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Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculation
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From:
Pavel Machek <pavel@...>
To: Alok Kataria <akataria@...>
Cc: Thomas Gleixner <tglx@...>, Ingo Molnar <mingo@...>, LKML <linux-kernel@...>, Dan Hecht <dhecht@...>, Tim Mann <mann@...>, Zachary Amsden <zach@...>, Sahil Rihan <srihan@...>
Subject:
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculation
Date: Wednesday, June 4, 2008 - 10:17 am
Hi!
quoted text
> @@ -123,6 +123,8 @@ > (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)) > cpu_khz = calculate_cpu_khz(); > > + lpj_tsc = ((unsigned long)cpu_khz * 1000)/HZ; > +
No. Some cpus do one loop per tick, some do two loops per tick, and there are probably weird cpus, too. Pavel -- (english)
http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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Messages in current thread:
[RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculation
, Alok Kataria
, (Tue Jun 3, 8:41 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Mon Jun 9, 9:11 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Mon Jun 9, 1:55 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Pavel Machek
, (Wed Jun 4, 10:17 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Arjan van de Ven
, (Tue Jun 3, 9:20 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok kataria
, (Wed Jun 4, 12:01 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Arjan van de Ven
, (Wed Jun 4, 9:16 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Thu Jun 19, 9:22 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Fri Jun 20, 7:39 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Fri Jun 20, 6:06 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Pavel Machek
, (Tue Jun 24, 1:57 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Thu Jun 26, 1:20 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Pavel Machek
, (Thu Jun 26, 1:35 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Thu Jun 26, 2:10 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Pavel Machek
, (Thu Jun 26, 6:16 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Thu Jun 26, 7:10 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Pavel Machek
, (Fri Jun 27, 4:12 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Mon Jun 23, 7:21 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Mon Jun 23, 7:34 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Mon Jun 23, 7:47 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Mon Jun 23, 9:21 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Tue Jun 24, 7:54 am)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Ingo Molnar
, (Mon Jun 23, 4:54 pm)
Re: [RFC PATCH] x86:Use cpu_khz for loops_per_jiffy calculat...
, Alok Kataria
, (Thu Jun 5, 2:37 pm)
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