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Date: Fri, 01 Feb 2013 09:13:19 -0600
From: Seth Jennings <sjenning@linux.vnet.ibm.com>
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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
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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.

Seth