> >>  registers).  If you don't take a lot of errors, you will see no change.
> >
> >Makes sense.
> >
> >AMD RevF can do this using the threshold interrupts too for DIMM errors
> >too without any delays -- perhaps it would also make sense to configure
> >this by default that it always triggers on all DIMM errors.
> >Right now it is just an option in /sys
> 
> Can I look at this as a followon patch?  I have a number of mce

Sure.

-Andi
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