From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>,
Martin Bligh <mbligh@google.com>,
Dave Hansen <hansendc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed)
Date: Sun, 8 Apr 2007 00:18:44 +0200 [thread overview]
Message-ID: <200704080018.45084.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0704071455060.31468@schroedinger.engr.sgi.com>
On Sunday 08 April 2007 00:06:13 Christoph Lameter wrote:
> Results:
>
> x86_64 boot with virtual memmap
>
> Format: #events totaltime (min/avg/max)
>
> kfree_virt_to_page 598430 5.6ms(3ns/9ns/322ns)
>
> x86_64 boot regular sparsemem
>
> kfree_virt_to_page 596360 10.5ms(4ns/18ns/28.7us)
>
>
> On average sparsemem virtual takes half the time than of sparsemem.
Nice. But on what workloads?
Anyways it looks promising. I hope we can just
replace old style sparsemem support with this for x86-64.
> Time is measured using the cycle counter (TSC on IA32, ITC on IA64) which has
> a very low latency.
Sorry that triggered my usual RDTSC rant...
Not on NetBurst (hundred of cycles) And on the others (C2,K8) it is a bit dangerous
to measure short code blocks because RDTSC is not guaranteed ordered with the surrounding
instructions.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andy Whitcroft <apw@shadowen.org>,
Martin Bligh <mbligh@google.com>,
Dave Hansen <hansendc@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed)
Date: Sun, 8 Apr 2007 00:18:44 +0200 [thread overview]
Message-ID: <200704080018.45084.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0704071455060.31468@schroedinger.engr.sgi.com>
On Sunday 08 April 2007 00:06:13 Christoph Lameter wrote:
> Results:
>
> x86_64 boot with virtual memmap
>
> Format: #events totaltime (min/avg/max)
>
> kfree_virt_to_page 598430 5.6ms(3ns/9ns/322ns)
>
> x86_64 boot regular sparsemem
>
> kfree_virt_to_page 596360 10.5ms(4ns/18ns/28.7us)
>
>
> On average sparsemem virtual takes half the time than of sparsemem.
Nice. But on what workloads?
Anyways it looks promising. I hope we can just
replace old style sparsemem support with this for x86-64.
> Time is measured using the cycle counter (TSC on IA32, ITC on IA64) which has
> a very low latency.
Sorry that triggered my usual RDTSC rant...
Not on NetBurst (hundred of cycles) And on the others (C2,K8) it is a bit dangerous
to measure short code blocks because RDTSC is not guaranteed ordered with the surrounding
instructions.
-Andi
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next prev parent reply other threads:[~2007-04-07 22:19 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-01 7:10 [PATCH 1/2] Generic Virtual Memmap suport for SPARSEMEM Christoph Lameter
2007-04-01 7:10 ` Christoph Lameter
2007-04-01 7:10 ` [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL Christoph Lameter
2007-04-01 7:10 ` Christoph Lameter
2007-04-01 7:11 ` Christoph Lameter
2007-04-01 7:11 ` Christoph Lameter
2007-04-01 10:46 ` Andi Kleen
2007-04-01 10:46 ` Andi Kleen
2007-04-02 15:37 ` Christoph Lameter
2007-04-02 15:37 ` Christoph Lameter
2007-04-02 15:44 ` Andi Kleen
2007-04-02 15:44 ` Andi Kleen
2007-04-02 15:51 ` Martin J. Bligh
2007-04-02 15:51 ` Martin J. Bligh
2007-04-02 15:54 ` Christoph Lameter
2007-04-02 15:54 ` Christoph Lameter
2007-04-02 17:14 ` Andi Kleen
2007-04-02 17:14 ` Andi Kleen
2007-04-02 17:34 ` Christoph Lameter
2007-04-02 17:34 ` Christoph Lameter
2007-04-02 19:54 ` Dave Hansen
2007-04-02 19:54 ` Dave Hansen
2007-04-02 20:11 ` Christoph Lameter
2007-04-02 20:11 ` Christoph Lameter
2007-04-02 20:13 ` Dave Hansen
2007-04-02 20:13 ` Dave Hansen
2007-04-02 20:30 ` Christoph Lameter
2007-04-02 20:30 ` Christoph Lameter
2007-04-02 20:38 ` Martin Bligh
2007-04-02 20:38 ` Martin Bligh
2007-04-02 20:51 ` Christoph Lameter
2007-04-02 20:51 ` Christoph Lameter
2007-04-05 11:50 ` Andy Whitcroft
2007-04-05 11:50 ` Andy Whitcroft
2007-04-05 18:27 ` Christoph Lameter
2007-04-05 18:27 ` Christoph Lameter
2007-04-07 22:06 ` [PATCH 1/4] x86_64: (SPARSE_VIRTUAL doubles sparsemem speed) Christoph Lameter
2007-04-07 22:06 ` Christoph Lameter
2007-04-07 22:18 ` Andi Kleen [this message]
2007-04-07 22:18 ` Andi Kleen
2007-04-09 16:40 ` William Lee Irwin III
2007-04-09 16:40 ` William Lee Irwin III
2007-04-09 17:16 ` Christoph Lameter
2007-04-09 17:16 ` Christoph Lameter
2007-04-09 18:20 ` William Lee Irwin III
2007-04-09 18:20 ` William Lee Irwin III
2007-04-02 21:08 ` [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL Dave Hansen
2007-04-02 21:08 ` Dave Hansen
2007-04-02 21:28 ` Christoph Lameter
2007-04-02 21:28 ` Christoph Lameter
2007-04-02 21:43 ` Martin Bligh
2007-04-02 21:43 ` Martin Bligh
2007-04-02 21:56 ` Dave Hansen
2007-04-02 21:56 ` Dave Hansen
2007-04-02 22:29 ` Christoph Lameter
2007-04-02 22:29 ` Christoph Lameter
2007-04-02 22:31 ` Andi Kleen
2007-04-02 22:31 ` Andi Kleen
2007-04-02 22:37 ` Christoph Lameter
2007-04-02 22:37 ` Christoph Lameter
2007-04-02 22:41 ` Martin Bligh
2007-04-02 22:41 ` Martin Bligh
2007-04-02 22:49 ` Christoph Lameter
2007-04-02 22:49 ` Christoph Lameter
2007-04-02 22:52 ` Martin Bligh
2007-04-02 22:52 ` Martin Bligh
2007-04-05 12:07 ` Andy Whitcroft
2007-04-05 12:07 ` Andy Whitcroft
2007-04-04 21:27 ` Bob Picco
2007-04-04 21:27 ` Bob Picco
2007-04-04 22:38 ` Christoph Lameter
2007-04-04 22:38 ` Christoph Lameter
2007-04-02 23:03 ` Bjorn Helgaas
2007-04-02 23:03 ` Bjorn Helgaas
2007-04-02 15:44 ` Christoph Lameter
2007-04-02 15:44 ` Christoph Lameter
2007-04-02 16:18 ` Christoph Lameter
2007-04-02 16:18 ` Christoph Lameter
2007-04-02 20:50 ` [PATCH 1/2] Generic Virtual Memmap suport for SPARSEMEM Dave Hansen
2007-04-02 20:50 ` Dave Hansen
2007-04-02 21:00 ` Christoph Lameter
2007-04-02 21:00 ` Christoph Lameter
2007-04-02 21:22 ` Dave Hansen
2007-04-02 21:22 ` Dave Hansen
2007-04-02 21:31 ` Christoph Lameter
2007-04-02 21:31 ` Christoph Lameter
2007-04-02 21:42 ` Dave Hansen
2007-04-02 21:42 ` Dave Hansen
2007-04-02 21:53 ` Christoph Lameter
2007-04-02 21:53 ` Christoph Lameter
2007-04-02 22:05 ` Dave Hansen
2007-04-02 22:05 ` Dave Hansen
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