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This setting is used to limit memory usage without causing the alloc failures caused by "-m". Unexpectedly, tests have shown a performance boost of up to about 18% on HTTP traffic when limiting the number of buffers to about 10% of the amount of concurrent connections. tune.buffers.limit <number> Sets a hard limit on the number of buffers which may be allocated per process. The default value is zero which means unlimited. The minimum non-zero value will always be greater than "tune.buffers.reserve" and should ideally always be about twice as large. Forcing this value can be particularly useful to limit the amount of memory a process may take, while retaining a sane behaviour. When this limit is reached, sessions which need a buffer wait for another one to be released by another session. Since buffers are dynamically allocated and released, the waiting time is very short and not perceptible provided that limits remain reasonable. In fact sometimes reducing the limit may even increase performance by increasing the CPU cache's efficiency. Tests have shown good results on average HTTP traffic with a limit to 1/10 of the expected global maxconn setting, which also significantly reduces memory usage. The memory savings come from the fact that a number of connections will not allocate 2*tune.bufsize. It is best not to touch this value unless advised to do so by an haproxy core developer. |
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| .. | ||
| acl.h | ||
| arg.h | ||
| auth.h | ||
| backend.h | ||
| capture.h | ||
| channel.h | ||
| checks.h | ||
| compression.h | ||
| connection.h | ||
| counters.h | ||
| fd.h | ||
| freq_ctr.h | ||
| global.h | ||
| hdr_idx.h | ||
| lb_chash.h | ||
| lb_fas.h | ||
| lb_fwlc.h | ||
| lb_fwrr.h | ||
| lb_map.h | ||
| listener.h | ||
| log.h | ||
| map.h | ||
| obj_type.h | ||
| pattern.h | ||
| peers.h | ||
| pipe.h | ||
| port_range.h | ||
| proto_http.h | ||
| proto_tcp.h | ||
| protocol.h | ||
| proxy.h | ||
| queue.h | ||
| sample.h | ||
| server.h | ||
| session.h | ||
| signal.h | ||
| ssl_sock.h | ||
| stick_table.h | ||
| stream_interface.h | ||
| task.h | ||
| template.h | ||