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Re: [patch] clockevents: Reinstate the per cpu tick skew

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To: Mike Galbraith <efault@xxxxxx>
Subject: Re: [patch] clockevents: Reinstate the per cpu tick skew
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Date: Wed, 28 Dec 2011 17:57:24 +0100
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>, RT <linux-rt-users@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>
In-reply-to: <1325084349.16165.22.camel@marge.simson.net>
References: <1324717569.5025.73.camel@marge.simson.net> <1324968044.5217.103.camel@marge.simson.net> <1324977605.5217.132.camel@marge.simson.net> <1325049448.4726.16.camel@marge.simson.net> <4EFB1B28.7090203@linux.intel.com> <1325084349.16165.22.camel@marge.simson.net>

On Wed, 2011-12-28 at 15:59 +0100, Mike Galbraith wrote:
> 
> > (and are you using a system where tsc/lapic can be used, or are you
> > using one of those boatanchors that need hpet?)
> 
> Box is an HP DL980, 64 x X7560. 

That smells like NHM-EX, aka boatanchor.

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Follow-Ups:
- Re: [patch] clockevents: Reinstate the per cpu tick skew
  - From: Mike Galbraith

References:
- 3.0.14-rt31 + 64 cores = very bad jitter == highly synchronized tick?
  - From: Mike Galbraith
- Re: 3.0.14-rt31 + 64 cores = very bad jitter == highly synchronized tick?
  - From: Mike Galbraith
- [patch] clockevents: Reinstate the per cpu tick skew
  - From: Mike Galbraith
- Re: [patch] clockevents: Reinstate the per cpu tick skew
  - From: Mike Galbraith
- Re: [patch] clockevents: Reinstate the per cpu tick skew
  - From: Arjan van de Ven
- Re: [patch] clockevents: Reinstate the per cpu tick skew
  - From: Mike Galbraith

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