The performance tag has no wiki summary.
6
votes
5answers
330 views
Processor usage increases with 4GB RAM installed
I have an Intel Atom D2700 (Synology NAS DS412+) with 4GB RAM running kernel 3.2.30 x86_64. This unit has a single DIMM slot.
One thing I, and other's have found, is that when adding a 4GB DIMM ...
4
votes
2answers
247 views
Replace require statements by autoload in .emacs file to improve performance
According to these posts:
How can I make emacs start-up faster
a-nickels-worth.blogspot.de/effective emacs
one can somehow replace require and load statements in the .emacs file to speed up the ...
2
votes
2answers
578 views
slow media - disk cache tuning?
Is there any way to make the system more consistent when using LUKS? (or slow storage in general) as it is everything is snappy until the write buffer is full, then everything grinds to a halt as the ...
2
votes
1answer
406 views
Linux disk I/O performance issue — what config options to look at?
We discovered an I/O related performance problem when using the default SLES11 SP2 kernel. Our same application on the same hardware had no issue with (the admittedly ancient SLES9 SP3).
We had a ...
2
votes
1answer
369 views
What could cause a NAS mount to respond slowly?
I've a directory on a NAS mount (from NetApp), that contains ~6300 image files, total size of this directory is ~ 300 MB. I get two different performances of time ls:
First time (or after waiting 5-7 ...
0
votes
1answer
31 views
udevadm slow boot
After I upgraded from Slackware 13.70 to 14.0, when the machine is booting, it takes it 15 seconds to execute this line:
/sbin/udevadm trigger --action=add
I understand, that it tries to detect ...
3
votes
0answers
53 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
161 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
294 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
237 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
222 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
576 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
147 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 ...
1
vote
0answers
144 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 ?
1
vote
0answers
348 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).
...
0
votes
0answers
113 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
134 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 ...
