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Better recheck of dead upstream servers. Previously nginx used to mark backend again as live as soon as fail_timeout passes (10s by default) since last failure. On the other hand, detecting dead backend takes up to 60s (proxy_connect_timeout) in typical situation "backend is down and doesn't respond to any packets". This resulted in suboptimal behaviour in the above situation (up to 23% of requests were directed to dead backend with default settings). More detailed description of the problem may be found here (in Russian): http://mailman.nginx.org/pipermail/nginx-ru/2011-August/042172.html Fix is to only allow one request after fail_timeout passes, and mark backend as "live" only if this request succeeds. Note that with new code backend will not be marked "live" unless "check" request is completed, and this may take a while in some specific workloads (e.g. streaming). This is believed to be acceptable.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2011 14:22:48 +0000
parents d43d73277c5c
children d620f497c50f
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# Copyright (C) Igor Sysoev


# Borland C++ 5.5

# optimizations

# maximize speed
CFLAGS="$CFLAGS -O2"

case $CPU in
    pentium)
        # optimize for Pentium and Athlon
        CPU_OPT="-5"
    ;;

    pentiumpro)
        # optimize for Pentium Pro, Pentium II and Pentium III
        CPU_OPT="-6"
    ;;
esac

# __stdcall
#CPU_OPT="$CPU_OPT -ps"
# __fastcall
#CPU_OPT="$CPU_OPT -pr"

CFLAGS="$CFLAGS $CPU_OPT"

# multithreaded
CFLAGS="$CFLAGS -tWM"

# stop on warning
CFLAGS="$CFLAGS -w!"

# disable logo
CFLAGS="$CFLAGS -q"


# precompiled headers
CORE_DEPS="$CORE_DEPS $NGX_OBJS/ngx_config.csm"
NGX_PCH="$NGX_OBJS/ngx_config.csm"
NGX_BUILD_PCH="-H=$NGX_OBJS/ngx_config.csm"
NGX_USE_PCH="-Hu -H=$NGX_OBJS/ngx_config.csm"


# Win32 GUI mode application
#LINK="\$(CC) -laa"


# the resource file
NGX_RES="$NGX_OBJS/nginx.res"
NGX_RCC="brcc32 -fo$NGX_OBJS/nginx.res \$(CORE_INCS) $NGX_WIN32_RC"
# the pragma allows to link the resource file using bcc32 and
# to avoid the direct ilink32 calling and the c0w32.obj's WinMain/main problem
NGX_PRAGMA="#pragma resource \"$NGX_OBJS/nginx.res\""


ngx_include_opt="-I"
ngx_objout="-o"
ngx_binout="-e"
ngx_objext="obj"
ngx_binext=".exe"

ngx_long_start='@&&|
	'
ngx_long_end='|'

ngx_regex_dirsep='\\'
ngx_dirsep="\\"