The performance tag has no wiki summary.
4
votes
1answer
68 views
Timescales of any task in linux kernel?
I am studying how Linux kernel works and getting interested in the timescale of anything that happens in the kernel.
Of course I know it depends on the HW, but would like to get an example.
For ...
2
votes
0answers
219 views
Local disc copy at 10MB/s! What could be the problem?
I am running a Debian 6.0.6 (before you ask). I have a regular desktop computer, nothing fancy... but when I copy a file using nautilus I am getting 10MB/s copy speed and the system is completely ...
2
votes
0answers
389 views
Send print job to printer immediately without queueing, aka increase print performance
I have a ruby/rails web application, one action of which sends PDF files that have been generated by the app to a Xerox 4127 printer on the network. This is accomplished via shelling out and running ...
2
votes
0answers
320 views
“Remote function call interrupts” (CAL in /proc interrupts). What is it?
I'm running a test program which generates a large number of threads and asynchronous I/O. I'm seeing very high counts of these interrupts in /proc/interrupts, the program cannot scale beyond a ...
2
votes
0answers
170 views
Perform test of aes-ni and aes module in linux kernel
Since both aes-ni and aes module are available in linux kernel , how can I give it a performance test , to decide which one's faster ?
2
votes
0answers
250 views
Software raid checksumming slow
On my new 24 disk array I get 900 MB/s of raw read or write using dd to all the disks.
When I set the disks up as a 24 disk RAID6 I get 400 MB/s write and 600 MB/s read. It seems to be due to ...
2
votes
0answers
381 views
GNU/Linux, IO performance problems
I have some problems with my system performance. As I was adviced here, I used sar:
$sar -u 5
and found out that the problems are caused by a low HDD performance, as I supposed (high %iowait).
...
2
votes
0answers
684 views
Audio/video out of sync when playing MP4s in mplayer
When I try to play MP4 files in mplayer, after a few seconds I get the "Your system is too SLOW to play this!" warning and the video starts lagging behind the audio. It only happens with MP4s, and ...
1
vote
0answers
31 views
Why does my CMS run extremely slow in my workstation (Ubuntu)
For over a year I have been struggling with the response speed on my Drupal v7.2x CMS install. Let me explain. I'm running Drupal 7.2x on an Ubuntu 12.10 (upgrade to 13.xx pending) for the purpose of ...
1
vote
0answers
172 views
Connected external HDD slows down system
I need to connect large external hard disks (with many many files) to a system running Ubuntu. I have no idea how the Linux kernel is treating the inodes for the external drives, but attaching huge ...
0
votes
0answers
23 views
How can I figure out the reason of the lagging of Cinnamon?
So I am using Mint 15 with Cinnamon on my Dell XPS L502x (Sandy Bridge i7 + 8G + GTX540M + 300G SSD). I am using Numix theme and a custom font. I installed Bumblebee, but I am not using nVidia card in ...
0
votes
0answers
51 views
Troubleshooting Linux performance using KSAR utility
How can I go about troubleshooting Linux performance using the KSAR utility? I already have the data from sar** (sar01, sar02, etc.), but don't have any pointers as to what data relates to what?
I am ...
0
votes
0answers
90 views
X high CPU when using Java applications
Only recently, my Freemind program has become extremely sluggish and unresponsive (big lag) when moving my mind map around. I use Arch Linux with xfce4. Freemind is made with Java. If I move the mind ...
0
votes
0answers
197 views
NFS server optimization for maximum performance
I'm looking for maximum of performance for a NFS mount.
I'm on local network, it could be completly unsecure, the performance is the most important in my case.
What I already found :
In /etc/export ...
0
votes
0answers
161 views
write file to NFS speed issue
I have a big data file need to write to NFS directory which is mapped under a Windows system. I had 2 different approaches to achieve this.
I wrote (using the “save as” command) from the app directly ...
