1knet_handle_compress(3)  Kronosnet Programmer's Manual knet_handle_compress(3)
2
3
4

NAME

6       knet_handle_compress - Set up packet compression.
7

SYNOPSIS

9       #include <libknet.h>
10
11       int knet_handle_compress(
12           knet_handle_t                      knet_h,
13           struct knet_handle_compress_cfg   *knet_handle_compress_cfg
14       );
15

DESCRIPTION

17       knet_handle_compress
18
19       knet_h - pointer to knet_handle_t
20
21       knet_handle_compress_cfg - pointer to a knet_handle_compress_cfg struc‐
22       ture
23
24       compress_model contains the model name. See  "compress_level"  for  the
25       list  of accepted values. Setting the value to "none" disables compres‐
26       sion.
27
28       compress_threshold tells the transmission thread to  NOT  compress  any
29       packets  that  are smaller than the value indicated. Default 100 bytes.
30       Set to 0 to reset to the default. Set to 1 to compress everything.  Max
31       accepted value is KNET_MAX_PACKET_SIZE.
32
33       compress_level  is  the  "level" parameter for most models: zlib: 0 (no
34       compression), 1 (minimal) .. 9 (max compression). lz4: 1 (max  compres‐
35       sion)...  9  (fastest  compression).  lz4hc:  1  (min  compression) ...
36       LZ4HC_MAX_CLEVEL (16) or LZ4HC_CLEVEL_MAX (12) depending on the version
37       of  lz4hc  libknet was built with. lzma: 0 (minimal) .. 9 (max compres‐
38       sion) bzip2: 1 (minimal) .. 9 (max compression) For lzo2 it selects the
39       algorithm  to  use: 1 : lzo1x_1_compress (default) 11 : lzo1x_1_11_com‐
40       press  12  :  lzo1x_1_12_compress   15   :   lzo1x_1_15_compress   999:
41       lzo1x_999_compress  Other  values  select the default algorithm. Please
42       refer to the documentation of the respective  compression  library  for
43       guidance about setting this value.
44
45       Implementation notes:
46
47       it is possible to enable/disable compression at any time.
48
49       nodes can be using a different compression algorithm at any time.
50
51       knet  does  NOT implement the compression algorithm directly. it relies
52       on external libraries for this functionality. Please read the libraries
53       man  pages  to figure out which algorithm/compression level is best for
54       the data you are planning to transmit.
55

STRUCTURES

57       struct knet_handle_compress_cfg {
58           char      compress_model[16];
59           uint32_t  compress_threshold;
60           int       compress_level;
61       };
62

RETURN VALUE

64       knet_handle_compress returns 0 on success -1 on error and errno is set.
65       EINVAL means that either the model or the level are not supported.
66

SEE ALSO

68       knet_handle_remove_datafd(3), knet_handle_get_stats(3),
69       knet_host_add(3), knet_handle_pmtud_setfreq(3),
70       knet_handle_pmtud_get(3), knet_host_get_id_by_host_name(3),
71       knet_host_get_status(3), knet_link_add_acl(3),
72       knet_link_get_pong_count(3), knet_link_get_priority(3),
73       knet_handle_free(3), knet_handle_enable_sock_notify(3),
74       knet_handle_get_datafd(3), knet_recv(3), knet_link_get_ping_timers(3),
75       knet_log_get_subsystem_id(3), knet_host_remove(3),
76       knet_host_enable_status_change_notify(3), knet_strtoaddr(3),
77       knet_link_rm_acl(3), knet_send(3), knet_handle_enable_pmtud_notify(3),
78       knet_handle_get_transport_reconnect_interval(3),
79       knet_link_get_enable(3), knet_link_set_priority(3),
80       knet_log_set_loglevel(3), knet_handle_get_channel(3),
81       knet_link_get_config(3), knet_link_get_link_list(3),
82       knet_get_transport_list(3), knet_get_transport_id_by_name(3),
83       knet_log_get_loglevel_id(3), knet_handle_new_ex(3),
84       knet_host_set_name(3), knet_addrtostr(3), knet_handle_setfwd(3),
85       knet_get_compress_list(3), knet_host_set_policy(3),
86       knet_get_transport_name_by_id(3), knet_handle_enable_filter(3),
87       knet_link_get_status(3), knet_handle_add_datafd(3), knet_send_sync(3),
88       knet_log_get_loglevel_name(3), knet_handle_enable_access_lists(3),
89       knet_host_get_host_list(3), knet_host_get_policy(3),
90       knet_link_set_enable(3), knet_link_set_pong_count(3),
91       knet_log_get_subsystem_name(3), knet_host_get_name_by_host_id(3),
92       knet_link_clear_config(3), knet_log_get_loglevel(3),
93       knet_handle_new(3), knet_handle_pmtud_getfreq(3),
94       knet_handle_pmtud_set(3), knet_handle_clear_stats(3),
95       knet_link_set_config(3), knet_handle_crypto(3),
96       knet_get_crypto_list(3),
97       knet_handle_set_transport_reconnect_interval(3),
98       knet_link_clear_acl(3), knet_link_set_ping_timers(3),
99       knet_link_insert_acl(3)
100

102       Copyright (C) 2010-2020 Red Hat, Inc. All rights reserved.
103
104
105
106kronosnet                         2020-04-23           knet_handle_compress(3)
Impressum