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/qemu/docs/
H A Dmulti-thread-compression.txt1 Use multiple thread (de)compression in live migration
21 be decompressed. Using compression in live migration can help
27 The process of compression will consume additional CPU cycles, and the
30 the total migration time. If the process of the compression is quick
32 thread compression can be used to accelerate the compression process.
35 compression, if the source and destination CPU have equal speed,
36 keeping the compression thread count 4 times the decompression
39 Compression level can be used to control the compression speed and the
40 compression ratio. High compression ratio will take more time, level 0
41 stands for no compression, level 1 stands for the best compression
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/qemu/docs/devel/migration/
H A Dqpl-compression.rst5 provide compression and decompression features and it is based on deflate
6 compression algorithm (RFC 1951).
8 The ``QPL`` compression relies on Intel In-Memory Analytics Accelerator(``IAA``)
115 - 8 engines and 1 work queue are configured in group 0, so all compression jobs
163 The multifd migration with ``QPL`` compression method will use all work
204 4 - Enable ``QPL`` compression during migration
206 Set ``migrate_set_parameter multifd-compression qpl`` when migrating, the
207 ``QPL`` compression does not support configuring the compression level, it
208 only supports one compression level.
213 Although both ``QPL`` and ``ZLIB`` are based on the deflate compression
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H A Dfeatures.rst15 qpl-compression
16 uadk-compression
17 qatzip-compression
H A Duadk-compression.rst6 hardware acceleration of cryptographic and compression algorithms.
13 UACCE. Through the UADK framework, users can run cryptographic and compression
132 * Enable ``UADK`` compression during migration
134 Set ``migrate_set_parameter multifd-compression uadk``
142 Though both UADK and ZLIB are based on the deflate compression algorithm, UADK
H A Dqatzip-compression.rst5 users save a lot of host CPU resources by accelerating compression and
37 Technology to provide extended accelerated compression and decompression
115 3 - Set ``migrate_set_parameter multifd-compression qatzip``
159 lot of host CPU resources for compression.
/qemu/ui/
H A Dvnc-enc-zlib.c79 err = deflateInit2(zstream, vs->tight->compression, Z_DEFLATED, in vnc_zlib_stop()
88 vs->zlib.level = vs->tight->compression; in vnc_zlib_stop()
92 if (vs->tight->compression != vs->zlib.level) { in vnc_zlib_stop()
93 if (deflateParams(zstream, vs->tight->compression, in vnc_zlib_stop()
97 vs->zlib.level = vs->tight->compression; in vnc_zlib_stop()
H A Dvnc-enc-tight.c299 int compression = vs->tight->compression; in tight_detect_smooth_image() local
317 if (w * h < tight_conf[compression].gradient_min_rect_size) { in tight_detect_smooth_image()
328 return (errors < tight_conf[compression].gradient_threshold24); in tight_detect_smooth_image()
338 return (errors < tight_conf[compression].gradient_threshold); in tight_detect_smooth_image()
426 max = count / tight_conf[vs->tight->compression].idx_max_colors_divisor; in tight_fill_palette()
428 count >= tight_conf[vs->tight->compression].mono_min_rect_size) { in tight_fill_palette()
939 tight_conf[vs->tight->compression].raw_zlib_level, in send_full_color_rect()
967 int level = tight_conf[vs->tight->compression].mono_zlib_level; in send_mono_rect()
1052 int level = tight_conf[vs->tight->compression].gradient_zlib_level; in send_gradient_rect()
1089 int level = tight_conf[vs->tight->compression].idx_zlib_level; in send_palette_rect()
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H A Dspice-core.c666 spice_image_compression_t compression; in qemu_spice_init() local
775 compression = SPICE_IMAGE_COMPRESS_AUTO_GLZ; in qemu_spice_init()
778 compression = parse_compression(str); in qemu_spice_init()
780 spice_server_set_image_compression(spice_server, compression); in qemu_spice_init()
/qemu/tests/qemu-iotests/
H A D28764 _qcow2_dump_header --no-filter-compression | grep incompatible_features
70 _qcow2_dump_header --no-filter-compression | grep incompatible_features
78 _qcow2_dump_header --no-filter-compression | grep incompatible_features
90 _qcow2_dump_header --no-filter-compression | grep incompatible_features
H A D242.out15 compression type: COMPRESSION_TYPE
37 compression type: COMPRESSION_TYPE
71 compression type: COMPRESSION_TYPE
113 compression type: COMPRESSION_TYPE
164 compression type: COMPRESSION_TYPE
H A D287.out3 === Testing compression type incompatible bit setting for zlib ===
8 === Testing compression type incompatible bit setting for zstd ===
23 === Testing compression type values ===
H A D082.out20 compression type: COMPRESSION_TYPE
34 compression type: COMPRESSION_TYPE
55 compression_type=<str> - Compression method used for image cluster compression
81 compression_type=<str> - Compression method used for image cluster compression
107 compression_type=<str> - Compression method used for image cluster compression
133 compression_type=<str> - Compression method used for image cluster compression
159 compression_type=<str> - Compression method used for image cluster compression
185 compression_type=<str> - Compression method used for image cluster compression
211 compression_type=<str> - Compression method used for image cluster compression
237 compression_type=<str> - Compression method used for image cluster compression
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H A D198.out39 compression type: COMPRESSION_TYPE
85 compression type: COMPRESSION_TYPE
H A D206.out21 compression type: COMPRESSION_TYPE
45 compression type: COMPRESSION_TYPE
69 compression type: COMPRESSION_TYPE
95 compression type: COMPRESSION_TYPE
112 compression type: COMPRESSION_TYPE
H A D274.out50 compression type: COMPRESSION_TYPE
76 compression type: COMPRESSION_TYPE
108 compression type: COMPRESSION_TYPE
132 compression type: COMPRESSION_TYPE
164 compression type: COMPRESSION_TYPE
H A D302.out20 compression type: COMPRESSION_TYPE
H A D314.out8 === Testing rebase with compression onto no backing file ===
24 === Testing rebase with compression with raw backing file ===
H A D061.out554 compression type: COMPRESSION_TYPE
583 compression type: COMPRESSION_TYPE
600 compression type: COMPRESSION_TYPE
616 compression type: COMPRESSION_TYPE
630 compression type: COMPRESSION_TYPE
645 compression type: COMPRESSION_TYPE
/qemu/qapi/
H A Dmigration.json106 # Detailed migration compression statistics
115 # @compressed-size: amount of bytes after compression
117 # @compression-rate: rate of compressed size
123 'compressed-size': 'int', 'compression-rate': 'number' } }
562 # An enumeration of multifd compression methods.
564 # @none: no compression.
566 # @zlib: use zlib compression method.
568 # @zstd: use zstd compression method.
570 # @qatzip: use qatzip compression method. (Since 9.2)
572 # @qpl: use qpl compression method. Query Processing Library(qpl) is
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H A Ddump.json19 # zlib compression
22 # compression
25 # snappy compression
28 # compression (since 8.2)
31 # compression (since 8.2)
34 # compression (since 8.2)
/qemu/
H A Dmeson_options.txt198 description: 'lzo compression support')
218 description: 'snappy compression support')
250 description: 'JPEG lossy compression for VNC server')
265 description: 'zstd compression support')
271 description: 'QATzip compression support')
/qemu/docs/interop/
H A Dqcow2.rst122 a non-default compression is used for compressed
220 Defines the compression method used for compressed clusters.
221 All compressed clusters in an image use the same compression
226 compression type). Otherwise, this field must not be present
229 Available compression type values:
233 The deflate compression type is called "zlib"
235 deflate compression type do not have zlib headers.
H A Ddbus.rst13 - background tasks (compression, streaming etc)
/qemu/docs/system/arm/
H A Dnuvoton.rst85 * Encoding compression engine
/qemu/docs/tools/
H A Dqemu-img.rst112 For qcow2, the compression algorithm can be specified with the ``-o
429 Only the formats ``qcow`` and ``qcow2`` support compression. The
430 compression is read-only. It means that if a compressed sector is
785 on Windows), optional AES encryption, zlib or zstd based compression and
804 This option configures which compression algorithm will be used for
808 with the ``compress`` filter driver or backup block jobs with compression
812 ``compat=0.10``, only ``zlib`` compression is available.

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