From: Andi Kleen <ak@suse.de>
To: Hans Boehm <Hans.Boehm@hp.com>
Cc: Christoph Lameter <clameter@sgi.com>,
Zoltan Menyhart <Zoltan.Menyhart@bull.net>,
"Grundler, Grant G" <grant.grundler@hp.com>,
"Chen, Kenneth W" <kenneth.w.chen@intel.com>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org
Subject: Re: Synchronizing Bit operations V2
Date: Fri, 31 Mar 2006 16:37:33 +0000 [thread overview]
Message-ID: <200603311837.34477.ak@suse.de> (raw)
In-Reply-To: <Pine.GHP.4.58.0603310808190.28478@tomil.hpl.hp.com>
On Friday 31 March 2006 18:22, Hans Boehm wrote:
> My impression is that approach (1) tends not to stick, since it involves
> a substantial performance hit on architectures on which the fence is
> not implicitly included in atomic operations. Those include Itanium and
> PowerPC.
At least the PPC people are eating the overhead because back when they
didn't they had a long string of subtle powerpc only bugs caused by that
It's a stability/maintainability vs performance issue. I doubt the
performance advantage would be worth the additional work. I guess
with the engineering time you would need to spend getting all this right
you could do much more fruitful optimizations.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Hans Boehm <Hans.Boehm@hp.com>
Cc: Christoph Lameter <clameter@sgi.com>,
Zoltan Menyhart <Zoltan.Menyhart@bull.net>,
"Grundler, Grant G" <grant.grundler@hp.com>,
"Chen, Kenneth W" <kenneth.w.chen@intel.com>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
linux-ia64@vger.kernel.org
Subject: Re: Synchronizing Bit operations V2
Date: Fri, 31 Mar 2006 18:37:33 +0200 [thread overview]
Message-ID: <200603311837.34477.ak@suse.de> (raw)
In-Reply-To: <Pine.GHP.4.58.0603310808190.28478@tomil.hpl.hp.com>
On Friday 31 March 2006 18:22, Hans Boehm wrote:
> My impression is that approach (1) tends not to stick, since it involves
> a substantial performance hit on architectures on which the fence is
> not implicitly included in atomic operations. Those include Itanium and
> PowerPC.
At least the PPC people are eating the overhead because back when they
didn't they had a long string of subtle powerpc only bugs caused by that
It's a stability/maintainability vs performance issue. I doubt the
performance advantage would be worth the additional work. I guess
with the engineering time you would need to spend getting all this right
you could do much more fruitful optimizations.
-Andi
next prev parent reply other threads:[~2006-03-31 16:37 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-30 21:02 Bit operations with the ability to specify a synchronization mode Christoph Lameter
2006-03-30 21:02 ` Christoph Lameter
2006-03-31 0:18 ` Synchronizing Bit operations V2 Christoph Lameter
2006-03-31 0:18 ` Christoph Lameter
2006-03-31 0:39 ` Chen, Kenneth W
2006-03-31 0:39 ` Chen, Kenneth W
2006-03-31 0:42 ` Christoph Lameter
2006-03-31 0:42 ` Christoph Lameter
2006-03-31 0:45 ` Christoph Lameter
2006-03-31 0:45 ` Christoph Lameter
2006-03-31 0:42 ` David Mosberger-Tang
2006-03-31 0:42 ` David Mosberger-Tang
2006-03-31 0:49 ` Christoph Lameter
2006-03-31 0:49 ` Christoph Lameter
2006-03-31 6:10 ` Chris Wright
2006-03-31 6:10 ` Chris Wright
2006-03-31 0:44 ` Nick Piggin
2006-03-31 0:44 ` Nick Piggin
2006-03-31 3:28 ` Christoph Lameter
2006-03-31 3:28 ` Christoph Lameter
2006-03-31 4:12 ` Nick Piggin
2006-03-31 4:12 ` Nick Piggin
2006-03-31 17:43 ` Christoph Lameter
2006-03-31 17:43 ` Christoph Lameter
2006-04-01 2:56 ` Nick Piggin
2006-04-01 2:56 ` Nick Piggin
2006-03-31 0:50 ` Chen, Kenneth W
2006-03-31 0:50 ` Chen, Kenneth W
2006-03-31 0:51 ` Christoph Lameter
2006-03-31 0:51 ` Christoph Lameter
2006-03-31 0:53 ` Chen, Kenneth W
2006-03-31 0:53 ` Chen, Kenneth W
2006-03-31 0:55 ` Christoph Lameter
2006-03-31 0:55 ` Christoph Lameter
2006-03-31 0:56 ` Luck, Tony
2006-03-31 0:56 ` Luck, Tony
2006-03-31 0:58 ` Christoph Lameter
2006-03-31 0:58 ` Christoph Lameter
2006-04-02 7:59 ` Russell King
2006-04-02 7:59 ` Russell King
2006-03-31 0:59 ` Chen, Kenneth W
2006-03-31 0:59 ` Chen, Kenneth W
2006-03-31 1:09 ` Christoph Lameter
2006-03-31 1:09 ` Christoph Lameter
2006-03-31 1:04 ` Chen, Kenneth W
2006-03-31 1:04 ` Chen, Kenneth W
2006-03-31 1:13 ` Christoph Lameter
2006-03-31 1:13 ` Christoph Lameter
2006-03-31 1:13 ` Chen, Kenneth W
2006-03-31 1:13 ` Chen, Kenneth W
2006-03-31 1:29 ` Chen, Kenneth W
2006-03-31 1:29 ` Chen, Kenneth W
2006-03-31 1:37 ` Christoph Lameter
2006-03-31 1:37 ` Christoph Lameter
2006-03-31 1:33 ` linux
2006-03-31 1:33 ` linux
2006-03-31 1:40 ` Christoph Lameter
2006-03-31 1:40 ` Christoph Lameter
2006-03-31 2:35 ` Chen, Kenneth W
2006-03-31 2:35 ` Chen, Kenneth W
2006-03-31 2:37 ` Christoph Lameter
2006-03-31 2:37 ` Christoph Lameter
2006-03-31 2:45 ` Chen, Kenneth W
2006-03-31 2:45 ` Chen, Kenneth W
2006-03-31 2:53 ` Nick Piggin
2006-03-31 2:53 ` Nick Piggin
2006-03-31 3:01 ` Christoph Lameter
2006-03-31 3:01 ` Christoph Lameter
2006-03-31 2:51 ` Chen, Kenneth W
2006-03-31 2:51 ` Chen, Kenneth W
2006-03-31 2:55 ` Christoph Lameter
2006-03-31 2:55 ` Christoph Lameter
2006-03-31 3:02 ` Chen, Kenneth W
2006-03-31 3:02 ` Chen, Kenneth W
2006-03-31 3:08 ` Christoph Lameter
2006-03-31 3:08 ` Christoph Lameter
2006-03-31 3:10 ` Chen, Kenneth W
2006-03-31 3:10 ` Chen, Kenneth W
2006-03-31 3:12 ` Christoph Lameter
2006-03-31 3:12 ` Christoph Lameter
2006-03-31 3:11 ` Chen, Kenneth W
2006-03-31 3:11 ` Chen, Kenneth W
2006-03-31 3:14 ` Chen, Kenneth W
2006-03-31 3:14 ` Chen, Kenneth W
2006-03-31 3:20 ` Christoph Lameter
2006-03-31 3:20 ` Christoph Lameter
2006-03-31 3:17 ` Chen, Kenneth W
2006-03-31 3:17 ` Chen, Kenneth W
2006-03-31 3:23 ` Chen, Kenneth W
2006-03-31 3:23 ` Chen, Kenneth W
2006-03-31 3:37 ` Chen, Kenneth W
2006-03-31 3:37 ` Chen, Kenneth W
2006-03-31 6:15 ` Chen, Kenneth W
2006-03-31 6:15 ` Chen, Kenneth W
2006-03-31 7:34 ` Nick Piggin
2006-03-31 7:34 ` Nick Piggin
2006-03-31 13:28 ` Andi Kleen
2006-03-31 13:28 ` Andi Kleen
2006-03-31 16:22 ` Hans Boehm
2006-03-31 16:22 ` Hans Boehm
2006-03-31 16:37 ` Andi Kleen [this message]
2006-03-31 16:37 ` Andi Kleen
2006-03-31 17:46 ` Christoph Lameter
2006-03-31 17:46 ` Christoph Lameter
2006-03-31 17:45 ` Christoph Lameter
2006-03-31 17:45 ` Christoph Lameter
2006-03-31 17:48 ` Andi Kleen
2006-03-31 17:48 ` Andi Kleen
2006-03-31 17:56 ` Christoph Lameter
2006-03-31 17:56 ` Christoph Lameter
2006-04-02 7:54 ` Russell King
2006-04-02 7:54 ` Russell King
2006-03-31 18:57 ` Chen, Kenneth W
2006-03-31 18:57 ` Chen, Kenneth W
2006-03-31 19:41 ` Chen, Kenneth W
2006-03-31 19:41 ` Chen, Kenneth W
2006-03-31 21:15 ` Christoph Lameter
2006-03-31 21:15 ` Christoph Lameter
2006-03-31 21:24 ` Chen, Kenneth W
2006-03-31 21:24 ` Chen, Kenneth W
2006-03-31 21:28 ` Christoph Lameter
2006-03-31 21:28 ` Christoph Lameter
2006-04-01 2:16 ` Nick Piggin
2006-04-01 2:16 ` Nick Piggin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200603311837.34477.ak@suse.de \
--to=ak@suse.de \
--cc=Hans.Boehm@hp.com \
--cc=Zoltan.Menyhart@bull.net \
--cc=akpm@osdl.org \
--cc=clameter@sgi.com \
--cc=grant.grundler@hp.com \
--cc=kenneth.w.chen@intel.com \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.