Ubuntu Networking :: Optimizing For Low Quality DSL?
Apr 28, 2011
I have a friend who is using Ubuntu 10.10 Netbook Edition on their netbook and well they love it. However, I notice that at times (if not all the time) their internet is ridiculously slow. Yes, it's a 1 Mbps download connection, but I still think it's a little slow and at times I can't even get it to load a website. I'm thinking if I adjusted the MTU within Ubuntu, it might improve, if even only slightly. I believe the router is set to 1490 or 1500, I haven't really looked yet.
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Jan 19, 2010
I am working on optimizing the iptables. I came across some way of optimizing the rules by removing the redundant rules and merging the rules . Is there any other way to increase the optimization of iptables ?The network that we applied the iptables is a simple LAN network. (College Network)
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Jan 27, 2010
I'm trying to setup QoS for my VoIP line on my debian router box. I have tested wondershaper and to me it doesn't seem to work at all, so I'm looking for a better solution. Ultimately I would like something in the lines of [URL] but I guess such nice things doesn't exist for linux. Currently I'm on an ADSL link switching to cable in a few months.
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Jan 10, 2010
What does the Quality, Signal Level and Noise Level actually mean? Which should I be looking for when looking for good APs?Is Quality the same as RXQ in airodump?
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Jun 30, 2010
So im pleased that my mobile broadband connection works but unfortunately the gnome/ubuntu way of displaying the connection strength is poor to say the least. Shown in this screenshot is my connection, 4 out of 4 bars.
BUT, does this mean i have a decent signal but only gprs? How do i tell if i have connected with 3G hspda gprs etc....?
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Aug 24, 2010
I have just bought a digital-to-analog converter, this one to be exact, along with an amplificator and two speakers. I'd like to get the most of my Ubuntu, a good sound (what player can I use ?) and to know wether I need to do some extra changes in the kernel (OSS / PulseAudio / ALSA ?) or not.
I wonder if my converter will be detected when i plug it in, and if any sound from my computer will be leaded to it automatically ? (I'll have the converter tomorrow). I believe its purpose is to replace the sound card, to provide a greater, pure sound. The converter is linked by USB by the way.
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Aug 20, 2010
In one of my interview, interviewer asked the following question on deep copy constructor:
When we are externally overloading the copy constructor is there any optimization strategies when we are using several copy constructors.
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Jul 23, 2011
I would like to ask how can I optimize apache2 load on my dedicated server. I am hosting Facebook applications on it, but most users will get a Timed Out message when they try to access it. I was tinkering with MaxClients directive in apache2 config, and it got better, but still it's not best. Programmers are trying their best to optimize the applications at their side, but I am afraid this is an server issue.
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Apr 12, 2011
I wrote a little Bash script which accepts two values -- sender address and recipient address -- and finds any instances of mail sent from sender to recipient in /var/log/maillog. The script works fine, but it seems to be very inefficient. I'm just wondering how I can optimize it.
Code:
Example:
Code:
Again, it seems to work fine, but the script greps through /var/log/maillog three times -- first to find the sender; second to see if it's also going to the desired recipient; finally to view all instances of the message ID in the logs. This seems redundant and inefficient.
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Jul 13, 2011
I'm trying to solve this problem, but always get Time limit exceeded. I've tried my best but still can't get under time limit. Could you please give me some hint about it?
Code:
#include <iostream>
#include <cmath>
[code]...
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Aug 13, 2010
I am running Ferdora 12 (constantine) 64 with Intel Xeon 3.2GHz processor + 12GB Ram. I am running this machine specifically for number chunching applications but it isnt running as fast as i thought it would! Are there any tips to optimizing the speed of processors in fedora?
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Jan 19, 2010
I recently purchased a Western Digital 1TB USB hard drive to use for general data storage. I had thought about repartitioning it into 8 - 10 individual drives (most Linux users will doubtless understand the arguments for and against this) and reformatting them with another filesystem, probably ext2.
The unit actually consists of two 500GB drives that are presented by the internal controller as a single 1TB drive, and are formatted with the old HPFS/NTFS filesystem, so I'm a bit cautious about the possibility of my original plan confusing the drive's controller. Does anyone have any experience with these large drives, any thoughts about repartitioning/reformatting, and relevant criteria for optimizing their use?
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Nov 21, 2010
Where can I find comprehensive information on optimizing Linux? I keep searching online but seem to get only to performance monitoring. I don't want to run a lighter version of Linux or upgrade my hardware! Just want to get my current distro and future ones I might install to run at its best.
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Jan 15, 2011
I tried to summarize the this as best as possible in the title. I am writing an initial value problem solver in the most general way possible. I start with an arbitrary number of initial values at arbitrary locations (inside a boundary.) The first part of my program creates a mesh/grid (I am not sure which is the correct nuance), with N points total, that contains all the initial values. My goal is to optimize the mesh such that the spacing is as uniform as possible. My solver seems to work half decently (it needs some more obscure debugging that is not relevant here.)
I am starting with one dimension. I intend to generalize the algorithm to an arbitrary number of dimensions once I get it working consistently. I am writing my code in fortran, but feel free to reply with pseudocode or the language of your choice.Allow me to elaborate with an example:Say I am working on a closed interval [1,10]
xmin=1
xmax=10
Say I have 3 initial points: xmin, 5 and xmax
num_ivc=3
known(num_ivc)=[xmin,5,xmax] //my arrays start at 1. Assume "known" starts sorted
I store my mesh/grid points in an array called coord. Say I want 10 points total in my mesh/grid.
N=10
coord(10)
Remember, all this is arbitrary--except the variable names of course. The algorithm should set coord to {1,2,3,4,5,6,7,8,9,10} Now for a less trivial example:
num_ivc=3
known(num_ivc)=[xmin,5.5,xmax
or just
num_ivc=1
known(num_ivc)=[5.5]
Now, would you have 5 evenly spaced points on the interval [1, 5.5] and 5 evenly spaced points on the interval (5.5, 10]? But there is more space between 1 and 5.5 than between 5.5 and 10. So would you have 6 points on [1, 5.5] followed by 4 on (5.5 to 10]. The key is to minimize the difference in spacing.I have been working on this for 2 days straight and I can assure you it is a lot trickier than it sounds. I have written code that
only works if N is large
only works if N is small
only works if it the known points are close together
[code]....
So as you can see, I have coded the gamut of almost-solutions. I cannot figure out a way to get it to perform equally well in all possible scenarios (that is, create the optimum spacing.)
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Oct 16, 2010
On my bare metal server, I get about 130MB/s read from a software RAID 10 array, but when reading the same file from a VM via NFS over the VirtIO interface,I only get about 40MB/s.
Furthermore, the process for the VM uses >180% CPU on the host, and ~40%, and the 5 min average is ~1.5 on the host and guest. I have dual E5620's so I'm disappointed that the transfer is so slow, as I was expecting at least 90MB/s.
I'm new to being a sysadmin, so if anyone has some tips I can use to increase the transfer rate, and possibility reduce the CPU load as well I'd appreciate it. I'm assuming that 130MB/s is the max speed of two 7.2k HDDs, but if there's any way I can squeeze any more out that would be great too.
System specs:
2x Intel Xeon E5620s @ 2.40Ghz
8GB of RAM @ 1066Mhz
4x 1TB Western Digital Black HDDs in RAID10
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Oct 11, 2010
I have a dual boot on a netbook with windows and fedora13. When I am on my fedora boot and I try to watch streaming video it comes through in waves or not at all. I do not have the same problems on the alternate boot. There are other performance comparisons where the windows boot runs smoother and faster. Is there any work I can do in order to optimise my fedora boot in this capacity?
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Apr 20, 2010
So I've come across several tips to optimize battery life on Linux. [URLs]. In addition to undervolting, I would like to underclock. Is there a way to control CPU speed outside of the BIOS via some software control in Linux... or some sort of boot manager? I would like to boot to linux using underclocked speeds and have Windows running full blast. Is there a way to run Linux completely in RAM? I have read that saves on power consumption from the hard drive.
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Feb 14, 2010
I have put my record collection onto disc (Ubuntu+Audacity+Rythmbox) I would now like to play the MP3 files through my Hi-Fi. Is there a "media player" unit that can connect to a MONITOR? Note I do NOT have a TV and it looks as though these using can only connect via TV. I presume a cheap laptop would do the job but would I get Hi Fi quality sound by connecting one?
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Jun 28, 2010
I'm a bit new in Ubuntu, but I am about to get a hang in it. I have previous use karmic koala and the version before that (cant remember the name for that) on my old computer and now I am using ubuntu 10.4 on my new computer. Ever since I installed Ubuntu for the first time, I noticed that the sound quality wasn't... the best. There isn't so much wrong with it, but like that this example. I played a FLAC file with some headphones (thru Ubuntu) and the sound quality sucked.. and then I played a mp3 file (with an ipod) and the sound quality was much much much better than the FLAC file.
I tired to play an HD movie over ....., where on Windows XP it sounds perfect, but with Ubuntu it kinda sux. The MP3 (Ipod / windows XP) is still better, than anything that is being played in Ubuntu. This is with almost every sound format I have tried. No matter if I play it with Rythmbox or vlc or some other player, the sound is wrong. I cant describe how it sounds.. but it is like it is going with a low frequency... or it is compress some how... Ever since I tried Ubuntu for the first time Ive noticed that something was wrong, but couldn't never really put my finger on it. I have dual-booted with windows XP and the sound in XP is really, really good compared to Ubuntu.
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Jul 24, 2010
I'm trying to get the best performance/quality on my my 10.04 box and i have a few questions regarding 'sync to vblank'. My first question : I see 'sync to vblank' in 3 different locations.
- In compiz display settings
- In NVidia XVideo settings
- In NVidia OpenGLX settings
What is the difference between the 3 ?
Second question : I used to have problems watching movies where the picture seemed to be cut in half ( i'm not a native english speaker so i don't know the technical term). After reading some forums, i enabled sync to vblank everywhere i saw it. That solved the movie problem. But maybe that was overkill ?
So i did some benchmarking and noticed the following :
When i disable 'sync to vblank' in compiz my compiz benchmark drops from 60 to 30. But then my movies look worse.When i disable 'sync to vblank' in NVidia OpenGlx my GlxGears framerate jumps from 300 to 36000.I didn't notice anything when changing vsync in the NVidia XVideo setting. System specs below.
Ubuntu 10.04 64b
Nvidia GT 230 1536MB
NVIDIA Driver Version : 195.36.24
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May 19, 2011
I have an 8Gb mkv file, which I tried to encode to avi using mencoder, it took more than 6hrs and when completed, the quality of the avi was pretty poor.Is there a way to increase the quality or is there a program that can encode mkv files? The mkv will not play on my system without stuttering badly.
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Jun 15, 2010
my girlfriend has a netbook(acer A0751h-1401) and always complains how slow it is on vista and how much it freezes up, so i put ubuntu netbook remix on it. The video qaulity is so slow i give up and install xubuntu thinking it will be better since it is for slower computers, wrong. So im thinking it is a video driver issue or something. it has the intel gma 500 in it but it is only allowed to use 8mb of memory for video and i cant change it in the bios. I mean it shouldnt have all the lag on xubntu that it does
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Sep 19, 2010
I am using ubuntu version Ubuntu 8.04 , it is observed that the video quality is poor as compared to windows os i am not sure it is driver problem or something different, below are detail of my system
CPU : 2.6 Mhz
RAM :1024 MB
board : Intel 845 chipset
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Sep 20, 2010
I am runnin Ubuntu 9.10- the Karmic Koala on acer aspire laptop. since everythin in this netbook is crap. so I hardly can see movies that so much going on in them( when so much happens, the screen freezer for a while therefore i miss the most interesting bits) I used kinda every players. the only one that works for me is mplayer since it does not require high spec it works good but it has its own costs. if I use mplayer then i have the porblem of the sound (eg i can hear stuff before it happening) I am now just wondering if there is a way to decrease the quality. I really dont care if i have great quality or not as long as i can c whats happening ( at least for this netbook anyway)
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Dec 9, 2010
I'm still new to Ubuntu and I'm trying to get the sound working. I have a Satellite X205-SLi1 and just installed Lucid. Everything is okay, except for the sound. My laptop has 5.1 harman/kardon speakers and I think just some of them are being used and the quality is bad. I'm not sure what to do...
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Jan 19, 2011
I've been using Windows (7) a little, and I just noticed that the mouse movement is simply infinite times better than Ubuntu's. On Windows I was able to actually "draw" things using the mouse, and it's amazingly comfortable. You actually feel on control of it. On Ubuntu I've tried to reduce the mouse polling rate to 2ms, and a number of different speed and acceleration combinations, but It seems impossible to achieve the same quality (or at least something acceptable after trying Windows).
Now that I'm used to Windows' mouse movement, I feel extremely uncomfortable and have difficult even to target links on webpages. Is there a way to increase the movement quality? My mouse is a Microsoft Basic Mouse. I'm attaching a file of a circle drawn with mouse on Windows and an attempt to reproduce it on Ubuntu.
Windows:
Ubuntu:
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Jul 9, 2011
I currently run a server. The web server (Abyss X1) runs on Linux, and the MTA server (MERCURY) runs in a virtualized Windows environment, within Linux.
I am soon going to be building a dedicated server, and at the moment it looks like it will be a Windows-based server, as I can't find MTA software for Linux with the feature I require.
I need MTA software that can show me network verbose output in real time, as such does MERCURY in the following screen shot: [url]
Does anyone know if such MTA software for Linux exist?
MERCURY does not work correctly under WINE, so the WINE method is not an option.
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Jul 21, 2011
I get very low sound quality when downloading pod casts. I tried the same file on a windows machine and there the sound was good.What can I do? Should I upgrade the sound card driver?
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Oct 30, 2010
With optimizing my webserver.
Hardware
- Intel Q8300 2.33 GHz
- 2GB RAM
- 100 Mbit
Code:
Ok this might get a bit messed up ... but basically..
When someone visits the site, the connection should be terminated in 30 sec and if he wishes to further browse reconnected.
How i can maximize output, the more users server can entertain the better. on peak times i get around 2000 visitors, so any tips on how to compensate the most..
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Jan 8, 2010
I downloaded an HD video from ....., but my computer is not powerful enough to play it. Is it possible to convert it to standard quality in Handbrake? If not, what video converter would be best?
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