From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Simon Jeons <simon.jeons@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nitin Gupta <ngupta@vflare.org>, Minchan Kim <minchan@kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
Robert Jennings <rcj@linux.vnet.ibm.com>,
Jenifer Hopper <jhopper@us.ibm.com>, Mel Gorman <mgorman@suse.de>,
Johannes Weiner <jweiner@redhat.com>,
Rik van Riel <riel@redhat.com>,
Larry Woodman <lwoodman@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
devel@driverdev.osuosl.org
Subject: Re: [PATCHv4 0/7] zswap: compressed swap caching
Date: Mon, 04 Feb 2013 08:56:18 -0600 [thread overview]
Message-ID: <510FCC12.1060604@linux.vnet.ibm.com> (raw)
In-Reply-To: <1359850629.3064.1.camel@kernel.cn.ibm.com>
On 02/02/2013 06:17 PM, Simon Jeons wrote:
> On Fri, 2013-02-01 at 09:13 -0600, Seth Jennings wrote:
>> On 01/31/2013 07:39 PM, Simon Jeons wrote:
>>> Hi Seth,
>>> On Tue, 2013-01-29 at 15:40 -0600, Seth Jennings wrote:
>> <snip>
>>>> Performance, Kernel Building:
>>>>
>>>> Setup
>>>> ========
>>>> Gentoo w/ kernel v3.7-rc7
>>>> Quad-core i5-2500 @ 3.3GHz
>>>> 512MB DDR3 1600MHz (limited with mem=512m on boot)
>>>> Filesystem and swap on 80GB HDD (about 58MB/s with hdparm -t)
>>>> majflt are major page faults reported by the time command
>>>> pswpin/out is the delta of pswpin/out from /proc/vmstat before and after
>>>> then make -jN
>>>>
>>>> Summary
>>>> ========
>>>> * Zswap reduces I/O and improves performance at all swap pressure levels.
>>>>
>>>> * Under heavy swaping at 24 threads, zswap reduced I/O by 76%, saving
>>>> over 1.5GB of I/O, and cut runtime in half.
>>>
>>> How to get your benchmark?
>>
>> It's just kernel building. So "make" :)
>>
>> I intentionally choose this workload so people wouldn't have to jump
>> through hoops to replicate the results.
>
> Thanks for your clarify. zswap is belong to in-kernel compression,
> correct? then what's the difference between in-memory compression and
> in-kernel compression?
Dan made this distinction (possibly unintentionally) in his email.
For me "in-kernel" means "done by the kernel" and "in-memory" means
"stored in RAM". So it is compression of RAM pages done by the kernel
and stored back in RAM.
I sum up the functionality of zswap as "compressed swap caching",
which I think better conveys what zswap does exactly.
Seth
next prev parent reply other threads:[~2013-02-04 14:57 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-29 21:40 [PATCHv4 0/7] zswap: compressed swap caching Seth Jennings
2013-01-29 21:40 ` [PATCHv4 1/7] debugfs: add get/set for atomic types Seth Jennings
2013-01-29 21:40 ` [PATCHv4 2/7] zsmalloc: promote to lib/ Seth Jennings
2013-01-29 22:51 ` Andrew Morton
2013-01-30 16:28 ` Seth Jennings
2013-01-30 23:34 ` Andrew Morton
2013-01-31 5:35 ` Minchan Kim
2013-02-13 16:00 ` Seth Jennings
2013-01-29 21:40 ` [PATCHv4 3/7] zswap: add to mm/ Seth Jennings
2013-01-31 7:07 ` Minchan Kim
2013-01-31 19:06 ` Seth Jennings
2013-01-31 20:07 ` Robert Jennings
2013-02-01 2:38 ` Minchan Kim
2013-02-01 15:31 ` Seth Jennings
2013-02-01 17:46 ` Seth Jennings
2013-01-29 21:40 ` [PATCHv4 4/7] mm: break up swap_writepage() for frontswap backends Seth Jennings
2013-01-29 21:40 ` [PATCHv4 5/7] mm: allow for outstanding swap writeback accounting Seth Jennings
2013-01-29 21:40 ` [PATCHv4 6/7] zswap: add flushing support Seth Jennings
2013-01-29 23:03 ` Andrew Morton
2013-02-01 7:27 ` Minchan Kim
2013-02-13 6:24 ` Seth Jennings
2013-01-29 21:40 ` [PATCHv4 7/7] zswap: add documentation Seth Jennings
2013-01-29 23:07 ` Andrew Morton
2013-01-29 22:14 ` [PATCHv4 0/7] zswap: compressed swap caching Joe Perches
2013-01-29 22:49 ` Seth Jennings
2013-01-30 4:32 ` Minchan Kim
2013-01-30 16:01 ` Seth Jennings
2013-02-01 1:39 ` Simon Jeons
2013-02-01 15:13 ` Seth Jennings
2013-02-03 0:17 ` Simon Jeons
2013-02-04 14:56 ` Seth Jennings [this message]
2013-02-04 1:03 ` Simon Jeons
2013-02-04 15:07 ` Seth Jennings
[not found] ` <5110287A.5050200@linux.vnet.ibm.com>
2013-02-04 21:45 ` Seth Jennings
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