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

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Hi Seth,

On Tue, Jun 4, 2013 at 4:33 AM, Seth Jennings
<sjenning@xxxxxxxxxxxxxxxxxx> 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.

I found zswap will cause performance drop when using mmtests-0.10 to test it.
The config file I'm using is: config-global-dhp__parallelio-memcachetest

The result is:
(v3.10-rc4-2G-nozswap was without zswap but the performance is better.)

                                         v3.10-rc4                   v3.10-rc4
                                     2G-zswap-base                  2G-nozswap
Ops memcachetest-0M               604.00 (  0.00%)           1077.00 ( 78.31%)
Ops memcachetest-198M             630.00 (  0.00%)           1007.00 ( 59.84%)
Ops memcachetest-430M             609.00 (  0.00%)            939.00 ( 54.19%)
Ops memcachetest-661M             604.00 (  0.00%)            845.00 ( 39.90%)
Ops memcachetest-893M             591.00 (  0.00%)            839.00 ( 41.96%)
Ops memcachetest-1125M            599.00 (  0.00%)            781.00 ( 30.38%)
Ops memcachetest-1356M            588.00 (  0.00%)            771.00 ( 31.12%)
Ops io-duration-0M                  0.00 (  0.00%)              1.00 (-99.00%)
Ops io-duration-198M              177.00 (  0.00%)             21.00 ( 88.14%)
Ops io-duration-430M              168.00 (  0.00%)             25.00 ( 85.12%)
Ops io-duration-661M              214.00 (  0.00%)             30.00 ( 85.98%)
Ops io-duration-893M              186.00 (  0.00%)             32.00 ( 82.80%)
Ops io-duration-1125M             175.00 (  0.00%)             42.00 ( 76.00%)
Ops io-duration-1356M             245.00 (  0.00%)             51.00 ( 79.18%)
Ops swaptotal-0M               487760.00 (  0.00%)         459754.00 (  5.74%)
Ops swaptotal-198M             563581.00 (  0.00%)         485194.00 ( 13.91%)
Ops swaptotal-430M             579472.00 (  0.00%)         500817.00 ( 13.57%)
Ops swaptotal-661M             568086.00 (  0.00%)         524209.00 (  7.72%)
Ops swaptotal-893M             584405.00 (  0.00%)         509846.00 ( 12.76%)
Ops swaptotal-1125M            572992.00 (  0.00%)         534115.00 (  6.78%)
Ops swaptotal-1356M            573259.00 (  0.00%)         529814.00 (  7.58%)
Ops swapin-0M                  231250.00 (  0.00%)         236069.00 ( -2.08%)
Ops swapin-198M                312259.00 (  0.00%)         239149.00 ( 23.41%)
Ops swapin-430M                327178.00 (  0.00%)         246803.00 ( 24.57%)
Ops swapin-661M                319575.00 (  0.00%)         273644.00 ( 14.37%)
Ops swapin-893M                328195.00 (  0.00%)         257327.00 ( 21.59%)
Ops swapin-1125M               317345.00 (  0.00%)         271109.00 ( 14.57%)
Ops swapin-1356M               312858.00 (  0.00%)         266050.00 ( 14.96%)
Ops minorfaults-0M             592150.00 (  0.00%)         646076.00 ( -9.11%)
Ops minorfaults-198M           637339.00 (  0.00%)         676441.00 ( -6.14%)
Ops minorfaults-430M           626228.00 (  0.00%)         684715.00 ( -9.34%)
Ops minorfaults-661M           625089.00 (  0.00%)         670639.00 ( -7.29%)
Ops minorfaults-893M           612877.00 (  0.00%)         669723.00 ( -9.28%)
Ops minorfaults-1125M          624800.00 (  0.00%)         667025.00 ( -6.76%)
Ops minorfaults-1356M          618800.00 (  0.00%)         657600.00 ( -6.27%)
Ops majorfaults-0M              67664.00 (  0.00%)          40060.00 ( 40.80%)
Ops majorfaults-198M            72377.00 (  0.00%)          39517.00 ( 45.40%)
Ops majorfaults-430M            71822.00 (  0.00%)          38895.00 ( 45.85%)
Ops majorfaults-661M            70009.00 (  0.00%)          39625.00 ( 43.40%)
Ops majorfaults-893M            74988.00 (  0.00%)          38073.00 ( 49.23%)
Ops majorfaults-1125M           72458.00 (  0.00%)          38206.00 ( 47.27%)
Ops majorfaults-1356M           70549.00 (  0.00%)          37430.00 ( 46.94%)

Regards,
-Bob

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