Re: [Qemu-devel] [PATCH 0/3] migration: add sztd compression

[Denis Plotnikov]

ping ping ping ping ping!

On 18.03.2019 10:53, Denis Plotnikov wrote:
> ping ping ping ping!
> 
> On 11.03.2019 11:20, Denis Plotnikov wrote:
>> ping ping ping!
>>
>> On 04.03.2019 18:10, Denis Plotnikov wrote:
>>> ping!
>>>
>>> On 26.02.2019 16:15, Denis Plotnikov wrote:
>>>> zstd date compression algorithm shows better performance on data 
>>>> compression.
>>>> It might be useful to employ the algorithm in VM migration to reduce CPU 
>>>> usage.
>>>> A user will be able to choose between those algorithms, therefor 
>>>> compress-type
>>>> migration parameter is added.
>>>>
>>>> Here are some results of performance comparison zstd vs gzip:
>>>>
>>>> host: i7-4790 8xCPU @ 3.60GHz, 16G RAM
>>>> migration to the same host
>>>> VM: 2xVCPU, 8G RAM total
>>>> 5G RAM used, memory populated with postgreqsl data
>>>> produced by pgbench performance benchmark
>>>>
>>>>
>>>> Threads: 1 compress – 1 decompress
>>>>
>>>> zstd provides slightly less compression ratio with almost the same
>>>> CPU usage but copes with RAM  compression roghly 2 times faster
>>>>
>>>> compression type              zlib       |      zstd
>>>> ---------------------------------------------------------
>>>> compression level          1       5     |   1       5
>>>> compression ratio          6.92    7.05  |   6.69    6.89
>>>> cpu idle, %                82      83    |   86      80
>>>> time, sec                  49      71    |   26      31
>>>> time diff to zlib, sec                      -25     -41
>>>>
>>>>
>>>> Threads: 8 compress – 2 decompress
>>>>
>>>> zstd provides the same migration time with less cpu consumption
>>>>
>>>> compression type         none  |        gzip(zlib)    |          zstd
>>>> ------------------------------------------------------------------------------
>>>> compression level        -     |  1      5       9    |   1       5       
>>>> 15
>>>> compression ratio        -     |  6.94   6.99    7.14 |   6.64    6.89    
>>>> 6.93
>>>> time, sec                154   |  22     23      27   |   23      23      
>>>> 25
>>>> cpu idle, %              99    |  45     30      12   |   70      52      
>>>> 23
>>>> cpu idle diff to zlib          |                      |  -25%    -22%    
>>>> -11%
>>>>
>>>>
>>>> Denis Plotnikov (3):
>>>>       migration: rework compression code for adding more data compressors
>>>>       hmp: add compress-type parameter to migration parameters
>>>>       migration: add zstd compression
>>>>
>>>>      configure             |  26 ++++
>>>>      hmp.c                 |   8 ++
>>>>      migration/migration.c |  45 ++++++-
>>>>      migration/migration.h |   1 +
>>>>      migration/qemu-file.c |  39 ++----
>>>>      migration/qemu-file.h |  18 ++-
>>>>      migration/ram.c       | 291 ++++++++++++++++++++++++++++++++++--------
>>>>      qapi/migration.json   |  26 +++-
>>>>      8 files changed, 369 insertions(+), 85 deletions(-)
>>>>
>>>
>>
> 

-- 
Best,
Denis