Disk throughput problem (DV capture).

destroyedlolo

Hello,

I'm facing some problems to capture DV videos using Kino : when data have to be writen to disk, the capture hangs fews seconds, the CPU usage fall from about 100% to 20% and the frames corresponding to this periodes are lost.

My configuration :

venerable Athlon 1.1Ghz
1.5 Go memory, obviously not swaping
system on an SCSI disk
capture on an IDE (PATA) disk, read performances : 50 MB (I duno the write performances as Disk utils needs an empty disk).

Under Gentoo :

Kino 1.3.4
kernel 3.0.6
LXTE/openbox

Under Ubuntu :

Kino 1.3.3
Kernel 2.6.31-23
Gnome 2

I think it's a problem of configuration regarding disk access as I don't have the problem when booting on Ubuntu.
What I can say is writing internal is longer on Gentoo but time to write is longer as well (I think it's because more caches are used under Gentoo).

Any tip ?

Thanks

Laurent

John R. Graham · Posted: Sat Nov 19, 2011 12:08 am Post subject:

What filesystem?

- John
_________________
I can confirm that I have received between 0 and 499 National Security Letters.

destroyedlolo · Posted: Sat Nov 19, 2011 12:22 am Post subject:

Ext4 (formated by Ubuntu's installer).

destroyedlolo · Posted: Tue Nov 22, 2011 10:07 am Post subject:

Nobody has a tip ? It's very anoying

Bye

Laurent

destroyedlolo · Posted: Tue Dec 13, 2011 11:15 am Post subject:

I found this interesting link, especially the part "Tuning Recommendations for write-heavy operations".

can I change the proposed settings on the fly and how ?
can I set them only for 1 disk (I don't think so, but who knows ...).

destroyedlolo · Posted: Wed Jan 25, 2012 12:03 am Post subject:

Well well well, no response good response as the French proverb says.

I did some tests on my own. And it seems :