[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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Lawrence Stewart  changed:

   What|Removed |Added

 CC||lstew...@freebsd.org
   Assignee|freebsd-bugs@FreeBSD.org|lstew...@freebsd.org

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #23 from free...@ihead.ru ---
Yes, I have workaround (sysctl net.inet.tcp.delayed_ack=0) and it works.
But I not sure is it ok, and what problems it may bring in other parts of
network stack.

By the way, the problem exists on default setup, and this is not good.
People may think, that FreeBSD is slow.

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #22 from Maxim Konovalov  ---
(In reply to freebsd from comment #21)

You've got the workaround, right?  Does it work for you?

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #21 from free...@ihead.ru ---
Problem is reproduced on FreeBSD 11.1.

FreeBSD 11.1-RELEASE-p1 #0: Wed Aug  9 11:55:48 UTC 2017
r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

Why nobody cares about it?

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #20 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #19)

sysctl net.inet.tcp.initcwnd_segments=40
net.inet.tcp.initcwnd_segments: 10 -> 40

result: no problem

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #19 from Maxim Konovalov  ---
Can you run one more experiments for me please?  Specifically re-run your test
with the following sysctl before:

sysctl net.inet.tcp.initcwnd_segments=40

Thanks,

Maxim

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #18 from free...@ihead.ru ---
Can anybody help with this?
Is is easy reproduceble FreeBSD11's strange behavior.

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #17 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #16)
Hi.
I got diff from https://svnweb.freebsd.org/base?view=revision=319397
rebuild and install kernel.

It did not help.

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #16 from Maxim Konovalov  ---
Hello,

I haven't had a change to dig further so far but just noticed this bug report:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211003

It could be related to the issue you observe.

Can you try to update FreeBSD 11.0 to @319397 and check if it still manifest
itself?

Thanks,

Maxim

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #15 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #14)

nginx.conf is identical on both systems.


#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pidlogs/nginx.pid;


events {
worker_connections  1024;
}


http {
include   mime.types;
default_type  application/octet-stream;

#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
#  '$status $body_bytes_sent "$http_referer" '
#  '"$http_user_agent" "$http_x_forwarded_for"';

#access_log  logs/access.log  main;

sendfileon;
#tcp_nopush on;

#keepalive_timeout  0;
keepalive_timeout  65;

#gzip  on;

server {
listen   80;
server_name  localhost;

#charset koi8-r;

#access_log  logs/host.access.log  main;

location / {
root   html;
index  index.html index.htm;
}

#error_page  404  /404.html;

# redirect server error pages to the static page /50x.html
#
error_page   500 502 503 504  /50x.html;
location = /50x.html {
root   html;
}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
#proxy_pass   http://127.0.0.1;
#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
#root   html;
#fastcgi_pass   127.0.0.1:9000;
#fastcgi_index  index.php;
#fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
#includefastcgi_params;
#}

# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
#deny  all;
#}

location /ihead.txt {
proxy_pass http://127.0.0.1:80;
}
}

}

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #14 from Maxim Konovalov  ---
Can you also share your nginx.conf from both systems please?

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #13 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #12)

[root@freebsd10 ~]# sysctl net.inet.tcp
net.inet.tcp.rfc1323: 1
net.inet.tcp.mssdflt: 536
net.inet.tcp.keepidle: 720
net.inet.tcp.keepintvl: 75000
net.inet.tcp.sendspace: 32768
net.inet.tcp.recvspace: 65536
net.inet.tcp.keepinit: 75000
net.inet.tcp.delacktime: 100
net.inet.tcp.v6mssdflt: 1220
net.inet.tcp.nolocaltimewait: 0
net.inet.tcp.maxtcptw: 12950
net.inet.tcp.per_cpu_timers: 0
net.inet.tcp.v6pmtud_blackhole_mss: 1220
net.inet.tcp.pmtud_blackhole_mss: 1200
net.inet.tcp.pmtud_blackhole_failed: 0
net.inet.tcp.pmtud_blackhole_activated_min_mss: 0
net.inet.tcp.pmtud_blackhole_activated: 0
net.inet.tcp.pmtud_blackhole_detection: 0
net.inet.tcp.rexmit_drop_options: 0
net.inet.tcp.keepcnt: 8
net.inet.tcp.finwait2_timeout: 6
net.inet.tcp.fast_finwait2_recycle: 0
net.inet.tcp.always_keepalive: 1
net.inet.tcp.rexmit_slop: 200
net.inet.tcp.rexmit_min: 30
net.inet.tcp.msl: 3
net.inet.tcp.persmax: 6
net.inet.tcp.persmin: 5000
net.inet.tcp.syncache.rst_on_sock_fail: 1
net.inet.tcp.syncache.rexmtlimit: 3
net.inet.tcp.syncache.hashsize: 512
net.inet.tcp.syncache.count: 0
net.inet.tcp.syncache.cachelimit: 15375
net.inet.tcp.syncache.bucketlimit: 30
net.inet.tcp.syncookies_only: 0
net.inet.tcp.syncookies: 1
net.inet.tcp.soreceive_stream: 0
net.inet.tcp.isn_reseed_interval: 0
net.inet.tcp.icmp_may_rst: 1
net.inet.tcp.pcbcount: 4
net.inet.tcp.do_tcpdrain: 1
net.inet.tcp.tcbhashsize: 16384
net.inet.tcp.log_debug: 0
net.inet.tcp.minmss: 216
net.inet.tcp.sack.globalholes: 0
net.inet.tcp.sack.globalmaxholes: 65536
net.inet.tcp.sack.maxholes: 128
net.inet.tcp.sack.enable: 1
net.inet.tcp.reass.overflows: 9
net.inet.tcp.reass.cursegments: 0
net.inet.tcp.reass.maxsegments: 7900
net.inet.tcp.sendbuf_max: 2097152
net.inet.tcp.sendbuf_inc: 8192
net.inet.tcp.sendbuf_auto: 1
net.inet.tcp.tso: 1
net.inet.tcp.path_mtu_discovery: 1
net.inet.tcp.recvbuf_max: 2097152
net.inet.tcp.recvbuf_inc: 16384
net.inet.tcp.recvbuf_auto: 1
net.inet.tcp.insecure_rst: 0
net.inet.tcp.ecn.maxretries: 1
net.inet.tcp.ecn.enable: 0
net.inet.tcp.abc_l_var: 2
net.inet.tcp.rfc3465: 1
net.inet.tcp.experimental.initcwnd10: 1
net.inet.tcp.rfc3390: 1
net.inet.tcp.rfc3042: 1
net.inet.tcp.do_pipe: 0
net.inet.tcp.drop_synfin: 0
net.inet.tcp.delayed_ack: 1
net.inet.tcp.blackhole: 0
net.inet.tcp.log_in_vain: 0
net.inet.tcp.hostcache.purge: 0
net.inet.tcp.hostcache.prune: 300
net.inet.tcp.hostcache.expire: 3600
net.inet.tcp.hostcache.count: 0
net.inet.tcp.hostcache.bucketlimit: 30
net.inet.tcp.hostcache.hashsize: 512
net.inet.tcp.hostcache.cachelimit: 15360
net.inet.tcp.cc.available: newreno
net.inet.tcp.cc.algorithm: newreno

[root@freebsd11 ~]# sysctl net.inet.tcp
net.inet.tcp.rfc1323: 1
net.inet.tcp.mssdflt: 536
net.inet.tcp.keepidle: 720
net.inet.tcp.keepintvl: 75000
net.inet.tcp.sendspace: 32768
net.inet.tcp.recvspace: 65536
net.inet.tcp.keepinit: 75000
net.inet.tcp.delacktime: 100
net.inet.tcp.v6mssdflt: 1220
net.inet.tcp.nolocaltimewait: 0
net.inet.tcp.maxtcptw: 12900
net.inet.tcp.per_cpu_timers: 0
net.inet.tcp.v6pmtud_blackhole_mss: 1220
net.inet.tcp.pmtud_blackhole_mss: 1200
net.inet.tcp.pmtud_blackhole_failed: 0
net.inet.tcp.pmtud_blackhole_activated_min_mss: 0
net.inet.tcp.pmtud_blackhole_activated: 0
net.inet.tcp.pmtud_blackhole_detection: 0
net.inet.tcp.rexmit_drop_options: 0
net.inet.tcp.keepcnt: 8
net.inet.tcp.finwait2_timeout: 6
net.inet.tcp.fast_finwait2_recycle: 0
net.inet.tcp.always_keepalive: 1
net.inet.tcp.rexmit_slop: 200
net.inet.tcp.rexmit_min: 30
net.inet.tcp.msl: 3
net.inet.tcp.persmax: 6
net.inet.tcp.persmin: 5000
net.inet.tcp.syncache.rst_on_sock_fail: 1
net.inet.tcp.syncache.rexmtlimit: 3
net.inet.tcp.syncache.hashsize: 512
net.inet.tcp.syncache.count: 0
net.inet.tcp.syncache.cachelimit: 15364
net.inet.tcp.syncache.bucketlimit: 30
net.inet.tcp.syncookies_only: 0
net.inet.tcp.syncookies: 1
net.inet.tcp.functions_available:
Stack   D PCB count
default * 4

net.inet.tcp.functions_default: default
net.inet.tcp.soreceive_stream: 0
net.inet.tcp.isn_reseed_interval: 0
net.inet.tcp.icmp_may_rst: 1
net.inet.tcp.pcbcount: 4
net.inet.tcp.do_tcpdrain: 1
net.inet.tcp.tcbhashsize: 16384
net.inet.tcp.log_debug: 0
net.inet.tcp.minmss: 216
net.inet.tcp.sack.globalholes: 0
net.inet.tcp.sack.globalmaxholes: 65536
net.inet.tcp.sack.maxholes: 128
net.inet.tcp.sack.enable: 1
net.inet.tcp.reass.cursegments: 0
net.inet.tcp.reass.maxsegments: 7900
net.inet.tcp.sendbuf_max: 2097152
net.inet.tcp.sendbuf_inc: 8192
net.inet.tcp.sendbuf_auto: 1
net.inet.tcp.tso: 1
net.inet.tcp.path_mtu_discovery: 1
net.inet.tcp.recvbuf_max: 2097152
net.inet.tcp.recvbuf_inc: 16384
net.inet.tcp.recvbuf_auto: 1
net.inet.tcp.insecure_rst: 0
net.inet.tcp.insecure_syn: 0
net.inet.tcp.ecn.maxretries: 1
net.inet.tcp.ecn.enable: 2
net.inet.tcp.abc_l_var: 2

[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #12 from Maxim Konovalov  ---
Can you share please "sysctl net.inet.tcp" on your FreeBSD 10 and FreeBSD 11?

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #11 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #9)

[root@freebsd10 ~]# uname -a
FreeBSD freebsd10.build.ihead.ru 10.3-RELEASE-p18 FreeBSD 10.3-RELEASE-p18 #0:
Tue Apr 11 10:31:00 UTC 2017
r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
[root@freebsd10 ~]# sysctl net.inet.tcp.delayed_ack
net.inet.tcp.delayed_ack: 1
[root@freebsd10 ~]# sysctl sysctl net.inet.tcp.delacktime
net.inet.tcp.delacktime: 100

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #10 from free...@ihead.ru ---
(In reply to Maxim Konovalov from comment #9)

Defaults are:

sysctl net.inet.tcp.delayed_ack
net.inet.tcp.delayed_ack: 1

sysctl net.inet.tcp.delacktime
net.inet.tcp.delacktime: 100

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #9 from Maxim Konovalov  ---
What are delayed_ack settings on your FreeBSD 10 system?

Are they non default?

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #8 from free...@ihead.ru ---
sysctl net.inet.tcp.delayed_ack
net.inet.tcp.delayed_ack: 1

sysctl net.inet.tcp.delacktime
net.inet.tcp.delacktime: 100

1)
sysctl net.inet.tcp.delayed_ack=0
net.inet.tcp.delayed_ack: 1 -> 0

Problem is not reproduced.

2)
sysctl net.inet.tcp.delayed_ack=1
net.inet.tcp.delayed_ack: 0 -> 1

sysctl net.inet.tcp.delacktime=200
net.inet.tcp.delacktime: 100 -> 200

Problem is reproduced with +0.2 seconds delay.

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #7 from free...@ihead.ru ---
Created attachment 183064
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183064=edit
tcpdump on FresBSD11

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #6 from free...@ihead.ru ---
Created attachment 183063
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183063=edit
tcpdump on FresBSD10

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #5 from free...@ihead.ru ---
Created attachment 183062
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183062=edit
apache ktrace on FreeBSD10

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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--- Comment #4 from free...@ihead.ru ---
Created attachment 183061
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183061=edit
nginx ktrace on FreeBSD10

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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Maxim Konovalov  changed:

   What|Removed |Added

 CC||ma...@freebsd.org

--- Comment #3 from Maxim Konovalov  ---
Hello,

As was suggested in nginx trac ticket gathering tcpdump on FreeBSD 11 and 10
would be useful as well.

Also, comparing problematic traces with FreeBSD 10 is also a good idea.

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

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free...@ihead.ru changed:

   What|Removed |Added

   Severity|Affects Only Me |Affects Many People

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--- Comment #2 from free...@ihead.ru ---
Created attachment 183043
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183043=edit
kdump -E -f apache > apache.txt

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--- Comment #1 from free...@ihead.ru ---
Created attachment 183042
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183042=edit
kdump -E -f nginx > nginx.txt

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[Bug 219644] FreeBSD 11 + nginx + apache delay +0.1 second on files greater than 32768 bytes

[bugzilla-noreply]

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: freebsd-bugs@FreeBSD.org
  Reporter: free...@ihead.ru

Created attachment 183041
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183041=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
r...@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 
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 nginx0.004903 CSW   stop kernel "kqread"
 42260 nginx0.110929 CSW   resume kernel "kqread" 

 42184 httpd0.000591 CSW   stop kernel "select"
 42184 httpd0.199081 CSW   resume kernel "select"


Problem not reproduced on FreeBSD 10.

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