Networking :: Network Usage Is Overloading CPU
May 23, 2009
recently my server become a little slow and lazy, so I started a small investigation what's going on and found out, that there is some problem with network.All processes which uses network are able to use 99% of CPU time when they got any requests. First time i thought it's only a bad configured Apache but after some research I found even FTP or SSH does it if they have to do something more (for example getting data to another server using rsync).So far I wasn't able to find a cause of this. No new software installed, only updated every few days. I have another server which have the same config, same software, same hardware and is updated in same days. But this one works without any problem. I think it's probably hardware (LAN) leaving me to it's creator. Is there some way how can I test if it's really LAN or just something bad happened to the system?
Also there is another issue - maximum speed dropped down to 20-30kB/s for both download or upload.It's Debian Lenny 2.6.22-6 if you need to know.
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May 24, 2010
How do I find out the network usage ie the total amount of data is transferred in or out of my computer (openSUSE 11.2 and gnome) and keep a track of the total network usage?
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Jul 8, 2011
I have two pcs connected through wifi in p2p mode...I would like to see the cpu usage of the network. Could anyone help me with tools I may use for seeing cpu usage in this network.
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Nov 13, 2009
I have installed oracle enterprise Linux in my desktop.It is the free download from Sergio's blog(in 6 CD)Now i need to work with the yum in oel5 for installing packages and also i need to install the necessary packages in my client another system both are in a network.
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Jul 13, 2010
A small "mom and pop" WISP would like to provide account usage information to customers.Basically, when a person connecting to the WISP's web site is a customer with an IP address from within the WISP's subnets, a link would appear on the web page where customers could read total bandwidth usage (daily, weekly, monthly, and yearly totals and averages) and public IP address. Information could include the top five bandwidth URLs visited; graphs or charts of usage; and usage during specific periods, such as business hours (8AM-5PM), evening hours (5PM-10PM), night (10PM-8AM), and weekends (10PM Friday-8AM Monday).
The WISP has installed cricket (http://cricket.sourceforge.net) and rrdtool (http://oss.oetiker.ch/rrdtool). The next trick is to grab and format the data for customers.I'm not looking for answers like "look at xyz package." Helpful responses will include a rudimentary outline to solve the problem. That is, "xyz package" might indeed be what the WISP needs, but some guidance how to use xyz is needed to move down the road.I have no experience with this type of thing. I appreciate responses from people who are experienced.
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Jul 13, 2010
I was wondering how do you slap a packet analyzer like Wireshark somewhere between all the computers in a house and the router, so you can tell what websites are being accessed? I mean websites, specifically. I'm not trying to monitor bittorrent, IRC or other things yet - I'll get to that later. I just want to break this insanely complex task into smaller bites for now.Also, since my ISP has bandwidth caps but does not have a means for consumers to monitor total network usage, I'd like to figure out how to use Wireshark to do that as well. This, I am assuming, is easier when wireshark is running on the pipeline going into the router.
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May 9, 2010
I have looked for and found several tools to show a system's total network usage. I have not, however, been able to find any that show this information in the context of individual processes. Do any such tools for linux exist?
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Apr 9, 2009
I have a network connection between 3 computers sharing the same net bandwidth with the same router (modem), I wanted to know how much every one of this network taking from the bandwidth, I want an easy program like switch-sniffer (see the pic) to scan the network and tell me how much every one taking from this network in real time.
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Jan 21, 2011
I have a home PC which connects through internet via a Zyxel ADSL router. I use Fedora 14 as my one and only operating system and sometimes I am seeing the LEDs of my modem blinking very fast which means that something is downloading. I want to know which application download what on my PC. Is there any tool in Fedora that can show which application uses my network?
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Dec 5, 2010
I'm running Ubuntu 10.04 and all was well on my home network until a household member decided to get a laptop and jump on my network. All he does is watch videos on ....., download crap from P2P sites, and maybe even watch p0rn. Is there something I can use to control this or maybe set my router to give him the minimum resources available? Also, I want to block him from downloading junk from P2P sites or places he might get a virus. I'm on a D-Link DGL 4500 Router.
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Sep 1, 2011
is there any way to monitor each application network bandwidth usage ?I've used gnome-system-monitor, but unfortunately it just show the total network activity
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Jun 23, 2009
I've run into a problem gathering usage for my xen virtual systems. With my old model I used to gather all network usage via my cisco devices using the the counters for each port. Each system had it's own port on the switch, and I tracked network usage accordingly. Now that I'm using xen for virtual systems, and multiple vm's share the same switch port, i'm not exactly sure what my best option is for tracking usage.
I thought I may be able to setup vlans on the switch, and bind each vm to a different vlan using vconfig... but it seems like there has to be a better solution than that.
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Jan 5, 2010
My wireless usb network adapter is constantly using ~100bytes/s even when there is nothing I can think of that needs to talk to the internet. Is there a way to find out what programs are using the internet?
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Dec 8, 2010
I have a third party program (tightvnc) which I want to monitor and detect if it loses a connection with a client. I don't care if the client has the program open but isn't doing anything with it, I only want to know if the actual TCP connection is lost.
Since TCP takes forever to die on it's own I was thinking the best way to detect if a connection is lost is by bandwidth the bandwidth on the tcp port allocated to the VNC connection. Are there any tools built in to redhat (RHEL 5.2) which I could use to do this? Since I don't have full control of the operating system I would prefer to use built in tools rather then trying to get a new tool installed.
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Feb 17, 2010
application to monitor application wise network usage?
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Apr 10, 2010
I have mysql server ( OS:FreeBSD) is have 8 cores cpus and 8GB RAM.
Sometime, Box's top is not showing the cpu utilization. Output looks as follows
last pid: 44258; load averages: 0.38, 0.42, 0.23 up 0+16:31:11 07:15:14
169 processes: 14 running, 136 sleeping, 19 waiting
CPU: % user, % nice, % system, % interrupt, % idle
[Code]....
Moreover, WCPU is >98%. But not much processes are running on that server.
get the info about cpu or box ?
1. How to proove that box is having CPU issue
2. Is it related to memory ?
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Jun 23, 2011
Iam handling mail server in redhat.MTA using is qmail.since last 1 month it get overload and get hang...since in morning its time for user to loging into mail through web interface.though suddenly login in to mail it get overload and server got hang.we need to restart the server...did not get time to kill https also some time MP port work to save us...still didnot get command to overcome the over load in server...
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May 5, 2011
After upgrading to 11.04 I find that if I launch ubuntuone my machine immediately slows to a crawl and there is intense hard drive activity.This persists for hours. Only solution so far is to close ubuntuone and remove it from list of startup applications. I have made no changes to the files marked for ubuntuone syncing, and everything worked fine in 10.10.
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Aug 5, 2009
I am trying to figure out why the remote X performance of our RedHat 5.3 system is so bad. We have tried using X (Gnome session) from several different X Servers (Windows Xceed, Windows XWinPro, Linux Xnest - both Fedora 11 and Centos 5.3 and Mac OS Xnest) and the system is barely usable. I have monitored the network traffic on the RHEL system and it goes up to 6MB/s at some points, which seems a bit too high for X net traffic?I have disabled ipv6 and any ip_tables modules and that has helped a bit, but it's still not very good.I suspected the network hardware and driver, but I cannot see how that would cause network traffic problems.I wonder if there are any X Server network settings I might check, or whether trying XFCE would be a better option over Gnome. If so, do I have get the xfce group from a CentOS Repo, or is there something better suited to RHEL?
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Jun 7, 2010
I just wanted to use a network bandwidth usage monitoring application. Scenario: I am using an EV-DO based USB broadband modem with a limited GB plan. For additional data usage they charge per MB. Currently I use either wvdial (mostly) or pon to start the connection. So if there is any network monitoring application which could log time used and data used for the session, it would be great. Actually debian has too many different network monitoring applications, But I am not sure which one suits well for this purpose.
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May 27, 2010
is there a command that shows current network usage, similar to the way htop shows memory and processor usage?
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Jun 15, 2011
I'm currently running my own postfix server which is the MX for my domain. This is hosted in my house at the moment on the end of an ADSL line with a static IP. However, I'm trying to go totally mobile so I can kill the ADSL and the line rental and switch to 3G. Does anyone know a solution which allows me to accept (or ask for delivery) of SMTP when temporarily connected and queues it externally? Sort of like a hosted mail queue which pumps SMTP onto my laptop only when I ask it to.
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Feb 18, 2010
We are switching from an uncapped 512kb line to a 4MB line at the office... One catch though. The 4MB line will only be linked to a 30GB account, without the option to top up. I therefore have been asked to put something in place to regulate what the staff download at work. Basically block movie, music and torrent downloads should be sufficient, but they would also like to have a list of where staff have been in case of abuse. I have tried OpenDNS in the past, but the guys took great delight in getting around this, and did it within minutes... I can't enter a proxy setting into their browsers, because they all have local admin rights on their Windows boxes and will just disable that. How do I do this on a server level, so that they can't get around this?
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Sep 6, 2010
I need to monitor network performance/usage based on protocols.
About snort now, is perfstat.c is replaced with some thing else?
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Apr 30, 2010
I setup a server with vmware esxi 4. I installed opensuse 11.2 and I have successfully setup an internet gateway and I manually configured (static) my client IP. My question is, is there any software or commands that I could use to manage the bandwidth usage for each client? eg. only 5Mbps for 192.168.1.5, 10Mbps for 192.168.1.10, etc
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Mar 15, 2010
I was trying to get the status of memory usage and disk usage using sigar in windows and ubuntu. done this in windows by just copying the sigar library into jdk library. But i was unable to do so in ubuntu. I've copied the library to java-6-sun library but still can't run the program.
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Dec 10, 2010
I'm running into a problem where my system is running out of disk space on the root partition, but I can't figure out where the runaway usage is. I've had a stable system for a couple of years now, and it just ran out of space. I cleaned some files up to get the system workable again, but can't find the big usage area, and I'm getting conflicting results.For example, when I do a df it says I'm using 44GB out of 58 GB:
Code:
[root@Zion ~]# df -h
Filesystem Size Used Avail Use% Mounted on
[code]....
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Nov 15, 2010
Is there any way to monitor one process' CPU usage and RAM usage over time on Linux? I am trying to change to a cheaper VPS and need to work out what level of CPU and RAM I need!
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Apr 16, 2011
I'm having a bit of an issue using overloaded operators in an already overloaded operator. In my following code, I have overloaded the && operator to compare two Course objects. The operator in turn goes to a function which calls other overloaded operators to compare private object variables of that object to compare them.
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Sep 14, 2010
I need to get usage's bytes of a specific (src/dst)IP adress;can i use this
#iptables -L -n -v -x
with the other options that get only byte of the specific IP address?
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