| /linux/net/6lowpan/ |
| H A D | Kconfig | 18 tristate "Next Header and Generic Header Compression Support"
22 Support for next header and generic header compression defined in
31 6LoWPAN IPv6 Destination Options Header compression according to
38 6LoWPAN IPv6 Fragment Header compression according to RFC6282.
44 6LoWPAN IPv6 Hop-by-Hop Options Header compression according to
51 6LoWPAN IPv6 Header compression according to RFC6282.
57 6LoWPAN IPv6 Mobility Header compression according to RFC6282.
63 6LoWPAN IPv6 Routing Header compression according to RFC6282.
69 6LoWPAN IPv6 UDP Header compression according to RFC6282.
74 6LoWPAN IPv6 Hop-by-Hop option generic header compression according
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| H A D | nhc.h | 16 * @_name: const char * of common header compression name.
17 * @_nexthdr: ipv6 nexthdr field for the header compression.
22 * @_compress: callback for compression call.
50 * struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation
52 * @name: name of the specific next header compression
57 * @compress: callback to do the header compression.
79 * lowpan_nhc_check_compression - checks if we support compression format. If
115 * lowpan_nhc_add - register a next header compression to framework
122 * lowpan_nhc_del - delete a next header compression from framework
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| H A D | nhc_udp.c | 3 * 6LoWPAN IPv6 UDP compression according to RFC6282
23 /* values for port compression, _with checksum_ ie bit 5 set to 0 */
124 pr_debug("UDP header: both ports compression to 4 bits\n"); in udp_compress()
125 /* compression value */ in udp_compress()
135 /* compression value */ in udp_compress()
146 /* compression value */ in udp_compress()
156 /* compression value */ in udp_compress()
175 MODULE_DESCRIPTION("6LoWPAN next header RFC6282 UDP compression");
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| /linux/include/linux/ |
| H A D | zstd.h | 67 * zstd_min_clevel() - minimum allowed compression level
69 * Return: The minimum allowed compression level.
74 * zstd_max_clevel() - maximum allowed compression level
76 * Return: The maximum allowed compression level.
81 * zstd_default_clevel() - default compression level
83 * Return: Default compression level.
107 * enum zstd_strategy - zstd compression search strategy
114 * struct zstd_compression_parameters - zstd compression parameters
116 * compression, and more memory needed during decompression.
117 * @chainLog: Fully searched segment. Larger means more compression,
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| H A D | zlib.h | 1 /* zlib.h -- interface of the 'zlib' general purpose compression library
53 The 'zlib' compression library provides in-memory compression and
55 data. This version of the library supports only one compression method
59 Compression can be done in a single step if the buffers are large
61 repeated calls of the compression function. In the latter case, the
74 file compression on file systems, has a larger header than zlib to maintain
110 compression library and must not be updated by the application.
114 memory management. The compression library attaches no meaning to the
128 compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
131 progress reports. After compression, total_in holds the total size of
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| H A D | zstd_lib.h | 60 zstd, short for Zstandard, is a fast lossless compression algorithm, targeting
61 real-time compression scenarios at zlib-level and better compression ratios.
62 The zstd compression library provides in-memory compression and decompression
65 The library supports regular compression levels from 1 up to ZSTD_maxCLevel(),
68 compression levels, which extend the range of speed vs. ratio preferences.
69 The lower the level, the faster the speed (at the cost of compression).
71 Compression can be done in:
74 - unbounded multiple steps (described as Streaming compression)
76 The compression ratio achievable on small data can be highly improved using
77 a dictionary. Dictionary compression can be performed in:
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| H A D | ppp-comp.h | 3 * ppp-comp.h - Definitions for doing PPP packet compression.
17 * various compression methods.
30 * Structure giving methods for compression/decompression.
34 int compress_proto; /* CCP compression protocol number */
53 /* Return compression statistics */
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| /linux/fs/squashfs/ |
| H A D | Kconfig | 8 filesystem for Linux. It uses zlib, lz4, lzo, xz or zstd compression
91 If in doubt, select "Single threaded compression"
94 bool "Single threaded compression"
179 ZLIB compression is the standard compression used by Squashfs
180 file systems. It offers a good trade-off between compression
192 compressed with LZ4 compression. LZ4 compression is mainly
196 LZ4 is not the standard compression used in Squashfs and so most
207 compressed with LZO compression. LZO compression is mainly
211 LZO is not the standard compression used in Squashfs and so most
222 compressed with XZ compression. XZ gives better compression than
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| /linux/usr/ |
| H A D | Kconfig | 112 prompt "Built-in initramfs compression mode"
116 initramfs will be compressed. Several compression algorithms are
117 available, which differ in efficiency, compression and
118 decompression speed. Compression speed is only relevant
125 High compression options are mostly useful for users who are
130 compression tool to compress the generated initram cpio file for
139 Use the old and well tested gzip compression algorithm. Gzip provides
140 a good balance between compression ratio and decompression speed and
141 has a reasonable compression speed. It is also more likely to be
149 It's compression ratio and speed is intermediate. Decompression speed
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| /linux/fs/jffs2/ |
| H A D | Kconfig | 9 levelling, compression and support for hard links. You cannot use
101 bool "Advanced compression options for JFFS2"
106 compression modules, if any, are enabled in JFFS2. Removing
114 bool "JFFS2 ZLIB compression support" if JFFS2_COMPRESSION_OPTIONS
121 lossless data-compression library for use on virtually any computer
128 bool "JFFS2 LZO compression support" if JFFS2_COMPRESSION_OPTIONS
134 minilzo-based compression. Generally works better than Zlib.
140 bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS
147 bool "JFFS2 RUBIN compression support" if JFFS2_COMPRESSION_OPTIONS
154 prompt "JFFS2 default compression mode"
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| H A D | compr.c | 24 /* Actual compression mode */
27 /* Statistics for blocks stored without compression */
32 * Return 1 to use this compression
60 * @compr: Explicit compression type to use (ie, JFFS2_COMPR_ZLIB).
61 * If 0, just take the first available compression mode.
64 * @datalen: On entry, holds the amount of data available for compression.
70 * Returns: the compression type used. Zero is used to show that the data
72 * compression mode.
84 pr_warn("No memory for compressor allocation. Compression failed.\n"); in jffs2_selected_compress()
95 /* Skip if not the desired compression type */ in jffs2_selected_compress()
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| /linux/Documentation/admin-guide/blockdev/ |
| H A D | zram.rst | 10 in memory itself. These disks allow very fast I/O and compression provides
76 2) Select compression algorithm
80 currently selected (shown in square brackets) compression algorithms,
81 or change the selected compression algorithm (once the device is initialised
82 there is no way to change compression algorithm).
86 #show supported compression algorithms
90 #select lzo compression algorithm
93 For the time being, the `comp_algorithm` content shows only compression
96 3) Set compression algorithm parameters: Optional
99 Compression algorithms may support specific parameters which can be
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| /linux/drivers/media/usb/pwc/ |
| H A D | pwc-ctrl.c | 71 /* Entries for the Nala (645/646) camera; the Nala doesn't have compression
142 int frames, int *compression, int send_to_cam) in set_video_mode_Nala() argument
197 if (pdev->release < 5) { /* 4 fold compression */ in set_video_mode_Nala()
209 /* Let pwc-if.c:isoc_init know we don't support higher compression */ in set_video_mode_Nala()
210 *compression = 3; in set_video_mode_Nala()
217 int frames, int *compression, int send_to_cam) in set_video_mode_Timon() argument
222 if (size >= PSZ_MAX || *compression < 0 || *compression > 3) in set_video_mode_Timon()
232 /* Find a supported framerate with progressively higher compression */ in set_video_mode_Timon()
234 pChoose = &Timon_table[size][fps][*compression]; in set_video_mode_Timon()
237 (*compression)++; in set_video_mode_Timon()
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| /linux/drivers/crypto/nx/ |
| H A D | Kconfig | 16 tristate "Compression acceleration support"
21 Support for PowerPC Nest (NX) compression acceleration. This
30 tristate "Compression acceleration support on pSeries platform"
35 Support for PowerPC Nest (NX) compression acceleration. This
41 tristate "Compression acceleration support on PowerNV platform"
46 Support for PowerPC Nest (NX) compression acceleration. This
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| /linux/fs/f2fs/ |
| H A D | Kconfig | 96 bool "F2FS compression feature"
99 Enable filesystem-level compression on f2fs regular files,
100 multiple back-end compression algorithms are supported.
103 bool "LZO compression support"
110 bool "LZO-RLE compression support"
117 bool "LZ4 compression support"
124 bool "LZ4HC compression support"
132 bool "ZSTD compression support"
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| /linux/Documentation/networking/ |
| H A D | fib_trie.rst | 16 indexed through a subset of the key. See Level Compression.
22 child array - the "child index". See Level Compression.
26 the child array. See Path Compression.
28 Path Compression / skipped bits
34 deviations. These "skipped bits" constitute Path Compression.
39 Level Compression / child arrays
73 level compression algorithm on part of the trie.
76 Looks up a key, deletes it and runs the level compression algorithm.
82 to implement level compression.
87 level compression. This part follows the original paper pretty closely
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| /linux/Documentation/userspace-api/media/drivers/ |
| H A D | aspeed-video.rst | 9 video compressions with a wide range of video quality and compression ratio
14 * JPEG JFIF standard mode: for single frame and management compression
15 * ASPEED proprietary mode: for multi-frame and differential compression.
16 Support 2-pass (high quality) video compression scheme (Patent pending by
17 ASPEED). Provide visually lossless video compression quality or to reduce
48 that can be used to decide compression quality if High quality mode enabled
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| /linux/arch/powerpc/boot/ |
| H A D | wrapper | 24 # -Z zsuffix compression to use (gz, xz or none)
47 compression=.gz
72 echo ' [-Z (gz|xz|none)] [--no-compression] [vmlinux]' >&2
145 compression=.gz
153 compression=".$1"
156 if [ $compression = ".none" ]; then
157 compression=
167 compression=
289 compression=
320 compression=
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| /linux/Documentation/admin-guide/media/ |
| H A D | philips.rst | 95 compression (only useful with the plugin)
96 With this option you can control the compression factor that the camera
102 compression.
103 1 = low compression.
104 2 = medium compression.
105 3 = high compression.
107 High compression takes less bandwidth of course, but it could also
108 introduce some unwanted artefacts. The default is 2, medium compression.
110 compression.
112 The compression parameter does not apply to the 645 and 646 cameras
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| /linux/fs/erofs/ |
| H A D | Kconfig | 26 It also provides transparent compression and deduplication support to
27 improve storage density and maintain relatively high compression
104 bool "EROFS Data Compression Support"
108 Enable transparent compression support for EROFS file systems.
110 If you don't want to enable compression feature, say N.
118 gives better compression ratios than the default LZ4 format, at the
128 containing DEFLATE compressed data. It gives better compression
142 containing Zstandard compressed data. It gives better compression
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| /linux/fs/smb/client/ |
| H A D | compress.h | 7 * This file implements I/O compression support for SMB2 messages (SMB 3.1.1 only).
11 * MS-SMB2 "3.1.4.4 Compressing the Message" - for compression details
41 * - compression was successfully negotiated with server
42 * - server has enabled compression for the share
52 * smb_compress_alg_valid() - Validate a compression algorithm.
53 * @alg: Compression algorithm to check.
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| /linux/Documentation/staging/ |
| H A D | xz.rst | 4 XZ data compression in Linux
10 XZ is a general purpose data compression format with high compression
19 For userspace, `XZ Utils`_ provide a zlib-like compression library
50 Notes on compression options
81 For the best compression, the dictionary should be at least
85 The compression presets in XZ Utils may not be optimal when creating
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| /linux/drivers/crypto/intel/iaa/ |
| H A D | Kconfig | 2 tristate "Support for Intel(R) IAA Compression Accelerator"
7 This driver supports acceleration for compression and
13 bool "Enable Intel(R) IAA Compression Accelerator Statistics"
17 Enable statistics for the IAA compression accelerator.
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| /linux/fs/ubifs/ |
| H A D | Kconfig | 23 bool "Advanced compression options"
32 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
39 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
45 bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
50 in compression ratio over LZO. Say 'Y' if unsure.
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| /linux/fs/pstore/ |
| H A D | platform.c | 77 * pstore no longer implements compression via the crypto API, and only
78 * supports zlib deflate compression implemented using the zlib library
82 * size, and compresses ASCII text comparatively well. In terms of compression
92 MODULE_PARM_DESC(compress, "compression to use");
102 * Compression is only used for dmesg output, which consists of low-entropy
209 /* Skip if not built-in or compression disabled. */ in allocate_buf_for_compression()
217 pr_err("Unsupported compression '%s', falling back to deflate\n", in allocate_buf_for_compression()
223 * The compression buffer only needs to be as large as the maximum in allocate_buf_for_compression()
225 * compression is just stored uncompressed. in allocate_buf_for_compression()
230 pr_err("Failed %zu byte compression buffer allocation for: %s\n", in allocate_buf_for_compression()
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