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SubjectRe: [PATCHv4 0/7] zswap: compressed swap caching
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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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