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Re: [patch 10/10] Scheduler profiling - Use immediate values

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From: Andi Kleen
Subject: Re: [patch 10/10] Scheduler profiling - Use immediate values
Date: Friday, July 6, 2007 - 1:03 pm

On Fri, Jul 06, 2007 at 10:50:30AM -0700, Li, Tong N wrote:
                                                    ^^^^^^^

I meant L2 cache hit of course



I found that memory latency is difficult to measure in modern x86
CPUs because they have very clever prefetchers that can often
outwit benchmarks.

Another trap on P4 is that RDTSC is actually quite slow and synchronizes
the CPU; that can add large measurement errors.

-Andi

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Messages in current thread:
[patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Tue Jul 3, 9:40 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Alexey Dobriyan, (Tue Jul 3, 11:11 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Tue Jul 3, 11:57 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Wed Jul 4, 7:23 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Alexey Dobriyan, (Wed Jul 4, 1:31 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Alexey Dobriyan, (Wed Jul 4, 1:35 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Andi Kleen, (Wed Jul 4, 3:41 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Andrew Morton, (Thu Jul 5, 1:21 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Andrew Morton, (Thu Jul 5, 1:29 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Thu Jul 5, 1:41 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Andi Kleen, (Fri Jul 6, 4:44 am)
RE: [patch 10/10] Scheduler profiling - Use immediate values, Li, Tong N, (Fri Jul 6, 10:50 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Andi Kleen, (Fri Jul 6, 1:03 pm)
RE: [patch 10/10] Scheduler profiling - Use immediate values, Li, Tong N, (Fri Jul 6, 1:57 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Fri Jul 6, 2:03 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Chuck Ebbert, (Fri Jul 6, 3:14 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Fri Jul 6, 4:28 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Dave Jones, (Fri Jul 6, 4:38 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Fri Jul 6, 4:43 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Fri Jul 6, 5:10 pm)
Re: [patch 10/10] *Tests* Scheduler profiling - Use immedi ..., Mathieu Desnoyers, (Fri Jul 6, 6:50 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Fri Jul 6, 7:25 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Mathieu Desnoyers, (Fri Jul 6, 7:35 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Fri Jul 6, 9:03 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Willy Tarreau, (Fri Jul 6, 10:02 pm)
RE: [patch 10/10] *Tests* Scheduler profiling - Use immedi ..., Li, Tong N, (Fri Jul 6, 11:08 pm)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Frank Ch. Eigler, (Sat Jul 7, 8:45 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Sat Jul 7, 10:01 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Willy Tarreau, (Sat Jul 7, 10:20 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Frank Ch. Eigler, (Sat Jul 7, 10:55 am)
Re: [patch 10/10] Scheduler profiling - Use immediate values, Adrian Bunk, (Sat Jul 7, 10:59 am)
Re: [patch 10/10] *Tests* Scheduler profiling - Use immedi ..., Mathieu Desnoyers, (Tue Jul 10, 10:02 pm)