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
