Sponsored Content
Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044048 by Neo on Thursday 13th of February 2020 03:46:50 AM
Old 02-13-2020
Quote:
Originally Posted by vbe
Code:
[5885167.576271] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters.
[5942225.927974] r8169 0000:01:00.0 enp1s0: link down
[5942286.125907] r8169 0000:01:00.0 enp1s0: link up
[6100421.130628] TCP: request_sock_TCP: Possible SYN flooding on port 443. Sending cookies.  Check SNMP counters. Did you find anything here?
[6848807.673874] DCCP: Activated CCID 2 (TCP-like)
[6848807.681997] sctp: Hash tables configured (bind 1024/1024)
[8210127.728955] md: data-check of RAID array md0
[8210127.742698] md: delaying data-check of md1 until md0 has finished (they share one or more physical units) Due to your check?
[8210127.780876] md: delaying data-check of md2 until md1 has finished (they share one or more physical units)
[8210130.257361] md: md0: data-check done.
[8210130.260788] md: data-check of RAID array md1
[8210170.116940] md: md1: data-check done.
[8210170.121703] md: data-check of RAID array md2
[8212579.951548] md: md2: data-check done.

Based on prior experience, a SYN Flood attack msg in dmesg is a fraction of the traffic the site has (it's noise), so I don't think that is an issue (it's noise, I think... not "signal" .... ).

There is no I/O spike (network I/O) as mentioned earlier (in case you missed it).

There is zero correlation between network I/0 and the load spike.

I do not think it is network I/O related.

The site gets tons of bot traffic from wayward bots globally, and there would be a correlation, but there is also no correlation between bots, network i/o, etc. None.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

load average

we have an unix system which has load average normally about 20. but while i am running a particular unix batch which performs heavy operations on filesystem and database average load reduces to 15. how can we explain this situation? while running that batch idle cpu time is about %60-65... (0 Replies)
Discussion started by: gfhgfnhhn
0 Replies

2. UNIX for Dummies Questions & Answers

Load Average

Hello all, I have a question about load averages. I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Discussion started by: Heathe_Kyle
3 Replies

3. UNIX for Dummies Questions & Answers

top - Load average

Hello, Here is the output of top command. My understanding here is, the load average 0.03 in last 1 min, 0.02 is in last 5 min, 0.00 is in last 15 min. By seeing this load average, When can we say that, the system load averge is too high? When can we say that, load average is medium/low??... (8 Replies)
Discussion started by: govindts
8 Replies

4. Solaris

load average query.

Hi, i have installed solaris 10 on t-5120 sparc enterprise. I am little surprised to see load average of 2 or around on this OS. when checked with ps command following process is using highest CPU. looks like it is running for long time and does not want to stop, but I do not know... (5 Replies)
Discussion started by: upengan78
5 Replies

5. UNIX for Dummies Questions & Answers

Please Help me in my load average

Hello AlL,.. I want from experts to help me as my load average is increased and i dont know where is the problem !! this is my top result : root@a4s # top top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66 Mem: 8168788k total, 2889596k used, 5279192k free, 47792k... (3 Replies)
Discussion started by: black-code
3 Replies

6. UNIX for Advanced & Expert Users

Load average in UNIX

Hi , I am using 48 CPU sunOS server at my work. The application has facility to check the current load average before starting a new process to control the load. Right now it is configured as 48. So it does mean that each CPU can take maximum one proces and no processe is waiting. ... (2 Replies)
Discussion started by: kumaran_5555
2 Replies

7. Solaris

Load Average and Lwps

NPROC USERNAME SWAP RSS MEMORY TIME CPU 320 oracle 23G 22G 69% 582:55:11 85% 47 root 148M 101M 0.3% 99:29:40 0.3% 53 rafmsdb 38M 60M 0.2% 0:46:17 0.1% 1 smmsp 1296K 5440K 0.0% 0:00:08 0.0% 7 daemon ... (2 Replies)
Discussion started by: snjksh
2 Replies

8. UNIX for Dummies Questions & Answers

Load average spikes once an hour

Hi, I am getting a high load average, around 7, once an hour. It last for about 4 minutes and makes things fairly unusable for this time. How do I find out what is using this. Looking at top the only thing running at the time is md5sum. I have looked at the crontab and there is nothing... (10 Replies)
Discussion started by: sm9ai
10 Replies

9. UNIX for Dummies Questions & Answers

Help with load average?

how load average is calculated and what exactly is it difference between cpu% and load average (9 Replies)
Discussion started by: robo
9 Replies

10. Programming

ESP32 (ESP-WROOM-32) as an MQTT Client Subscribed to Linux Server Load Average Messages

Here we go.... Preface: ..... so in a galaxy far, far, far away from commercial, data sharing corporations..... For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages.... (6 Replies)
Discussion started by: Neo
6 Replies
XTERMCONTROL(1) 						   User Commands						   XTERMCONTROL(1)

NAME
xtermcontrol - dynamic control of XFree86 xterm properties. SYNOPSIS
xtermcontrol [OPTIONS]... DESCRIPTION
xtermcontrol makes it easy to change colors, title, font and geometry of a running XFree86 xterm(1), as well as to report the current set- tings of the aforementioned properties. Window manipulations de-/iconify, raise/lower, maximize/restore and reset are also supported. To complete the feature set; xtermcontrol lets advanced users issue any xterm control sequence of their choosing. OPTIONS
--fg=COLOR Set foreground color (see also COLOR NAMES). --bg=COLOR Set background color. --colorN=COLOR Set N'th [0-15] color. --highlight=COLOR Set highlight color. --cursor=COLOR Set cursor color. --mouse-fg=COLOR Set mouse pointer foreground color. --mouse-bg=COLOR Set mouse pointer background color. --font=FONT Set font name (see also FONT NAMES). Alternatively it is possible to specify a fontmenu index as '#[0-6]' or navigate the fontmenu by relative sizes as '#+N' or '#-N', where N is an optional integer. --title=STRING Set window title. Note that mechanisms like the bash(1) PROMPT_COMMAND may overwrite the title. --geometry=WIDTHxHEIGHT+XOFF+YOFF Set size and/or position. Through its control sequences the xterm only recognize positive XOFF and YOFF offsets, which are pixels relative to the upper left hand corner of the display. xtermcontrol is therefore unable to handle negative offsets as described in the X(7x) GEOMETRY SPECIFICATIONS and therefore truncates negative values to zero. --get-fg Report foreground color. --get-bg Report background color. --get-colorN Report N'th [0-15] color. --get-highlight Report highlight color. --get-cursor Report cursor color. --get-mouse-fg Report mouse pointer foreground color. --get-mouse-bg Report mouse pointer background color. --get-font Report font. --get-title Report window title. --get-geometry Report size and position. The size of the text area is reported in characters and the position is reported in pixels relative to the upper left hand corner of the display. --maximize Maximize window. --restore Restore maximized window. --iconify Iconify window. --de-iconify De-iconify window. --raise Raise window. --lower Lower window. --reset Full reset. --raw=CTLSEQS Issue raw control sequence (see also XTERM CONTROL SEQUENCES). --file=FILE Force xtermcontrol to read configurations (see also CONFIGURATION) from FILE instead of the standard personal initialization file ~/.xtermcontrol. --force, -f Skip TERM environment variable check. --verbose, -v Print verbose reports. --help, -h Print help message and exit. --version Print the version number and exit. CONFIGURATION
xtermcontrol reads a default, ~/.xtermcontrol, or a user specified configuration file on startup. Each line in the file is either a com- ment or contains an attribute. Attributes consist of a keyword and an associated value: keyword = value # comment The valid keyword/value combinations are: foreground="COLOR" background="COLOR" highlight="COLOR" cursor="COLOR" mouse-foreground="COLOR" mouse-background="COLOR" geometry="WIDTHxHEIGHT+XOFF+YOFF" font="FONT" color0="COLOR" color1="COLOR" color2="COLOR" color3="COLOR" color4="COLOR" color5="COLOR" color6="COLOR" color7="COLOR" color8="COLOR" color9="COLOR" color10="COLOR" color11="COLOR" color12="COLOR" color13="COLOR" color14="COLOR" color15="COLOR" Whitespace is ignored in attributes unless within a quoted value. The character '#' is taken to begin a comment. Each '#' and all remaining characters on that line is ignored. FONT NAMES
xtermcontrol accepts any X(7x) FONT NAMES. Font names like '-adobe-courier-medium-r-normal--10-100-75-75-m-60-iso8859-1' are very cumber- some to write, so it is convenient to make use of aliases, e.g. 'fixed' or '8x13', if present in fonts.alias files of the font directo- ries. COLOR NAMES
xtermcontrol accepts any X(7x) COLOR NAMES. Basically this means that colors are specified by name or rgb value, e.g. 'blue', 'rgb:0000/0000/FFFF' or '#00F'. Colors are typically reported by the xterm in a device-dependent numerical form, e.g. 'rgb:0000/0000/FFFF'. Note that old syntax rgb values should always be quoted to avoid '#' being interpreted as the beginning of a comment by the shell (see also FILES). XTERM CONTROL SEQUENCES
The secret behind xtermcontrol is xterm control sequences. All the possible (there are a plethora of them) control sequences are documented in ctlseqs.txt, found in the xterm(1) distribution (see also FILES). TROUBLESHOOTING
If read/write permissions on the tty's are changed so that special group membership is required to be able to write to the pseudo terminal, the easiest workaround is to install xtermcontrol setuid root. Xterm(1) has three resources, allowWindowOps, allowTitleOps, and allowFontOps, that enables or disables special operations which xtermcon- trol relies on. If any of these resources are set (or defaults) to 'false' xtermcontrol may hang. The resources corresponds to xtermcon- trol options as: allowWindowOps: --raise --lower --restore --maximize --iconify --de-iconify --get-title --geometry --get-geometry allowTitleOps: --title allowFontOps: --font --get-font All three resources can usually be enabled for the current xterm session via a menu; ctrl+rightclick and look for menu item names like 'Allow Window Ops'. To set these resource values persistently you can add the following to either your local ~/.Xdefaults file, or to a system-wide resource file like /etc/X11/app-defaults/XTerm: *VT100.allowWindowOps: true *VT100.allowTitleOps: true *VT100.allowFontOps: true FILES
<XRoot>/X11/rgb.txt Default rgb color name file location. ctlseqs.txt Xterm control sequences documentation. Distributed with xterm from http://dickey.his.com/xterm/ SEE ALSO
xterm(1), X(7x) COPYRIGHT
Copyright (C) 2002-2009 Jess Thrysoee <jess@thrysoee.dk> xtermcontrol 2.10 October 17, 2009 XTERMCONTROL(1)
All times are GMT -4. The time now is 07:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy