From: Christoph Lameter <christoph@lameter.com>
To: Matthew Wilcox <willy@debian.org>
Cc: Christoph Lameter <clameter@sgi.com>,
William Lee Irwin III <wli@holomorphy.com>,
"David S. Miller" <davem@redhat.com>,
raybry@sgi.com, ak@muc.de, benh@kernel.crashing.org,
manfred@colorfullife.com, linux-ia64@vger.kernel.org,
linux-kernel@vger.kernel.org, vrajesh@umich.edu
Subject: Re: page fault scalability patch v3: use cmpxchg, make rss atomic
Date: Tue, 24 Aug 2004 14:47:39 +0000 [thread overview]
Message-ID: <Pine.LNX.4.58.0408240743180.3853@server.home> (raw)
In-Reply-To: <20040824123416.GL9660@parcelfarce.linux.theplanet.co.uk>
On Tue, 24 Aug 2004, Matthew Wilcox wrote:
> On Mon, Aug 23, 2004 at 10:49:31PM -0700, Christoph Lameter wrote:
> > Unpatched:
> > Gb Rep Threads User System Wall flt/cpu/s fault/wsec
> > 4 3 1 0.157s 11.197s 11.035s 69261.721 69239.940
> > 4 3 2 0.145s 11.445s 6.079s 67849.528 115681.409
> > 4 3 4 0.182s 13.894s 4.027s 55865.834 184108.856
> > 4 3 8 0.196s 24.874s 4.025s 31369.039 184790.767
> >
> > With page fault scalability patch:
> > Gb Rep Threads User System Wall flt/cpu/s fault/wsec
> > 4 3 1 0.176s 11.323s 11.050s 68385.368 68345.055
> > 4 3 2 0.174s 10.716s 5.096s 72205.329 131848.322
> > 4 3 4 0.170s 10.694s 3.040s 72380.552 231128.569
> > 4 3 8 0.177s 14.717s 2.064s 52796.567 297380.041
>
> What kind of variance are you seeing with this benchmark? I'm suspicious
> that your 2 thread case is faster than your single thread case.
What is so suspicious about it? Two CPUs can do the job faster than a
single one. Thats the way it should be and the point of these
patches is to reduce locking so that this can happen in a more efficient
way.
There are some variances in these tests especially if one uses low memory
settings such as 1GB 2GB and to some extend also at 4GB. 16 GB gives quite
stable results but the machine I had available for this only had 8 GB. See
my earlier posts on the subject for other test results.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <christoph@lameter.com>
To: Matthew Wilcox <willy@debian.org>
Cc: Christoph Lameter <clameter@sgi.com>,
William Lee Irwin III <wli@holomorphy.com>,
"David S. Miller" <davem@redhat.com>,
raybry@sgi.com, ak@muc.de, benh@kernel.crashing.org,
manfred@colorfullife.com, linux-ia64@vger.kernel.org,
linux-kernel@vger.kernel.org, vrajesh@umich.edu
Subject: Re: page fault scalability patch v3: use cmpxchg, make rss atomic
Date: Tue, 24 Aug 2004 07:47:39 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.58.0408240743180.3853@server.home> (raw)
In-Reply-To: <20040824123416.GL9660@parcelfarce.linux.theplanet.co.uk>
On Tue, 24 Aug 2004, Matthew Wilcox wrote:
> On Mon, Aug 23, 2004 at 10:49:31PM -0700, Christoph Lameter wrote:
> > Unpatched:
> > Gb Rep Threads User System Wall flt/cpu/s fault/wsec
> > 4 3 1 0.157s 11.197s 11.035s 69261.721 69239.940
> > 4 3 2 0.145s 11.445s 6.079s 67849.528 115681.409
> > 4 3 4 0.182s 13.894s 4.027s 55865.834 184108.856
> > 4 3 8 0.196s 24.874s 4.025s 31369.039 184790.767
> >
> > With page fault scalability patch:
> > Gb Rep Threads User System Wall flt/cpu/s fault/wsec
> > 4 3 1 0.176s 11.323s 11.050s 68385.368 68345.055
> > 4 3 2 0.174s 10.716s 5.096s 72205.329 131848.322
> > 4 3 4 0.170s 10.694s 3.040s 72380.552 231128.569
> > 4 3 8 0.177s 14.717s 2.064s 52796.567 297380.041
>
> What kind of variance are you seeing with this benchmark? I'm suspicious
> that your 2 thread case is faster than your single thread case.
What is so suspicious about it? Two CPUs can do the job faster than a
single one. Thats the way it should be and the point of these
patches is to reduce locking so that this can happen in a more efficient
way.
There are some variances in these tests especially if one uses low memory
settings such as 1GB 2GB and to some extend also at 4GB. 16 GB gives quite
stable results but the machine I had available for this only had 8 GB. See
my earlier posts on the subject for other test results.
next prev parent reply other threads:[~2004-08-24 14:47 UTC|newest]
Thread overview: 195+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-15 13:50 page fault fastpath: Increasing SMP scalability by introducing pte Christoph Lameter
2004-08-15 13:50 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-15 20:09 ` page fault fastpath: Increasing SMP scalability by introducing David S. Miller
2004-08-15 20:09 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? David S. Miller
2004-08-15 22:58 ` page fault fastpath: Increasing SMP scalability by introducing Christoph Lameter
2004-08-15 22:58 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-15 23:58 ` page fault fastpath: Increasing SMP scalability by introducing David S. Miller
2004-08-15 23:58 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? David S. Miller
2004-08-16 0:11 ` page fault fastpath: Increasing SMP scalability by introducing Christoph Lameter
2004-08-16 0:11 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-16 1:56 ` page fault fastpath: Increasing SMP scalability by introducing David S. Miller
2004-08-16 1:56 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? David S. Miller
2004-08-16 3:29 ` page fault fastpath: Increasing SMP scalability by introducing Christoph Lameter
2004-08-16 3:29 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-16 6:59 ` page fault fastpath: Increasing SMP scalability by introducing Ray Bryant
2004-08-16 7:00 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Ray Bryant
2004-08-16 15:18 ` page fault fastpath: Increasing SMP scalability by introducing Christoph Lameter
2004-08-16 15:18 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-16 16:18 ` William Lee Irwin III
2004-08-16 16:18 ` William Lee Irwin III
2004-08-16 14:39 ` William Lee Irwin III
2004-08-16 14:39 ` William Lee Irwin III
2004-08-17 15:28 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 Christoph Lameter
2004-08-17 15:28 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP Christoph Lameter
2004-08-17 15:37 ` Christoph Hellwig
2004-08-17 15:37 ` Christoph Hellwig
2004-08-17 15:51 ` William Lee Irwin III
2004-08-17 15:51 ` William Lee Irwin III
2004-08-18 17:55 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 Hugh Dickins
2004-08-18 17:55 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP Hugh Dickins
2004-08-18 20:20 ` William Lee Irwin III
2004-08-18 20:20 ` William Lee Irwin III
2004-08-19 1:19 ` page fault fastpath patch v2: fix race conditions, stats for Christoph Lameter
2004-08-19 1:19 ` page fault fastpath patch v2: fix race conditions, stats for 8,32 and 512 cpu SMP Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B679F@mtv-atc-605e--n.corp.sgi.com>
2004-08-24 4:43 ` page fault scalability patch v3: use cmpxchg, make rss atomic Christoph Lameter
2004-08-24 4:43 ` Christoph Lameter
2004-08-24 5:49 ` Christoph Lameter
2004-08-24 5:49 ` Christoph Lameter
2004-08-24 12:34 ` Matthew Wilcox
2004-08-24 12:34 ` Matthew Wilcox
2004-08-24 14:47 ` Christoph Lameter [this message]
2004-08-24 14:47 ` Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B67A9@mtv-atc-605e--n.corp.sgi.com>
2004-08-26 15:20 ` page fault scalability patch v4: reduce page_table_lock use, atomic Christoph Lameter
2004-08-26 15:20 ` page fault scalability patch v4: reduce page_table_lock use, atomic pmd,pgd handlin Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA3129027B67B4@mtv-atc-605e--n.corp.sgi.com>
2004-08-27 23:20 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-08-27 23:20 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-27 23:36 ` Andi Kleen
2004-08-27 23:36 ` Andi Kleen
2004-08-27 23:43 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-08-27 23:43 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-08-28 0:19 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-08-28 0:19 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-28 0:23 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-08-28 0:23 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-08-28 0:36 ` page fault scalability patch final : i386 tested, x86_64 Andrew Morton
2004-08-28 0:36 ` page fault scalability patch final : i386 tested, x86_64 support added Andrew Morton
2004-08-28 0:40 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-08-28 0:40 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-08-28 1:05 ` Andi Kleen
2004-08-28 1:05 ` Andi Kleen
2004-08-28 1:11 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-08-28 1:11 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-08-28 1:17 ` Andi Kleen
2004-08-28 1:17 ` Andi Kleen
2004-08-28 1:02 ` Andi Kleen
2004-08-28 1:02 ` Andi Kleen
2004-08-28 1:39 ` page fault scalability patch final : i386 tested, x86_64 Andrew Morton
2004-08-28 1:39 ` page fault scalability patch final : i386 tested, x86_64 support added Andrew Morton
2004-08-28 2:08 ` page fault scalability patch final : i386 tested, x86_64 Paul Mackerras
2004-08-28 2:08 ` page fault scalability patch final : i386 tested, x86_64 support added Paul Mackerras
2004-08-28 3:32 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-08-28 3:32 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-28 3:42 ` page fault scalability patch final : i386 tested, x86_64 Andrew Morton
2004-08-28 3:42 ` page fault scalability patch final : i386 tested, x86_64 support added Andrew Morton
2004-08-28 4:24 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-08-28 4:24 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-28 5:39 ` page fault scalability patch final : i386 tested, x86_64 Andrew Morton
2004-08-28 5:39 ` page fault scalability patch final : i386 tested, x86_64 support added Andrew Morton
2004-08-28 5:58 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-08-28 5:58 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-08-28 6:03 ` William Lee Irwin III
2004-08-28 6:03 ` William Lee Irwin III
2004-08-28 6:06 ` page fault scalability patch final : i386 tested, x86_64 Andrew Morton
2004-08-28 6:06 ` page fault scalability patch final : i386 tested, x86_64 support added Andrew Morton
2004-08-30 17:02 ` Herbert Poetzl
2004-08-30 17:02 ` Herbert Poetzl
2004-08-30 17:05 ` Andi Kleen
2004-08-30 17:05 ` Andi Kleen
2004-08-28 13:19 ` page fault scalability patch final : i386 tested, x86_64 Andi Kleen
2004-08-28 13:19 ` page fault scalability patch final : i386 tested, x86_64 support added Andi Kleen
2004-08-28 15:48 ` Matt Mackall
2004-08-28 15:48 ` Matt Mackall
2004-09-01 4:13 ` page fault scalability patch final : i386 tested, x86_64 Benjamin Herrenschmidt
2004-09-01 4:13 ` page fault scalability patch final : i386 tested, x86_64 support added Benjamin Herrenschmidt
2004-09-02 21:26 ` Andi Kleen
2004-09-02 21:26 ` Andi Kleen
2004-09-02 21:55 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-09-02 21:55 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-09-01 18:03 ` Matthew Wilcox
2004-09-01 18:19 ` Andrew Morton
2004-09-01 19:06 ` William Lee Irwin III
2004-08-28 21:41 ` Daniel Phillips
2004-08-28 21:41 ` Daniel Phillips
2004-09-01 4:24 ` page fault scalability patch final : i386 tested, x86_64 Benjamin Herrenschmidt
2004-09-01 4:24 ` page fault scalability patch final : i386 tested, x86_64 support added Benjamin Herrenschmidt
2004-09-01 5:22 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-09-01 5:22 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-09-01 16:43 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-09-01 16:43 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-09-01 23:09 ` page fault scalability patch final : i386 tested, x86_64 Benjamin Herrenschmidt
2004-09-01 23:09 ` page fault scalability patch final : i386 tested, x86_64 support added Benjamin Herrenschmidt
[not found] ` <Pine.LNX.4.58.0409012140440.23186@schroedinger.engr.sgi.com>
[not found] ` <20040901215741.3538bbf4.davem@davemloft.net>
2004-09-02 5:18 ` William Lee Irwin III
2004-09-02 5:18 ` William Lee Irwin III
2004-09-09 15:38 ` page fault scalability patch: V7 (+fallback for atomic page table Christoph Lameter
2004-09-09 15:38 ` page fault scalability patch: V7 (+fallback for atomic page table ops) Christoph Lameter
2004-09-02 16:24 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-09-02 16:24 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-09-02 20:10 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-09-02 20:10 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-09-02 21:02 ` page fault scalability patch final : i386 tested, x86_64 support Christoph Lameter
2004-09-02 21:02 ` page fault scalability patch final : i386 tested, x86_64 support added Christoph Lameter
2004-09-02 21:07 ` page fault scalability patch final : i386 tested, x86_64 David S. Miller
2004-09-02 21:07 ` page fault scalability patch final : i386 tested, x86_64 support added David S. Miller
2004-09-18 23:23 ` page fault scalability patch V8: [0/7] Description Christoph Lameter
2004-09-18 23:23 ` Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA312902CD3243@mtv-atc-605e--n.corp.sgi.com>
2004-09-18 23:24 ` page fault scalability patch V8: [1/7] make mm->rss atomic Christoph Lameter
2004-09-18 23:24 ` Christoph Lameter
2004-09-18 23:26 ` page fault scalability patch V8: [2/7] avoid page_table_lock in Christoph Lameter
2004-09-18 23:26 ` page fault scalability patch V8: [2/7] avoid page_table_lock in handle_mm_fault Christoph Lameter
2004-09-19 9:04 ` Christoph Hellwig
2004-09-19 9:04 ` Christoph Hellwig
2004-09-18 23:27 ` page fault scalability patch V8: [3/7] atomic pte operations for Christoph Lameter
2004-09-18 23:27 ` page fault scalability patch V8: [3/7] atomic pte operations for ia64 Christoph Lameter
2004-09-18 23:28 ` page fault scalability patch V8: [4/7] universally available cmpxchg Christoph Lameter
2004-09-18 23:28 ` page fault scalability patch V8: [4/7] universally available cmpxchg on i386 Christoph Lameter
[not found] ` <200409191430.37444.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-19 12:11 ` Andi Kleen
2004-09-19 12:11 ` Andi Kleen
2004-09-20 15:45 ` page fault scalability patch V8: [4/7] universally available Christoph Lameter
2004-09-20 15:45 ` page fault scalability patch V8: [4/7] universally available cmpxchg on i386 Christoph Lameter
[not found] ` <200409202043.00580.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-20 20:49 ` page fault scalability patch V8: [4/7] universally available Christoph Lameter
2004-09-20 20:49 ` page fault scalability patch V8: [4/7] universally available cmpxchg on i386 Christoph Lameter
2004-09-20 20:57 ` Andi Kleen
2004-09-20 20:57 ` Andi Kleen
[not found] ` <200409211841.25507.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-21 15:45 ` Andi Kleen
2004-09-21 15:45 ` Andi Kleen
[not found] ` <200409212306.38800.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-21 20:14 ` Andi Kleen
2004-09-21 20:14 ` Andi Kleen
2004-09-23 7:17 ` page fault scalability patch V8: [4/7] universally available Andy Lutomirski
2004-09-23 7:17 ` page fault scalability patch V8: [4/7] universally available cmpxchg on i386 Andy Lutomirski
2004-09-23 9:03 ` Andi Kleen
2004-09-23 9:03 ` Andi Kleen
2004-09-27 19:06 ` page fault scalability patch V9: [0/7] overview Christoph Lameter
2004-10-15 19:02 ` page fault scalability patch V10: " Christoph Lameter
2004-10-15 19:02 ` Christoph Lameter
2004-10-15 19:03 ` page fault scalability patch V10: [1/7] make rss atomic Christoph Lameter
2004-10-15 19:03 ` Christoph Lameter
2004-10-15 19:04 ` page fault scalability patch V10: [2/7] defer/omit taking page_table_lock Christoph Lameter
2004-10-15 19:04 ` Christoph Lameter
2004-10-15 20:00 ` Marcelo Tosatti
2004-10-15 20:00 ` Marcelo Tosatti
2004-10-18 15:59 ` page fault scalability patch V10: [2/7] defer/omit taking Christoph Lameter
2004-10-18 15:59 ` page fault scalability patch V10: [2/7] defer/omit taking page_table_lock Christoph Lameter
2004-10-19 5:25 ` [revised] page fault scalability patch V10: [2/7] defer/omit taking Christoph Lameter
2004-10-19 5:25 ` [revised] page fault scalability patch V10: [2/7] defer/omit taking page_table_lock Christoph Lameter
2004-10-15 19:05 ` page fault scalability patch V10: [3/7] IA64 atomic pte operations Christoph Lameter
2004-10-15 19:05 ` Christoph Lameter
2004-10-15 19:06 ` page fault scalability patch V10: [4/7] cmpxchg for 386 and 486 Christoph Lameter
2004-10-15 19:06 ` Christoph Lameter
2004-10-15 19:06 ` page fault scalability patch V10: [5/7] i386 atomic pte operations Christoph Lameter
2004-10-15 19:06 ` Christoph Lameter
2004-10-15 19:07 ` page fault scalability patch V10: [6/7] x86_64 " Christoph Lameter
2004-10-15 19:07 ` Christoph Lameter
2004-10-15 19:08 ` page fault scalability patch V10: [7/7] s/390 " Christoph Lameter
2004-10-15 19:08 ` Christoph Lameter
[not found] ` <B6E8046E1E28D34EB815A11AC8CA312902CD3282@mtv-atc-605e--n.corp.sgi.com>
2004-09-27 19:07 ` page fault scalability patch V9: [1/7] make mm->rss atomic Christoph Lameter
2004-09-27 19:08 ` page fault scalability patch V9: [2/7] defer/remove page_table_lock Christoph Lameter
2004-09-27 19:10 ` page fault scalability patch V9: [3/7] atomic pte operatios for ia64 Christoph Lameter
2004-09-27 19:10 ` page fault scalability patch V9: [4/7] generally available cmpxchg on i386 Christoph Lameter
2004-09-27 19:11 ` page fault scalability patch V9: [5/7] atomic pte operations for i386 Christoph Lameter
2004-09-27 19:12 ` page fault scalability patch V9: [6/7] atomic pte operations for x86_64 Christoph Lameter
2004-09-27 19:13 ` page fault scalability patch V9: [7/7] atomic pte operatiosn for s390 Christoph Lameter
2004-09-18 23:29 ` page fault scalability patch V8: [5/7] atomic pte operations for Christoph Lameter
2004-09-18 23:29 ` page fault scalability patch V8: [5/7] atomic pte operations for i386 Christoph Lameter
2004-09-18 23:30 ` page fault scalability patch V8: [6/7] atomic pte operations for Christoph Lameter
2004-09-18 23:30 ` page fault scalability patch V8: [6/7] atomic pte operations for x86_64 Christoph Lameter
2004-09-18 23:31 ` page fault scalability patch V8: [7/7] atomic pte operations for Christoph Lameter
2004-09-18 23:31 ` page fault scalability patch V8: [7/7] atomic pte operations for s390 Christoph Lameter
[not found] ` <200409191435.09445.vda@port.imtp.ilyichevsk.odessa.ua>
2004-09-20 15:44 ` page fault scalability patch V8: [7/7] atomic pte operations Christoph Lameter
2004-09-20 15:44 ` page fault scalability patch V8: [7/7] atomic pte operations for s390 Christoph Lameter
2004-08-15 22:38 ` page fault fastpath: Increasing SMP scalability by introducing Benjamin Herrenschmidt
2004-08-15 22:38 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Benjamin Herrenschmidt
2004-08-16 17:28 ` page fault fastpath: Increasing SMP scalability by introducing Christoph Lameter
2004-08-16 17:28 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Christoph Lameter
2004-08-17 8:01 ` page fault fastpath: Increasing SMP scalability by introducing Benjamin Herrenschmidt
2004-08-17 8:01 ` page fault fastpath: Increasing SMP scalability by introducing pte locks? Benjamin Herrenschmidt
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