qemu/qapi
Denis Plotnikov d298ac10ad qcow2: add zstd cluster compression
zstd significantly reduces cluster compression time.
It provides better compression performance maintaining
the same level of the compression ratio in comparison with
zlib, which, at the moment, is the only compression
method available.

The performance test results:
Test compresses and decompresses qemu qcow2 image with just
installed rhel-7.6 guest.
Image cluster size: 64K. Image on disk size: 2.2G

The test was conducted with brd disk to reduce the influence
of disk subsystem to the test results.
The results is given in seconds.

compress cmd:
  time ./qemu-img convert -O qcow2 -c -o compression_type=[zlib|zstd]
                  src.img [zlib|zstd]_compressed.img
decompress cmd
  time ./qemu-img convert -O qcow2
                  [zlib|zstd]_compressed.img uncompressed.img

           compression               decompression
         zlib       zstd           zlib         zstd
------------------------------------------------------------
real     65.5       16.3 (-75 %)    1.9          1.6 (-16 %)
user     65.0       15.8            5.3          2.5
sys       3.3        0.2            2.0          2.0

Both ZLIB and ZSTD gave the same compression ratio: 1.57
compressed image size in both cases: 1.4G

Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
QAPI part:
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200507082521.29210-4-dplotnikov@virtuozzo.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2020-05-13 14:20:31 +02:00
..
audio.json qapi/audio: add documentation for AudioFormat 2020-03-16 10:18:07 +01:00
authz.json authz: add QAuthZList object type for an access control list 2019-02-26 15:32:18 +00:00
block-core.json qcow2: add zstd cluster compression 2020-05-13 14:20:31 +02:00
block.json qapi: Mark deprecated QMP parts with feature 'deprecated' 2020-03-17 21:43:12 +01:00
char.json qapi: Belatedly update doc comment for @wait deprecation 2020-03-17 19:58:34 +01:00
common.json qapi: Move query-target from misc.json to machine.json 2019-08-21 13:24:01 +02:00
control.json qapi: Mark deprecated QMP parts with feature 'deprecated' 2020-03-17 21:43:12 +01:00
crypto.json
dump.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
error.json qapi: Split error.json off common.json 2019-08-16 13:31:51 +02:00
introspect.json qapi: Add feature flags to struct members 2020-03-17 21:25:47 +01:00
job.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
machine-target.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
machine.json Add rx-softmmu 2020-03-19 17:58:05 +01:00
Makefile.objs qemu-storage-daemon: Add --monitor option 2020-03-06 17:21:28 +01:00
migration.json migration/xbzrle: add encoding rate 2020-05-07 17:40:24 +01:00
misc-target.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
misc.json qapi: Mark deprecated QMP parts with feature 'deprecated' 2020-03-17 21:43:12 +01:00
net.json net: Complete qapi-fication of netdev_add 2020-03-17 21:50:14 +01:00
opts-visitor.c make check-unit: use after free in test-opts-visitor 2019-09-24 11:03:44 +02:00
pragma.json qapi: Create 'pragma' module 2020-03-06 17:21:28 +01:00
qapi-clone-visitor.c
qapi-dealloc-visitor.c qapi: Fix Visitor contract for start_alternate() 2020-04-30 06:51:15 +02:00
qapi-schema.json qapi: Create 'pragma' module 2020-03-06 17:21:28 +01:00
qapi-util.c qemu-common: Move qemu_isalnum() etc. to qemu/ctype.h 2019-06-11 20:22:09 +02:00
qapi-visit-core.c qapi: Assert non-input visitors see only valid narrow integers 2020-04-30 07:26:40 +02:00
qdev.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
qmp-dispatch.c qmp: fix leak on callbacks that return both value and error 2020-04-02 14:55:46 -04:00
qmp-event.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qmp-registry.c qmp: constify QmpCommand and list 2020-03-17 21:43:12 +01:00
qobject-input-visitor.c qobject: Eliminate qdict_iter(), use qdict_first(), qdict_next() 2020-04-30 06:51:15 +02:00
qobject-output-visitor.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
qom.json qapi: Flatten object-add 2020-03-06 17:21:27 +01:00
rdma.json
rocker.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
run-state.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
sockets.json qapi: Fix indent level on doc comments in json files 2020-02-15 11:41:50 +01:00
string-input-visitor.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
string-output-visitor.c cutils: Move size_to_str() from "qemu-common.h" to "qemu/cutils.h" 2019-09-19 11:57:34 +02:00
tpm.json qapi: Use explicit bulleted lists 2020-02-15 11:41:50 +01:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
trace.json qapi: Add blank lines before bulleted lists 2020-02-15 11:41:50 +01:00
transaction.json qemu-storage-daemon: Add --monitor option 2020-03-06 17:21:28 +01:00
ui.json qapi: Delete all the "foo: dropped in n.n" notes 2020-02-15 11:41:50 +01:00