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From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Konrad Rzeszutek Wilk <konrad@darnok.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>, Minchan Kim <minchan@kernel.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: Mon, 09 Jul 2012 08:58:23 -0500	[thread overview]
Message-ID: <4FFAE37F.70403@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FF6FF1F.5090701@linux.vnet.ibm.com>

On 07/06/2012 10:07 AM, Seth Jennings wrote:
> On 07/04/2012 03:43 PM, Konrad Rzeszutek Wilk wrote:
>> On Mon, Jul 02, 2012 at 04:15:48PM -0500, Seth Jennings wrote:
>>> This exposed an interesting and unexpected result: in all
>>> cases that I tried, copying the objects that span pages instead
>>> of using the page table to map them, was _always_ faster.  I could
>>> not find a case in which the page table mapping method was faster.
>>
>> Which architecture was this under? It sounds x86-ish? Is this on
>> Westmere and more modern machines? What about Core2 architecture?
>>
>> Oh how did it work on AMD Phenom boxes?
> 
> I don't have a Phenom box but I have an Athlon X2 I can try out.
> I'll get this information next Monday.

Actually, I'm running some production stuff on that box, so
I rather not put testing stuff on it.  Is there any
particular reason that you wanted this information? Do you
have a reason to believe that mapping will be faster than
copy for AMD procs?

(To everyone) I'd like to get this acked before the 3.6
merge window if there are no concerns/objections.

Thanks,
Seth


WARNING: multiple messages have this Message-ID (diff)
From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Konrad Rzeszutek Wilk <konrad@darnok.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>, Minchan Kim <minchan@kernel.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: Mon, 09 Jul 2012 08:58:23 -0500	[thread overview]
Message-ID: <4FFAE37F.70403@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FF6FF1F.5090701@linux.vnet.ibm.com>

On 07/06/2012 10:07 AM, Seth Jennings wrote:
> On 07/04/2012 03:43 PM, Konrad Rzeszutek Wilk wrote:
>> On Mon, Jul 02, 2012 at 04:15:48PM -0500, Seth Jennings wrote:
>>> This exposed an interesting and unexpected result: in all
>>> cases that I tried, copying the objects that span pages instead
>>> of using the page table to map them, was _always_ faster.  I could
>>> not find a case in which the page table mapping method was faster.
>>
>> Which architecture was this under? It sounds x86-ish? Is this on
>> Westmere and more modern machines? What about Core2 architecture?
>>
>> Oh how did it work on AMD Phenom boxes?
> 
> I don't have a Phenom box but I have an Athlon X2 I can try out.
> I'll get this information next Monday.

Actually, I'm running some production stuff on that box, so
I rather not put testing stuff on it.  Is there any
particular reason that you wanted this information? Do you
have a reason to believe that mapping will be faster than
copy for AMD procs?

(To everyone) I'd like to get this acked before the 3.6
merge window if there are no concerns/objections.

Thanks,
Seth

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  reply	other threads:[~2012-07-09 13:58 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-02 21:15 [PATCH 0/4] zsmalloc improvements 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 [this message]
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
2012-07-11 19:16     ` Seth Jennings

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