Re: zram: per-cpu compression streams

From	Minchan Kim <minchan@kernel.org>
Newsgroups	linux.kernel
Subject	Re: zram: per-cpu compression streams
Date	2016-04-27 10:00 +0200
Message-ID	<rssy6-5VB-1@gated-at.bofh.it> (permalink)
References	(5 earlier) <rpcga-1JC-23@gated-at.bofh.it> <rpyJI-3gW-7@gated-at.bofh.it> <rs9lM-6K3-7@gated-at.bofh.it> <rss54-5GG-17@gated-at.bofh.it> <rssoq-5QU-13@gated-at.bofh.it>
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On Wed, Apr 27, 2016 at 04:43:35PM +0900, Sergey Senozhatsky wrote:
> Hello,
> 
> On (04/27/16 16:29), Minchan Kim wrote:
> [..]
> > > the test:
> > > 
> > > -- 4 GB x86_64 box
> > > -- zram 3GB, lzo
> > > -- mem-hogger pre-faults 3GB of pages before the fio test
> > > -- fio test has been modified to have 11% compression ratio (to increase the
> > >                                                   chances of re-compressions)
> > 
> > Could you test concurrent mem hogger with fio rather than pre-fault before fio test
> > in next submit?
> 
> this test will not prove anything, unfortunately. I performed it;
> and it's impossible to guarantee even remotely stable results.
> mem-hogger process can spend on pre-fault from 41 to 81 seconds;
> so I'm quite sceptical about the actual value of this test.
> 
> > > considering buffer_compress_percentage=11, the box was under somewhat
> > > heavy pressure.
> > > 
> > > now, the results
> > 
> > Yeb, Even, recompression case is fater than old but want to see more heavy memory
> > pressure case and the ratio I mentioned above.
> 
> I did quite heavy testing over the last 7 days, with numerous OOM kills
> and OOM panics.

Okay, I think it's worth to merge enough and see the result.
Please send formal patch which has recompression stat. ;-)

Thanks.

Thread

Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-18 10:00 +0200
  Re: zram: per-cpu compression streams Minchan Kim <minchan@kernel.org> - 2016-04-19 10:00 +0200
    Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-19 10:10 +0200
    Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-26 13:30 +0200
      Re: zram: per-cpu compression streams Minchan Kim <minchan@kernel.org> - 2016-04-27 09:30 +0200
        Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-27 09:50 +0200
          Re: zram: per-cpu compression streams Minchan Kim <minchan@kernel.org> - 2016-04-27 10:00 +0200
            Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-27 10:10 +0200
        Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-27 11:00 +0200
          Re: zram: per-cpu compression streams Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-04-27 11:10 +0200

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