Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag | KernelTrap

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag

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From: Michael Matz

Subject: Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag

Date: Friday, March 7, 2008 - 7:09 am

Hi,

On Thu, 6 Mar 2008, Andi Kleen wrote:

quoted text> To be realistic it is very unlikely anybody will measure a difference 
> from a few more or a few less clds in a program.

Only an assumption, and in fact wrong.  See upthread for a benchmark.  
IIRC Uros also made measurements to justify the removal of cld (on P4 I 
think), where it helps tremendously on small memcpy loops.


Ciao,
Michael.
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Messages in current thread:

Linux doesn't follow x86/x86-64 ABI wrt direction flag, Aurelien Jarno, (Wed Mar 5, 8:30 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, H. Peter Anvin, (Wed Mar 5, 9:00 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, H.J. Lu, (Wed Mar 5, 9:56 am)

[PATCH] x86: Clear DF before calling signal handler, Aurelien Jarno, (Wed Mar 5, 11:14 am)

Re: [PATCH] x86: Clear DF before calling signal handler, H. Peter Anvin, (Wed Mar 5, 11:17 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Joe Buck, (Wed Mar 5, 12:58 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Aurelien Jarno, (Wed Mar 5, 1:23 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Michael Matz, (Wed Mar 5, 1:38 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Joe Buck, (Wed Mar 5, 1:42 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, H. Peter Anvin, (Wed Mar 5, 1:44 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Jan Hubicka, (Wed Mar 5, 1:49 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Aurelien Jarno, (Wed Mar 5, 1:52 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Michael Matz, (Wed Mar 5, 2:02 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, H. Peter Anvin, (Wed Mar 5, 2:07 pm)

RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt d ..., Joe Buck, (Wed Mar 5, 2:20 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, David Miller, (Wed Mar 5, 2:23 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Richard Guenther, (Wed Mar 5, 2:32 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., H. Peter Anvin, (Wed Mar 5, 2:34 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Richard Guenther, (Wed Mar 5, 2:40 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Andrew Pinski, (Wed Mar 5, 2:43 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Joe Buck, (Wed Mar 5, 2:43 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Michael Matz, (Wed Mar 5, 2:43 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Richard Guenther, (Wed Mar 5, 2:44 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Aurelien Jarno, (Wed Mar 5, 2:45 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Joe Buck, (Wed Mar 5, 3:12 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., David Miller, (Wed Mar 5, 3:16 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., David Miller, (Wed Mar 5, 3:17 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Joe Buck, (Wed Mar 5, 3:37 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Michael Matz, (Wed Mar 5, 3:51 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., H. Peter Anvin, (Wed Mar 5, 3:58 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Michael Matz, (Wed Mar 5, 4:07 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., David Miller, (Wed Mar 5, 4:10 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Olivier Galibert, (Wed Mar 5, 4:12 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Joe Buck, (Wed Mar 5, 4:16 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Olivier Galibert, (Wed Mar 5, 4:17 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., David Daney, (Wed Mar 5, 4:21 pm)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Andi Kleen, (Thu Mar 6, 1:44 am)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Jakub Jelinek, (Thu Mar 6, 2:01 am)

Re: [PATCH] x86: Clear DF before calling signal handler, Ingo Molnar, (Thu Mar 6, 2:21 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Mikael Pettersson, (Thu Mar 6, 2:45 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Andrew Haley, (Thu Mar 6, 2:53 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Andi Kleen, (Thu Mar 6, 4:45 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Richard Guenther, (Thu Mar 6, 5:06 am)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Olivier Galibert, (Thu Mar 6, 7:06 am)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., H. Peter Anvin, (Thu Mar 6, 8:20 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Joe Buck, (Thu Mar 6, 10:34 am)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Richard Guenther, (Thu Mar 6, 1:54 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, H. Peter Anvin, (Thu Mar 6, 1:56 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Andi Kleen, (Thu Mar 6, 3:06 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Chris Lattner, (Thu Mar 6, 9:56 pm)

Re: Linux doesn't follow x86/x86-64 ABI wrt direction flag, Michael Matz, (Fri Mar 7, 7:09 am)

Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI w ..., Alexandre Oliva, (Sat Mar 8, 12:10 pm)

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