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Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is set.

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From: Andi Kleen
Subject: Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is set.
Date: Friday, October 24, 2008 - 12:34 pm

On Fri, Oct 24, 2008 at 12:19:41PM -0700, H. Peter Anvin wrote:

The people running on older hypervisors will just continue using
PIT timer. They won't get nohz, but i guess without updates
they don't expect new features.


Hardware vendors can't fix it without long lead time.
Software vendors can as easily as Linux.

Also we're talking about an optimization here (enabling NOHZ), not a 
correctness issue. So your analogy to hardware workarounds
is already dubious.

-Andi
-- 
ak@linux.intel.com
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Messages in current thread:
[PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Mon Oct 20, 6:35 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Chris Snook, (Mon Oct 20, 10:55 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Andi Kleen, (Tue Oct 21, 2:43 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Pavel Machek, (Tue Oct 21, 2:50 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 9:41 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 9:48 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Andi Kleen, (Tue Oct 21, 10:40 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 11:04 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Andi Kleen, (Tue Oct 21, 11:15 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Pavel Machek, (Tue Oct 21, 11:36 am)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 12:10 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 12:11 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Andi Kleen, (Tue Oct 21, 12:27 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 12:47 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Tue Oct 21, 2:41 pm)
[PATCH] Skip tsc synchronization checks if CONSTANT_TSC bi ..., Alok Kataria, (Wed Oct 22, 12:23 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Ingo Molnar, (Wed Oct 22, 12:26 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Alok Kataria, (Wed Oct 22, 12:26 pm)
Re: [PATCH 0/3] Improve TSC as a clocksource under VMware, Jeff Hansen, (Wed Oct 22, 12:29 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 12:30 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Wed Oct 22, 12:58 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Wed Oct 22, 1:17 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 3:00 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 3:04 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 3:11 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Wed Oct 22, 3:13 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alan Cox, (Wed Oct 22, 3:15 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 3:17 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Wed Oct 22, 3:54 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Wed Oct 22, 7:21 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Thu Oct 23, 1:10 am)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Thu Oct 23, 4:39 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., H. Peter Anvin, (Thu Oct 23, 4:47 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Thu Oct 23, 5:25 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., H. Peter Anvin, (Thu Oct 23, 5:46 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Thu Oct 23, 6:12 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., H. Peter Anvin, (Thu Oct 23, 6:18 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Fri Oct 24, 12:23 am)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., H. Peter Anvin, (Fri Oct 24, 8:30 am)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., H. Peter Anvin, (Fri Oct 24, 12:19 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Fri Oct 24, 12:25 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Andi Kleen, (Fri Oct 24, 12:34 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Alok Kataria, (Fri Oct 24, 12:50 pm)
Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TS ..., Dan Hecht, (Fri Oct 24, 1:18 pm)