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
