Mercurial > hg > nginx
view auto/cc/clang @ 9086:f68fdb017141 quic
QUIC: optimized sending stream response.
When a stream is created by client, it's often the case that nginx will send
immediate response on that stream. An example is HTTP/3 request stream, which
in most cases quickly replies with at least HTTP headers.
QUIC stream init handlers are called from a posted event. Output QUIC
frames are also sent to client from a posted event, called the push event.
If the push event is posted before the stream init event, then output produced
by stream may trigger sending an extra UDP datagram. To address this, push
event is now re-posted when a new stream init event is posted.
An example is handling 0-RTT packets. Client typically sends an init packet
coalesced with a 0-RTT packet. Previously, nginx replied with a padded CRYPTO
datagram, followed by a 1-RTT stream reply datagram. Now CRYPTO and STREAM
packets are coalesced in one reply datagram, which saves bandwidth.
Other examples include coalescing 1-RTT first stream response, and
MAX_STREAMS/STREAM sent in response to ACK/STREAM.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Mon, 03 Apr 2023 16:17:12 +0400 |
parents | ceab908790c4 |
children |
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# Copyright (C) Nginx, Inc. # clang NGX_CLANG_VER=`$CC -v 2>&1 | grep 'version' 2>&1 \ | sed -n -e 's/^.*clang version \(.*\)/\1/p' \ -e 's/^.*LLVM version \(.*\)/\1/p'` echo " + clang version: $NGX_CLANG_VER" have=NGX_COMPILER value="\"clang $NGX_CLANG_VER\"" . auto/define CC_TEST_FLAGS="-pipe" # optimizations #NGX_CLANG_OPT="-O2" #NGX_CLANG_OPT="-Oz" NGX_CLANG_OPT="-O" case $CPU in pentium) # optimize for Pentium CPU_OPT="-march=pentium" NGX_CPU_CACHE_LINE=32 ;; pentiumpro | pentium3) # optimize for Pentium Pro, Pentium II and Pentium III CPU_OPT="-march=pentiumpro" NGX_CPU_CACHE_LINE=32 ;; pentium4) # optimize for Pentium 4 CPU_OPT="-march=pentium4" NGX_CPU_CACHE_LINE=128 ;; athlon) # optimize for Athlon CPU_OPT="-march=athlon" NGX_CPU_CACHE_LINE=64 ;; opteron) # optimize for Opteron CPU_OPT="-march=opteron" NGX_CPU_CACHE_LINE=64 ;; esac CC_AUX_FLAGS="$CC_AUX_FLAGS $CPU_OPT" CFLAGS="$CFLAGS -pipe $CPU_OPT" if [ ".$PCRE_OPT" = "." ]; then PCRE_OPT="-O2 -pipe $CPU_OPT" else PCRE_OPT="$PCRE_OPT -pipe" fi if [ ".$ZLIB_OPT" = "." ]; then ZLIB_OPT="-O2 -pipe $CPU_OPT" else ZLIB_OPT="$ZLIB_OPT -pipe" fi # warnings CFLAGS="$CFLAGS $NGX_CLANG_OPT -Wall -Wextra -Wpointer-arith" CFLAGS="$CFLAGS -Wconditional-uninitialized" #CFLAGS="$CFLAGS -Wmissing-prototypes" # we have a lot of unused function arguments CFLAGS="$CFLAGS -Wno-unused-parameter" # deprecated system OpenSSL library on OS X if [ "$NGX_SYSTEM" = "Darwin" ]; then CFLAGS="$CFLAGS -Wno-deprecated-declarations" fi # stop on warning CFLAGS="$CFLAGS -Werror" # debug CFLAGS="$CFLAGS -g" if [ ".$CPP" = "." ]; then CPP="$CC -E" fi