On 05.04.2019 14:40, Denis Plotnikov wrote: > ping! > > On 26.03.2019 18:51, Denis Plotnikov wrote: >> 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
