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In h2_send() we used to scan pending streams and wake them up when it's possible to send, without considering the connection's state. Thus caused some excess failed calls to h2_snd_buf() during the preface on backend connections : [01|h2|4|mux_h2.c:3562] h2_wake(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:3475] h2_process(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:3326] h2_send(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:3152] h2_process_mux(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:1508] h2c_bck_send_preface(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:1379] h2c_send_settings(): entering : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:1464] h2c_send_settings(): leaving : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:1543] h2c_bck_send_preface(): leaving : h2c=0x7f1430032ed0(B,PRF) [01|h2|4|mux_h2.c:3241] h2_process_mux(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|3|mux_h2.c:3384] sent data : h2c=0x7f1430032ed0(B,STG) >>> streams woken up here [01|h2|4|mux_h2.c:3428] h2_send(): waking up pending stream : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3435] h2_send(): leaving with everything sent : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3326] h2_send(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3152] h2_process_mux(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3241] h2_process_mux(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3435] h2_send(): leaving with everything sent : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3552] h2_process(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3564] h2_wake(): leaving >>> I/O callback was already scheduled and called despite having nothing left to do [01|h2|4|mux_h2.c:3454] h2_io_cb(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3326] h2_send(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3152] h2_process_mux(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3241] h2_process_mux(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3435] h2_send(): leaving with everything sent : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:3463] h2_io_cb(): leaving >>> stream tries and fails again here! [01|h2|4|mux_h2.c:5568] h2_snd_buf(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5587] h2_snd_buf(): connection not ready, leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5398] h2_subscribe(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5408] h2_subscribe(): subscribe(send) : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5422] h2_subscribe(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5475] h2_rcv_buf(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5535] h2_rcv_buf(): leaving : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5398] h2_subscribe(): entering : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5400] h2_subscribe(): subscribe(recv) : h2c=0x7f1430032ed0(B,STG) [01|h2|4|mux_h2.c:5422] h2_subscribe(): leaving : h2c=0x7f1430032ed0(B,STG) This can happen when sending the preface, the settings, and the settings ACK. Let's simply condition the wake up on st0 >= FRAME_H as is done at other places.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)