linux-kernel - Re: [PATCHv4 0/7] zswap: compressed swap caching

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Message-ID: <1359939818.9366.1.camel@kernel.cn.ibm.com>
Date:	Sun, 03 Feb 2013 19:03:38 -0600
From:	Simon Jeons <simon.jeons@...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@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCHv4 0/7] zswap: compressed swap caching

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.

Since there already have zram which can handle anonymous pages
compression, why need zswap? What's the difference of design between
zram and zswap? 

> 
> Seth
> 


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