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From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Magenheimer <dan.magenheimer@oracle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Nitin Gupta <ngupta@vflare.org>,
	Robert Jennings <rcj@linux.vnet.ibm.com>,
	linux-mm@kvack.org, devel@driverdev.osuosl.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] zsmalloc improvements
Date: Wed, 11 Jul 2012 14:16:59 -0500	[thread overview]
Message-ID: <4FFDD12B.1050909@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FFD2524.2050300@kernel.org>

On 07/11/2012 02:03 AM, Minchan Kim wrote:
> Today, I tested zsmapbench in my embedded board(ARM).
> tlb-flush is 30% faster than copy-based so it's always not win.
> I think it depends on CPU speed/cache size.

After you pointed this out, I decided to test this on my
Raspberry Pi, the only ARM system I have that is open enough
for me to work with.

I pulled some of the cycle counting stuff out of
arch/arm/kernel/perf_event_v6.c.  I've pushed that code to
the github repo.

git://github.com/spartacus06/zsmapbench.git

My results were in agreement with your findings.  I got 2040
cycles/map for the copy method and 947 cycles/map for the
page-table method.  I think memory speed is playing a big
roll in the difference.

I agree that the page-table method should be restored since
the performance difference is so significant on ARM, a
platform that benefits a lot from memory compression IMHO.

Still, the question remains how to implement the selection
logic, since not all archs that support the page-table
method will necessarily perform better with it.

Thanks,
Seth


WARNING: multiple messages have this Message-ID
From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Magenheimer <dan.magenheimer@oracle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Nitin Gupta <ngupta@vflare.org>,
	Robert Jennings <rcj@linux.vnet.ibm.com>,
	linux-mm@kvack.org, devel@driverdev.osuosl.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] zsmalloc improvements
Date: Wed, 11 Jul 2012 14:16:59 -0500	[thread overview]
Message-ID: <4FFDD12B.1050909@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FFD2524.2050300@kernel.org>

On 07/11/2012 02:03 AM, Minchan Kim wrote:
> Today, I tested zsmapbench in my embedded board(ARM).
> tlb-flush is 30% faster than copy-based so it's always not win.
> I think it depends on CPU speed/cache size.

After you pointed this out, I decided to test this on my
Raspberry Pi, the only ARM system I have that is open enough
for me to work with.

I pulled some of the cycle counting stuff out of
arch/arm/kernel/perf_event_v6.c.  I've pushed that code to
the github repo.

git://github.com/spartacus06/zsmapbench.git

My results were in agreement with your findings.  I got 2040
cycles/map for the copy method and 947 cycles/map for the
page-table method.  I think memory speed is playing a big
roll in the difference.

I agree that the page-table method should be restored since
the performance difference is so significant on ARM, a
platform that benefits a lot from memory compression IMHO.

Still, the question remains how to implement the selection
logic, since not all archs that support the page-table
method will necessarily perform better with it.

Thanks,
Seth

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  parent reply	other threads:[~2012-07-11 19:18 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-02 21:15 Seth Jennings
2012-07-02 21:15 ` Seth Jennings
2012-07-02 21:15 ` [PATCH 1/4] zsmalloc: remove x86 dependency Seth Jennings
2012-07-02 21:15   ` Seth Jennings
2012-07-10  2:21   ` Minchan Kim
2012-07-10  2:21     ` Minchan Kim
2012-07-10 15:29     ` Seth Jennings
2012-07-10 15:29       ` Seth Jennings
2012-07-11  7:27       ` Minchan Kim
2012-07-11  7:27         ` Minchan Kim
2012-07-11 18:26   ` Nitin Gupta
2012-07-11 18:26     ` Nitin Gupta
2012-07-11 20:32     ` Seth Jennings
2012-07-11 20:32       ` Seth Jennings
2012-07-11 22:42       ` Nitin Gupta
2012-07-11 22:42         ` Nitin Gupta
2012-07-12  0:23         ` Seth Jennings
2012-07-12  0:23           ` Seth Jennings
2012-07-02 21:15 ` [PATCH 2/4] zsmalloc: add single-page object fastpath in unmap Seth Jennings
2012-07-02 21:15   ` Seth Jennings
2012-07-10  2:25   ` Minchan Kim
2012-07-10  2:25     ` Minchan Kim
2012-07-02 21:15 ` [PATCH 3/4] zsmalloc: add details to zs_map_object boiler plate Seth Jennings
2012-07-02 21:15   ` Seth Jennings
2012-07-10  2:35   ` Minchan Kim
2012-07-10  2:35     ` Minchan Kim
2012-07-10 15:17     ` Seth Jennings
2012-07-10 15:17       ` Seth Jennings
2012-07-11  7:42       ` Minchan Kim
2012-07-11  7:42         ` Minchan Kim
2012-07-11 14:15         ` Seth Jennings
2012-07-11 14:15           ` Seth Jennings
2012-07-12  1:15           ` Minchan Kim
2012-07-12  1:15             ` Minchan Kim
2012-07-12 19:54             ` Dan Magenheimer
2012-07-12 19:54               ` Dan Magenheimer
2012-07-12 22:46               ` Dan Magenheimer
2012-07-12 22:46                 ` Dan Magenheimer
2012-07-02 21:15 ` [PATCH 4/4] zsmalloc: add mapping modes Seth Jennings
2012-07-02 21:15   ` Seth Jennings
2012-07-04  5:33 ` [PATCH 0/4] zsmalloc improvements Minchan Kim
2012-07-04  5:33   ` Minchan Kim
2012-07-04 20:43 ` Konrad Rzeszutek Wilk
2012-07-04 20:43   ` Konrad Rzeszutek Wilk
2012-07-06 15:07   ` Seth Jennings
2012-07-06 15:07     ` Seth Jennings
2012-07-09 13:58     ` Seth Jennings
2012-07-09 13:58       ` Seth Jennings
2012-07-11 19:42       ` Konrad Rzeszutek Wilk
2012-07-11 19:42         ` Konrad Rzeszutek Wilk
2012-07-11 20:48         ` Seth Jennings
2012-07-11 20:48           ` Seth Jennings
2012-07-12 10:40           ` Konrad Rzeszutek Wilk
2012-07-12 10:40             ` Konrad Rzeszutek Wilk
2012-07-11  7:03 ` Minchan Kim
2012-07-11  7:03   ` Minchan Kim
2012-07-11 14:00   ` Seth Jennings
2012-07-11 14:00     ` Seth Jennings
2012-07-12  1:01     ` Minchan Kim
2012-07-12  1:01       ` Minchan Kim
2012-07-11 19:16   ` Seth Jennings [this message]
2012-07-11 19:16     ` Seth Jennings

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