Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug

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From: H. Peter Anvin
Date: Thursday, August 14, 2008 - 10:17 am

Mathieu Desnoyers wrote:

Actually, unless I have blown my T-test completely, they show with a 80% 
and 74% confidence (respective for the two benchmarks) that the DS case 
is slightly *better* (0.26% and 0.20% better, respective), which makes 
it a no-brainer.  Doing around 10 runs of each is likely to confirm this 
conclusion by pushing it into the 90+% interval.

Note that since the difference is so small, and so can also be due to 
some kind of systematic error (lower ambient temperature during the DS 
run making the disk drive slightly faster, what have you.)

	-hpa
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Messages in current thread:
[PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 11:20 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Thu Aug 7, 11:47 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 1:42 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Jeremy Fitzhardinge, (Thu Aug 7, 2:11 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 2:29 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Roland McGrath, (Thu Aug 7, 3:26 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 6:21 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 6:24 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Thu Aug 7, 6:56 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Sam Ravnborg, (Thu Aug 7, 9:54 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Peter Zijlstra, (Fri Aug 8, 12:22 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 4:31 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Fri Aug 8, 10:22 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 10:36 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Fri Aug 8, 10:46 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 11:13 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Peter Zijlstra, (Fri Aug 8, 11:15 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Fri Aug 8, 11:21 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 11:41 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Linus Torvalds, (Fri Aug 8, 12:04 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Fri Aug 8, 12:05 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Jeremy Fitzhardinge, (Fri Aug 8, 12:08 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 4:38 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Andi Kleen, (Fri Aug 8, 5:23 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 5:30 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 5:36 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Jeremy Fitzhardinge, (Fri Aug 8, 5:47 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Linus Torvalds, (Fri Aug 8, 5:51 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 5:51 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Roland McGrath, (Fri Aug 8, 5:53 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Andi Kleen, (Fri Aug 8, 6:13 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Andi Kleen, (Fri Aug 8, 6:19 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 6:25 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 6:30 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Andi Kleen, (Fri Aug 8, 6:55 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 7:03 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Andi Kleen, (Fri Aug 8, 7:23 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Fri Aug 8, 9:12 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Abhishek Sagar, (Sat Aug 9, 2:48 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Sat Aug 9, 6:01 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Abhishek Sagar, (Sat Aug 9, 8:01 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Sat Aug 9, 8:37 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Abhishek Sagar, (Sat Aug 9, 10:14 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Rusty Russell, (Sun Aug 10, 7:41 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Mon Aug 11, 5:33 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Mon Aug 11, 11:21 am)
Re: [PATCH 0/5] ftrace: to kill a daemon, Steven Rostedt, (Mon Aug 11, 12:28 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Tue Aug 12, 11:31 pm)
Re: [PATCH 0/5] ftrace: to kill a daemon, Mathieu Desnoyers, (Wed Aug 13, 8:38 am)
Efficient x86 and x86_64 NOP microbenchmarks, Mathieu Desnoyers, (Wed Aug 13, 10:52 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Linus Torvalds, (Wed Aug 13, 11:27 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Andi Kleen, (Wed Aug 13, 11:41 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Avi Kivity, (Wed Aug 13, 11:45 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Andi Kleen, (Wed Aug 13, 11:51 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Avi Kivity, (Wed Aug 13, 11:56 am)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Mathieu Desnoyers, (Wed Aug 13, 12:16 pm)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Mathieu Desnoyers, (Wed Aug 13, 12:30 pm)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Andi Kleen, (Wed Aug 13, 12:37 pm)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Mathieu Desnoyers, (Wed Aug 13, 1:01 pm)
[RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with p ..., Mathieu Desnoyers, (Wed Aug 13, 4:41 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Wed Aug 13, 6:13 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Wed Aug 13, 6:22 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Wed Aug 13, 6:49 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Wed Aug 13, 8:35 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 8:18 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 9:58 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 10:04 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 10:05 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., H. Peter Anvin, (Thu Aug 14, 10:17 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 10:28 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 10:30 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 10:43 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 10:46 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 10:49 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 10:55 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 11:09 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 11:53 am)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 12:29 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 12:49 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Mathieu Desnoyers, (Thu Aug 14, 1:31 pm)
Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race wi ..., Jeremy Fitzhardinge, (Thu Aug 14, 2:46 pm)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Steven Rostedt, (Fri Aug 15, 2:34 pm)
Re: Efficient x86 and x86_64 NOP microbenchmarks, Andi Kleen, (Fri Aug 15, 2:51 pm)