linux-kernel - Re: [PATCHv13 3/4] zswap: add to mm/

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Message-ID: <CAA_GA1dm=tsFotB3mFemKEpk5arONfD6+LMkC-G6tBhBR5wAsg@mail.gmail.com>
Date:	Wed, 19 Jun 2013 22:17:14 +0800
From:	Bob Liu <lliubbo@...il.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Minchan Kim <minchan@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	Jenifer Hopper <jhopper@...ibm.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Dave Hansen <dave@...1.net>, Joe Perches <joe@...ches.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Hugh Dickens <hughd@...gle.com>,
	Paul Mackerras <paulus@...ba.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv13 3/4] zswap: add to mm/

On Wed, Jun 19, 2013 at 10:09 PM, Seth Jennings
<sjenning@...ux.vnet.ibm.com> wrote:
> On Mon, Jun 17, 2013 at 02:20:05PM +0800, Bob Liu wrote:
>> Hi Seth,
>>
>> On Tue, Jun 4, 2013 at 4:33 AM, Seth Jennings
>> <sjenning@...ux.vnet.ibm.com> wrote:
>> > zswap is a thin backend for frontswap that takes pages that are in the process
>> > of being swapped out and attempts to compress them and store them in a
>> > RAM-based memory pool.  This can result in a significant I/O reduction on the
>> > swap device and, in the case where decompressing from RAM is faster than
>> > reading from the swap device, can also improve workload performance.
>> >
>> > It also has support for evicting swap pages that are currently compressed in
>> > zswap to the swap device on an LRU(ish) basis. This functionality makes zswap a
>> > true cache in that, once the cache is full, the oldest pages can be moved out
>> > of zswap to the swap device so newer pages can be compressed and stored in
>> > zswap.
>> >
>> > This patch adds the zswap driver to mm/
>> >
>>
>> Do you have any more benchmark can share with me ? To figure out that
>> we can benefit from zswap.
>
> The two I've done or kernbench and SPECjbb.  I'm trying out the memtests

Thanks, I'll try to setup them.

> now.  I'd like to be able to explain the numbers you are seeing at least.
>
> Sorry for the delay.  I'll get back to you once I've figured out how
> to using mmtests and get some results/explanations.
>
> Also, how much physical RAM did this box have? I see 2G in the profile name
> but not sure if that is the workload size or the RAM size.  I seems that the

2G RAM size.

> test is overcommitted from the beginning as indicated by the swap activity.
> I know that the parallelio-memcachetest default profile only uses 80% of
> physical memory, so you have apparently made a change yes?
>

No, I just "cp configs/config-global-dhp__parallelio-memcachetest
config" and then run mmtests.sh with monitor.
I'm using mmtests version 0.10.

--
Regards,
--Bob
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