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comparison src/os/unix/ngx_freebsd_sendfile_chain.c @ 201:267ea1d98683

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nginx-0.0.1-2003-11-30-23:03:18 import
author Igor Sysoev <igor@sysoev.ru>
date Sun, 30 Nov 2003 20:03:18 +0000
parents 0b81c7a0b133
children c9da5900c79e
comparison
equal deleted inserted replaced
200:abeaebe0a33c 201:267ea1d98683
3 #include <ngx_core.h> 3 #include <ngx_core.h>
4 #include <ngx_event.h> 4 #include <ngx_event.h>
5 5
6 6
7 /* 7 /*
8 * sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460 and 1176 8 * FreeBSD's sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460
9 * or in 6 packets: 5x1460 and 892. Besides although sendfile() allows 9 * and 1176 or in 6 packets: 5x1460 and 892. Besides although sendfile()
10 * to pass the header and the trailer it never sends the header or the trailer 10 * allows to pass the header and the trailer it never sends the header or
11 * with the part of the file in one packet. So we use TCP_NOPUSH (similar 11 * the trailer with the part of the file in one packet. So we use TCP_NOPUSH
12 * to Linux's TCP_CORK) to postpone the sending - it not only sends the header 12 * (similar to Linux's TCP_CORK) to postpone the sending - it not only sends
13 * and the first part of the file in one packet but also sends 4K pages 13 * the header and the first part of the file in one packet but also sends
14 * in the full packets. 14 * 4K pages in the full packets.
15 * 15 *
16 * Until FreeBSD 4.5 the turning TCP_NOPUSH off does not flush the pending 16 * Until FreeBSD 4.5 the turning TCP_NOPUSH off does not flush a pending
17 * data that less than MSS so the data can be sent with 5 second delay. 17 * data that less than MSS so that data can be sent with 5 second delay.
18 * We do not use TCP_NOPUSH on FreeBSD prior to 4.5 although it can be used 18 * We do not use TCP_NOPUSH on FreeBSD prior to 4.5 although it can be used
19 * for non-keepalive HTTP connections. 19 * for non-keepalive HTTP connections.
20 */ 20 */
21 21
22 22