https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219644
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: [email protected]
Reporter: [email protected]
Created attachment 183041
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183041&action=edit
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
[email protected]:/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
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
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"
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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