1knet_handle_compress(3)  Kronosnet Programmer's Manual knet_handle_compress(3)
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NAME

6       knet_handle_compress - Set up packet compression.
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SYNOPSIS

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

17       knet_handle_compress
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19       knet_h - pointer to knet_handle_t
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21       knet_handle_compress_cfg - pointer to a knet_handle_compress_cfg struc‐
22       ture
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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.
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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.
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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.
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45       Implementation notes:
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47       it is possible to enable/disable compression at any time.
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49       nodes can be using a different compression algorithm at any time.
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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.
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STRUCTURES

57       struct knet_handle_compress_cfg {
58           char      compress_model[16];
59           uint32_t  compress_threshold;
60           int       compress_level;
61       };
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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.
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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_get_pong_count(3),
72       knet_link_get_priority(3), knet_handle_free(3),
73       knet_handle_enable_sock_notify(3), knet_handle_get_datafd(3),
74       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_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_host_get_host_list(3),
89       knet_host_get_policy(3), knet_link_set_enable(3),
90       knet_link_set_pong_count(3), knet_log_get_subsystem_name(3),
91       knet_host_get_name_by_host_id(3), knet_link_clear_config(3),
92       knet_log_get_loglevel(3), knet_handle_new(3),
93       knet_handle_pmtud_getfreq(3), knet_handle_clear_stats(3),
94       knet_link_set_config(3), knet_handle_crypto(3),
95       knet_get_crypto_list(3),
96       knet_handle_set_transport_reconnect_interval(3),
97       knet_link_set_ping_timers(3)
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100       Copyright (C) 2010-2019 Red Hat, Inc. All rights reserved.
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104kronosnet                         2019-05-09           knet_handle_compress(3)
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