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cb91ccd8a8
Major improvements have been introduced in pacing recently. Most notably, QMUX schedules emission on a millisecond resolution, which allow to use passive wait to be much CPU friendly. However, an issue remains with the pacing max credit. Unless BBR is used, it is fixed to the configured value from quic-cc-algo bind statement. This is not practical as if too low, it may drastically reduce performance due to 1ms sleep resolution. If too high, some clients will suffer from too much packet loss. This commit fixes the issue by implementing a dynamic maximum credit value based on the network condition specific to each clients. Calculation is done to fix a maximum value which should allow QMUX current tasklet context to emit enough data to cover the delay with the next tasklet invokation. As such, avg_loop_us is used to detect the process load. If too small, 1.5ms is used as minimal value, to cover the extra delay incurred by the system which will happen for a default 1ms sleep. This should be backported up to 3.1.
22 lines
493 B
C
22 lines
493 B
C
#ifndef _HAPROXY_QUIC_PACING_H
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#define _HAPROXY_QUIC_PACING_H
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#include <haproxy/quic_pacing-t.h>
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#include <haproxy/list.h>
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#include <haproxy/quic_frame.h>
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static inline void quic_pacing_init(struct quic_pacer *pacer,
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const struct quic_cc *cc)
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{
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pacer->cc = cc;
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pacer->cur = 0;
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pacer->credit = 0;
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}
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void quic_pacing_sent_done(struct quic_pacer *pacer, int sent);
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int quic_pacing_reload(struct quic_pacer *pacer);
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#endif /* _HAPROXY_QUIC_PACING_H */
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