On Saturday, February 12, 2011 12:27:55 pm Rick Sewill wrote: > On Saturday, February 12, 2011 12:09:34 pm M. Fioretti wrote: > > On Sat, Feb 12, 2011 19:03:56 PM +0100, Marco Fioretti > > (mfioretti@xxxxxxxxxxx) wrote: > > > On Sat, Feb 12, 2011 12:55:16 PM -0500, Lamar Owen (lowen@xxxxxxxx) 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 > > Could you show the output of iostat -x 1, > not iostat -x 1 | egrep -i 'device|sda' > please? > > On my system, when I do > iostat -x 1 > I get "avg-cpu" besides drive information. > avg-cpu: %user %nice %system %iowait %steal %idle > 5.05 0.00 4.04 0.00 0.00 90.91 > > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz > avgqu-sz await svctm %util > sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 > > It might help to see the "avg-cpu". > If we are lucky, either the %user or %system or ... will show high cpu > usage. Another question please...if it's spurious interrupts, I found the device file, /proc/interrupts, which has a row for Spurious interrupts. We haven't demonstrated the problem is interrupt related. Can we try to isolate or rule out this as a problem please? Could you show us the output of twice, the second time a few seconds after the first time so we can see if any interrupt number changes fast. more /proc/interrupts ... more /proc/interrupts Can people suggest any information/files in /proc which might help us? I assume there is a periodic hardware clock interrupt for your CPU. Can we find out this clock interrupt rate somewhere?
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