On Mon, 30 Mar 2020, nathan wrote:
Aha! I was hoping you'd chime in.
That is interesting!!I'd have been inclined to: - crack off a dtrace fbt
profile run looking at what was on cpu most of the time, and what the
most common stacks were
dtrace wasn't really an option because the host was running so slow it
took a number of minutes just to fire off a one-liner.
- grab a crash dump so you can poke around later...
Possibly should have done this, but given a clean shutdown was an option I
wasn't overly tempted to kick it in the nuts.
- check out the cpu power states (using powertop or similar)
Hey, learn something new every day, I didn't know the powertop was a thing
on Solaris. Very cool. I'll certainly look if it recurs.
In this case, I looked at the DRAC for power consumption and it was
burning power at the peak this host can consume, so I'd lean towards it
not entering a low power state.
If you were stuck in the lowest c-state, all the things you described
could wel happen, but I have never seen thay happen...
It would fit with the overall yawning slowdown to an extent, but this host
has a pretty crappy low-end Xeon E5-2307 (!) which I'm waiting on a
replacement for so there's not much room for it to sink down.
If it was the early-90s, I'd be looking to see if somebody turned the
"turbo" button off.
Id also be looking closely at something having clamped the arc. I have
seen arc_no_grow stuck as 1 in the past, and once in that state, the arc
shrinks to mearly nothing, causing much pain. mdb -k and then a ::arc
for some arc details and perhaps a ::arc_no_grow::print -tNothing much
else comes immediately to mind...
I didn't check the arc stats in detail but I did check ::memstat which
showed 37GB of 48GB consumed by ZFS which I assume is mostly ARC.
Cheers!Nathan.
Cheers!
--
Andre van Eyssen. Phone: +61 417 211 788
mail: [email protected] http://andre.purplecow.org
About & Contact: http://www.purplecow.org/andre.html
_______________________________________________
msosug mailing list
[email protected]
http://mexico.purplecow.org/m/listinfo/msosug
Delivered for: [email protected]
