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Increased the default number of output buffers. Since an output buffer can only be used for either reading or sending, small amounts of data left from the previous operation (due to some limits) must be sent before nginx will be able to read further into the buffer. Using only one output buffer can result in suboptimal behavior that manifests itself in forming and sending too small chunks of data. This is particularly painful with SPDY (or HTTP/2) where each such chunk needs to be prefixed with some header. The default flow-control window in HTTP/2 is 64k minus one bytes. With one 32k output buffer this results is one byte left after exhausting the window. With two 32k buffers the data will be read into the second free buffer before sending, thus the minimum output is increased to 32k + 1 bytes which is much better.
author Valentin Bartenev <vbart@nginx.com>
date Tue, 15 Sep 2015 17:49:15 +0300
parents 777202558122
children 76e7e20cda05
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_TIMES_H_INCLUDED_
#define _NGX_TIMES_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    time_t      sec;
    ngx_uint_t  msec;
    ngx_int_t   gmtoff;
} ngx_time_t;


void ngx_time_init(void);
void ngx_time_update(void);
void ngx_time_sigsafe_update(void);
u_char *ngx_http_time(u_char *buf, time_t t);
u_char *ngx_http_cookie_time(u_char *buf, time_t t);
void ngx_gmtime(time_t t, ngx_tm_t *tp);

time_t ngx_next_time(time_t when);
#define ngx_next_time_n      "mktime()"


extern volatile ngx_time_t  *ngx_cached_time;

#define ngx_time()           ngx_cached_time->sec
#define ngx_timeofday()      (ngx_time_t *) ngx_cached_time

extern volatile ngx_str_t    ngx_cached_err_log_time;
extern volatile ngx_str_t    ngx_cached_http_time;
extern volatile ngx_str_t    ngx_cached_http_log_time;
extern volatile ngx_str_t    ngx_cached_http_log_iso8601;
extern volatile ngx_str_t    ngx_cached_syslog_time;

/*
 * milliseconds elapsed since epoch and truncated to ngx_msec_t,
 * used in event timers
 */
extern volatile ngx_msec_t  ngx_current_msec;


#endif /* _NGX_TIMES_H_INCLUDED_ */