| 1 |
On Tuesday, April 29, 2014 01:47:08 AM Peter Humphrey wrote: |
| 2 |
> On Monday 28 Apr 2014 13:32:05 I wrote: |
| 3 |
> > On Thursday 24 Apr 2014 13:57:19 I wrote: |
| 4 |
> > > So far I've done these things: |
| 5 |
> > > |
| 6 |
> > > 1. Wiped the whole system and restored from backup (heavy overkill, but |
| 7 |
> > > I |
| 8 |
> > > wanted everything to be in the same, consistent state). |
| 9 |
> > > 2. Run bad-blocks tests on all partitions (though all but / and /boot |
| 10 |
> > > are |
| 11 |
> > > in logical volumes - I don't know to what extent that will have affected |
| 12 |
> > > the results). |
| 13 |
> > |
| 14 |
> > --->8 |
| 15 |
> > |
| 16 |
> > Looking at bad-blocks again, I see from gkrellm that 'mkfs.ext4 -cc -L |
| 17 |
> > Atom |
| 18 |
> > /dev/vg7/atom' writes the test patterns to both the underlying physical |
| 19 |
> > disks, but it only reads back from one of them |
| 20 |
> |
| 21 |
> ... so it isn't much use on a virtual disk. |
| 22 |
|
| 23 |
I thought the man-page for badblocks (it's a seperate utility) actually says |
| 24 |
it should be run on the physical disks? |
| 25 |
|
| 26 |
> Well, that was a long weekend. |
| 27 |
> |
| 28 |
> The symptoms grew stranger and stranger, until I eventually discovered a |
| 29 |
> problem with IRQ 16. |
| 30 |
> |
| 31 |
> /proc/interrupts includes this line: |
| 32 |
> 16: 0 302525 0 0 IO-APIC-fasteoi ehci_hcd:usb1, nouveau |
| 33 |
> |
| 34 |
> The source file /usr/src/linux/kernel/irq/spurious.c says: |
| 35 |
> |
| 36 |
> ...and suggests booting with irqpoll. |
| 37 |
> |
| 38 |
> So I added irqpoll to the kernel command line. It seemed to make no |
| 39 |
> difference at the time, but I haven't had any recurrence in the last two |
| 40 |
> days. I see though that, according to gkrellm, I have core temps of 52 - |
| 41 |
> 56C and the graphics card shows 59C. That shouldn't be hot enough to start |
| 42 |
> raising spurious interrupts: the nVidia web site says to expect around 105C |
| 43 |
> as a limit. Perhaps I should find a different slot for the Quadro FX580 |
| 44 |
> card, to separate it from the usb interface. |
| 45 |
|
| 46 |
Always a good idea, if possible. |
| 47 |
USB and Video are both heavily used items. |
| 48 |
|
| 49 |
> So, many hours and much rebuilding later, I've installed a new chroot for |
| 50 |
> the Atom and it seems to be working as expected. Actually, I reinstalled |
| 51 |
> the entire system to be safe, including re-creating the physical and |
| 52 |
> logical volumes on the two SATA disks. |
| 53 |
> |
| 54 |
> The question still remaining is what caused millions of spurious interrupts |
| 55 |
> over a period of a week or so and then subsided. This is an Asus P7P55D |
| 56 |
> motherboard (http://www.asus.com/Motherboards/P7P55D/). |
| 57 |
|
| 58 |
USB-mouse, keyboard,harddrive,flash-stick,.... ? |
| 59 |
Eg. anything plugged into USB can cause interrupts. |
| 60 |
|
| 61 |
Also, some mainboards have additional items pre-connected to the USB-bus. |
| 62 |
|
| 63 |
-- |
| 64 |
Joost |
Archives