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Date:      Mon, 29 May 2017 21:44:36 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes
Message-ID:  <bug-219644-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219644

            Bug ID: 219644
           Summary: FreeBSD 11 + nginx + apache delay +0.1 second on files
                    greater than 32768 bytes
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: freebsd@ihead.ru

Created attachment 183041
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D183041&action=
=3Dedit
test file (size large than 32768 bytes)

FreeBSD freebsd11.build.ihead.ru 11.0-RELEASE-p8 FreeBSD 11.0-RELEASE-p8 #0:
Wed Feb 22 06:12:04 UTC 2017=20=20=20=20
root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

Proxy requests from nginx to apache.
If apache response more than 32768 bytes (with headers) the request longed =
on
~0.1 second.

How to reproduce.
1. In httpd.conf add
Listen 127.0.0.1:80
MaxClients 1

2. Add ihead.txt in DocumentRoot (/usr/local/www/apache24/data).
It may be any file larger than 32768 bytes.

3. In nginx.conf in server {...} add=20
location /ihead.txt {
proxy_pass http://127.0.0.1:80;
}

4. find nginx and apache PIDs
ps -aux | grep nginx
ps -aux | grep httpd

5. run ktrace on finded PIDs=20
ktrace -p 42260 -t cfinpstuwy -f nginx
ktrace -p 42184 -t cfinpstuwy -f apache

6. Request http://IP_nginx/ihead.txt

7. Stop ktrace
ktrace -C

8. Make dumps readable
kdump -E -f nginx > nginx.txt
kdump -E -f apache > apache.txt

9. There is +0.1 second delay
 42260 nginx    0.004903 CSW   stop kernel "kqread"
 42260 nginx    0.110929 CSW   resume kernel "kqread"=20

 42184 httpd    0.000591 CSW   stop kernel "select"
 42184 httpd    0.199081 CSW   resume kernel "select"


Problem not reproduced on FreeBSD 10.

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