Bug #46723 [Asn]: FastCGI is incredibly slow due to TCP ack delay

Edit report at http://bugs.php.net/bug.php?id=46723&edit=1 ID: 46723 Updated by: dmitry@php.net Reported by: jost_boekemeier at users dot sf dot net Summary: FastCGI is incredibly slow due to TCP ack delay Status: Assigned Type: Bug Package: CGI related Operating System: * PHP Version: 5CVS, 6CVS (2008-12-08) Assigned To: dmitry Block user comment: N New Comment: Thanks a lot. Now I'm able to reproduce the issie. It occurs only in case of persistent FastCGI connections (byte number 11 in you array is 1) and large output. Unfortunately, your patch didn't fix the bug. From time to time 1/10000 strace shows huge delay (up to 30 sec) on write() syscall. netstat -neo Proto Recv-Q Send-Q Local Address Foreign Address State Timer tcp 90501 277632 127.0.0.1:1234 127.0.0.1:59195 ESTABLISHED probe (1.11/0/0) tcp 556640 118784 127.0.0.1:59195 127.0.0.1:1234 ESTABLISHED probe (0.88/0/0) I'll think about it. Previous Comments: ------------------------------------------------------------------------ [2010-08-28 18:37:09] jost_boekemeier at users dot sf dot net Test script below: ------------- ack_delay.php --- <?php 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while($n>0); } fclose($fp); -----------end of ack_delay.php------------ REDIRECT_STATUS="200" PHP_FCGI_CHILDR="5" PHP_FCGI_MAX_REQUESTS="50000" ~/php-cgi533.patched -b 127.0.0.1:9667 #unpatched time ~/php ack_delay.php real 0m4.135s user 0m0.020s sys 0m0.023s #patched real 0m0.140s user 0m0.022s sys 0m0.028s Which means php fastcgi > 5.1.4 is more 30 times slower than 5.1.4. To reproduce: http://sourceforge.net/projects/php-java-bridge/files/RHEL_FC%20SecurityEnhancedLinux/php-java-bridge_6.2.1rc2/ PHP test script created from: http://php-java-bridge.cvs.sourceforge.net/viewvc/php-java-bridge/php-java-bridge/server/php/java/bridge/http/FCGIConnectionOutputStream.java?revision=1.2&view=markup&sortby=date and http://php-java-bridge.cvs.sourceforge.net/viewvc/php-java-bridge/php-java-bridge/server/php/java/bridge/http/FCGIConnectionInputStream.java?revision=1.2&view=markup&sortby=date Test system: Fedora 10, Linux kernel Linux version 2.6.27.5-117.fc10.i686 (mockbuild@x86-7.fedora.phx.redhat.com) (gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC) ) #1 SMP Tue Nov 18 12:19:59 EST 2008 > I don't know what is the "ack delay". As I know TCP_NODELAY just disables the > Nagle algorithm and this makes packets to be always sent ASAP. As result it > may produce more packets. Probably it may affect FastCGI only in some > specific scenarios. Please see http://en.wikipedia.org/wiki/Nagle%27s_algorithm "With both algorithms enabled, applications which do two successive writes to a TCP connection, followed by a read which will not be fulfilled until after the data from the second write has reached the destination, experience a constant delay of up to 500 milliseconds, the "ACK delay"." Regards, Jost Bökemeier ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/bug.php?id=46723 -- Edit this bug report at http://bugs.php.net/bug.php?id=46723&edit=1