view auto/cc/conf @ 8398:82e174e47663

Changed keepalive_requests default to 1000 (ticket #2155). It turns out no browsers implement HTTP/2 GOAWAY handling properly, and large enough number of resources on a page results in failures to load some resources. In particular, Chrome seems to experience errors if loading of all resources requires more than 1 connection (while it is usually able to retry requests at least once, even with 2 connections there are occasional failures for some reason), Safari if loading requires more than 3 connections, and Firefox if loading requires more than 10 connections (can be configured with network.http.request.max-attempts, defaults to 10). It does not seem to be possible to resolve this on nginx side, even strict limiting of maximum concurrency does not help, and loading issues seems to be triggered by merely queueing of a request for a particular connection. The only available mitigation seems to use higher keepalive_requests value. The new default is 1000 and matches previously used default for http2_max_requests. It is expected to be enough for 99.98% of the pages (https://httparchive.org/reports/state-of-the-web?start=latest#reqTotal) even in Chrome.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 08 Apr 2021 00:16:30 +0300
parents 4925a6d13746
children 9bcc5cc94ff4
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


LINK="\$(CC)"

MAIN_LINK=
MODULE_LINK="-shared"

ngx_include_opt="-I "
ngx_compile_opt="-c"
ngx_pic_opt="-fPIC"
ngx_objout="-o "
ngx_binout="-o "
ngx_objext="o"
ngx_binext=
ngx_modext=".so"

ngx_long_start=
ngx_long_end=

ngx_regex_dirsep="\/"
ngx_dirsep='/'

ngx_regex_cont=' \\\
	'
ngx_cont=' \
	'
ngx_tab=' \
		'
ngx_spacer=

ngx_long_regex_cont=$ngx_regex_cont
ngx_long_cont=$ngx_cont

. auto/cc/name

if test -n "$CFLAGS"; then

    CC_TEST_FLAGS="$CFLAGS $NGX_CC_OPT"

    case $NGX_CC_NAME in

        ccc)
            # Compaq C V6.5-207

            ngx_include_opt="-I"
        ;;

        sunc)

            MAIN_LINK=
            MODULE_LINK="-G"

            case "$NGX_MACHINE" in

                i86pc)
                    NGX_AUX=" src/os/unix/ngx_sunpro_x86.il"
                ;;

                sun4u | sun4v)
                    NGX_AUX=" src/os/unix/ngx_sunpro_sparc64.il"
                ;;

            esac

            case $CPU in

                amd64)
                    NGX_AUX=" src/os/unix/ngx_sunpro_amd64.il"
                ;;

            esac
        ;;

    esac

else

    case $NGX_CC_NAME in
        gcc)
            # gcc 2.7.2.3, 2.8.1, 2.95.4, egcs-1.1.2
            #     3.0.4, 3.1.1, 3.2.3, 3.3.2, 3.3.3, 3.3.4, 3.4.0, 3.4.2
            #     4.0.0, 4.0.1, 4.1.0

            . auto/cc/gcc
        ;;

        clang)
            # Clang C compiler

            . auto/cc/clang
        ;;

        icc)
            # Intel C++ compiler 7.1, 8.0, 8.1

            . auto/cc/icc
        ;;

        sunc)
            # Sun C 5.7 Patch 117837-04 2005/05/11

            . auto/cc/sunc
        ;;

        ccc)
            # Compaq C V6.5-207

            . auto/cc/ccc
        ;;

        acc)
            # aCC: HP ANSI C++ B3910B A.03.55.02

            . auto/cc/acc
        ;;

        msvc*)
            # MSVC++ 6.0 SP2, MSVC++ Toolkit 2003

            . auto/cc/msvc
        ;;

        owc)
            # Open Watcom C 1.0, 1.2

            . auto/cc/owc
        ;;

        bcc)
            # Borland C++ 5.5

            . auto/cc/bcc
        ;;

    esac

    CC_TEST_FLAGS="$CC_TEST_FLAGS $NGX_CC_OPT"

fi

CFLAGS="$CFLAGS $NGX_CC_OPT"
NGX_TEST_LD_OPT="$NGX_LD_OPT"

if [ "$NGX_PLATFORM" != win32 ]; then

    if test -n "$NGX_LD_OPT"; then
        ngx_feature=--with-ld-opt=\"$NGX_LD_OPT\"
        ngx_feature_name=
        ngx_feature_run=no
        ngx_feature_incs=
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test=
        . auto/feature

        if [ $ngx_found = no ]; then
            echo $0: error: the invalid value in --with-ld-opt=\"$NGX_LD_OPT\"
            echo
            exit 1
        fi
    fi


    ngx_feature="-Wl,-E switch"
    ngx_feature_name=
    ngx_feature_run=no
    ngx_feature_incs=
    ngx_feature_path=
    ngx_feature_libs=-Wl,-E
    ngx_feature_test=
    . auto/feature

    if [ $ngx_found = yes ]; then
        MAIN_LINK="-Wl,-E"
    fi


    if [ "$NGX_CC_NAME" = "sunc" ]; then
        echo "checking for gcc builtin atomic operations ... disabled"
    else
        ngx_feature="gcc builtin atomic operations"
        ngx_feature_name=NGX_HAVE_GCC_ATOMIC
        ngx_feature_run=yes
        ngx_feature_incs=
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test="long  n = 0;
                          if (!__sync_bool_compare_and_swap(&n, 0, 1))
                              return 1;
                          if (__sync_fetch_and_add(&n, 1) != 1)
                              return 1;
                          if (n != 2)
                              return 1;
                          __sync_synchronize();"
        . auto/feature
    fi


    if [ "$NGX_CC_NAME" = "ccc" ]; then
        echo "checking for C99 variadic macros ... disabled"
    else
        ngx_feature="C99 variadic macros"
        ngx_feature_name="NGX_HAVE_C99_VARIADIC_MACROS"
        ngx_feature_run=yes
        ngx_feature_incs="#include <stdio.h>
#define var(dummy, ...)  sprintf(__VA_ARGS__)"
        ngx_feature_path=
        ngx_feature_libs=
        ngx_feature_test="char  buf[30]; buf[0] = '0';
                          var(0, buf, \"%d\", 1);
                          if (buf[0] != '1') return 1"
        . auto/feature
    fi


    ngx_feature="gcc variadic macros"
    ngx_feature_name="NGX_HAVE_GCC_VARIADIC_MACROS"
    ngx_feature_run=yes
    ngx_feature_incs="#include <stdio.h>
#define var(dummy, args...)  sprintf(args)"
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test="char  buf[30]; buf[0] = '0';
                      var(0, buf, \"%d\", 1);
                      if (buf[0] != '1') return 1"
    . auto/feature


    ngx_feature="gcc builtin 64 bit byteswap"
    ngx_feature_name="NGX_HAVE_GCC_BSWAP64"
    ngx_feature_run=no
    ngx_feature_incs=
    ngx_feature_path=
    ngx_feature_libs=
    ngx_feature_test="if (__builtin_bswap64(0)) return 1"
    . auto/feature


#    ngx_feature="inline"
#    ngx_feature_name=
#    ngx_feature_run=no
#    ngx_feature_incs="int inline f(void) { return 1 }"
#    ngx_feature_path=
#    ngx_feature_libs=
#    ngx_feature_test=
#    . auto/feature
#
#    if [ $ngx_found = yes ]; then
#    fi

fi