Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_frames.h @ 8946:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Fri, 24 Dec 2021 18:13:51 +0300 |
| parents | b3f6ad181df4 |
| children | 6ccf3867959a |
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/* * Copyright (C) Nginx, Inc. */ #ifndef _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_ #define _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> typedef ngx_int_t (*ngx_quic_frame_handler_pt)(ngx_connection_t *c, ngx_quic_frame_t *frame, void *data); ngx_quic_frame_t *ngx_quic_alloc_frame(ngx_connection_t *c); void ngx_quic_free_frame(ngx_connection_t *c, ngx_quic_frame_t *frame); void ngx_quic_free_frames(ngx_connection_t *c, ngx_queue_t *frames); void ngx_quic_queue_frame(ngx_quic_connection_t *qc, ngx_quic_frame_t *frame); ngx_int_t ngx_quic_split_frame(ngx_connection_t *c, ngx_quic_frame_t *f, size_t len); ngx_chain_t *ngx_quic_alloc_buf(ngx_connection_t *c); ngx_chain_t *ngx_quic_copy_buf(ngx_connection_t *c, u_char *data, size_t len); ngx_chain_t *ngx_quic_copy_chain(ngx_connection_t *c, ngx_chain_t *in, size_t limit); void ngx_quic_trim_bufs(ngx_chain_t *in, size_t size); void ngx_quic_free_bufs(ngx_connection_t *c, ngx_chain_t *in); ngx_int_t ngx_quic_order_bufs(ngx_connection_t *c, ngx_chain_t **out, ngx_chain_t *in, off_t limit, off_t offset); #if (NGX_DEBUG) void ngx_quic_log_frame(ngx_log_t *log, ngx_quic_frame_t *f, ngx_uint_t tx); #else #define ngx_quic_log_frame(log, f, tx) #endif #endif /* _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_ */