[nSLUG] USB stick for backup okay?
mspencer at tallships.ca
Mon Apr 9 01:36:16 ADT 2018
> On Tue, 3 Apr 2018, Mike Spencer wrote:
>> Digression: Still turning up problems with the IBM P4 box that's my
>> main computer. Shipped with IDE drive but has 2 plugs on mobo for
>> SATA drives. After the IDE HD failure in 2016, replacement drive
>> was SATA. Appeared to work fine. But then found that large writes
>> to HD (say, copy 1G from USB to HD) bogged the CPU down. Also,
>> playing a DVD video with mplayer causes the clock to fall behind
>> ca. 6 sec. per minute of video.
> An easy thing to check is whether you have multiple devices sharing
> an interrupt, which is nominally OK but slow interrupt handlers can
> lead to it not being OK. Run
> watch -n .1 cat /proc/interrupts
> in one terminal window then perform a slow operation in another and
> see if most of the interrupts are pegging one IRQ. A quick fix might
> be to switch which socket the SATA drive is plugged in to, or move
> USB devices around.
Hah. Thanks for that. watch(1) is a new one for me.
I've been distracted by other things but I did try it while playing a
DVD. Didn't see anything that didn't make sense. But whatever that
DVD/clock-slow thing is, it's probably very different from the
Int 0, labeled "timer" ticks all the time, apparently 100 times per
second. (With -n 1, it updated by 101 every screen update.) I don't
actually know what that is. Maybe a hack similar to watch(1) would
reveal that when a DVD is playing, that rate changes? Unsure what
such an observation would explain, though.
Michael Spencer Nova Scotia, Canada .~.
mspencer at tallships.ca /( )\
More information about the nSLUG