On Sat, Feb 12, 2011 19:03:56 PM +0100, Marco Fioretti (mfioretti(a)nexaima.net) wrote:
On Sat, Feb 12, 2011 12:55:16 PM -0500, Lamar Owen (lowen(a)pari.edu)
wrote:
> On Saturday, February 12, 2011 12:19:33 pm M. Fioretti wrote:
> > besides hard drive and DVD burner there are only Logitech webcam,
> > wheelmouse and earphone microphone, but everything is plugged in
> > the back which is not really accessible without moving
> > furniture. I'll do that if needed, but isn't a way to check for
> > those interrupts from the prompt?
>
> Let's see if iowaits are you issue. Install the sysstat package
> (yum install sysstat) and run: iostat -x 1
here it is, thanks for the tip. When it isn't zero, the await column
gives anything from 27.36 to 35.78 (last line) to 5 (I have already
posted top output in a comment to the web page):
[root@polaris ~]# iostat -x 1 | egrep -i 'device|sda'
Sorry, of course that's only the part of the story about sda. here is one complete run
of iostat:
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz
await svctm %util
sda 0.00 5.00 0.00 5.00 0.00 64.00 12.80 0.03
6.00 6.00 3.00
dm-0 0.00 0.00 0.00 8.00 0.00 64.00 8.00 0.04
4.38 3.75 3.00
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00
other runs show all null values for dm-0 / dm-1, or values similar to these
Marco