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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: Wednesday, October 22, 2008 - 3:54 pm

> Not really, there are problems with the pm timer too, the one about

Well then pit. Or are you saying time is always broken on VMware & Linux?


But you don't seem to emulate it "ideal"ly otherwise you wouldn't
need all these hacks you're adding? 

I think you should either implement a TSC that matches what
real hardware does (including CPUID semantics) or implement
a real vmware PV timer and just say it's PV and not fully virtualized. 
But doesn't the vmware paravirt ops have that already anyways?

But I personally think it wouldn't really scale to add detection for 
more and more "nearly PV" hypervisors to the standard native kernel.

-Andi
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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)