Re: [rfc][patch 2/3] x86: fix IO write barriers

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To: Andi Kleen <ak@...>
Cc: Nick Piggin <npiggin@...>, Linux Kernel Mailing List <linux-kernel@...>, Linus Torvalds <torvalds@...>
Date: Thursday, October 4, 2007 - 3:08 pm

On Thu, Oct 04, 2007 at 08:58:27PM +0200, Andi Kleen wrote:
 > On Thursday 04 October 2007 20:41:07 Dave Jones wrote:
 > > On Thu, Oct 04, 2007 at 08:21:59PM +0200, Andi Kleen wrote:
 > >  > On Thursday 04 October 2007 20:10:44 Dave Jones wrote:
 > >  > > On Thu, Oct 04, 2007 at 07:53:16PM +0200, Andi Kleen wrote:
 > >  > >  > 
 > >  > >  > > The only vendor that ever implemented OOSTOREs was Centaur, and they
 > >  > >  > > only did in the Winchip generation of the CPUs.  When they dropped it
 > >  > >  > > from the C3, I asked whether they intended to bring it back, and the
 > >  > >  > > answer was "extremely unlikely".
 > >  > >  > >
 > >  > >  > 
 > >  > >  > Do you know if it made a big performance difference?
 > >  > > 
 > >  > > On the winchip, it was a huge win. I can't remember exact numbers,
 > >  > > but pretty much every benchmark I threw at it at the time showed
 > >  > > significant improvement.
 > >  > 
 > >  > Significant as in >10%?
 > > 
 > > "Worth about 10-20% performance" according to the 2.4.18pre9-ac4
 > > release notes: http://www.linuxtoday.com/news_story.php3?ltsn=2002-02-14-015-20-NW-KN
 > 
 > Are there numbers for a newer kernel available too?

no idea, my winchips died about 5 years ago.

	Dave

-- 
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Messages in current thread:
[rfc][patch 1/3] x86_64: fence nontemproal stores, Nick Piggin, (Thu Oct 4, 1:21 am)
[rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Thu Oct 4, 1:23 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 4:25 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Linus Torvalds, (Fri Oct 12, 11:13 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Mon Oct 15, 3:44 am)
RE: [rfc][patch 3/3] x86: optimise barriers, David Schwartz, (Mon Oct 15, 10:38 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Mon Oct 15, 4:09 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Mon Oct 15, 5:10 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Mon Oct 15, 8:50 pm)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Tue Oct 16, 5:00 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Tue Oct 16, 8:49 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Mon Oct 15, 5:24 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Fri Oct 12, 4:57 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 5:55 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Fri Oct 12, 6:42 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 7:55 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 8:10 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Helge Hafting, (Fri Oct 12, 4:42 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 5:12 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Helge Hafting, (Fri Oct 12, 8:44 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 9:29 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Helge Hafting, (Mon Oct 15, 6:17 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Mon Oct 15, 7:53 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Nick Piggin, (Fri Oct 12, 5:44 am)
Re: [rfc][patch 3/3] x86: optimise barriers, Jarek Poplawski, (Fri Oct 12, 6:04 am)
[rfc][patch 2/3] x86: fix IO write barriers, Nick Piggin, (Thu Oct 4, 1:22 am)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Dave Jones, (Thu Oct 4, 1:32 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Andi Kleen, (Thu Oct 4, 1:53 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Dave Jones, (Thu Oct 4, 2:10 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Andi Kleen, (Thu Oct 4, 2:21 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Dave Jones, (Thu Oct 4, 2:41 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Andi Kleen, (Thu Oct 4, 2:58 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Dave Jones, (Thu Oct 4, 3:08 pm)
Re: [rfc][patch 2/3] x86: fix IO write barriers, Alan Cox, (Thu Oct 4, 4:52 pm)