Pieter de Boer wrote:
Hi there,
what kind of disk I/O is going on. If actual I/O is very little, then
something weird is going on with regards to the number of interrupts
being seen on IRQ 23. mav@ might have some ideas, otherwise I'd
recommend rebooting the machine and seeing if the number drops. If so,
it may be that the OS has some sort of bug where a disk timing out or
falling off the bus causes interrupt problems. (It's too bad you don't
have AHCI on this system. It handles stuff like this much more
elegantly...)
Well, due to a UFS snapshot panic the box was rebooted, and now I only
see around 1500 interrupts per second, while syncing the mirror.
I seen high interrupts on 7.x systems after pulling out/in one drive in
gmirror [1] even if it was successfully disconnected by gmirror remove +
atacontrol detach and reconnected by atacontrol attach + gmirror insert.
It was not 100% reproducible, but it seems the bug is still there in 8.x.
[1]
http://lists.freebsd.org/pipermail/freebsd-stable/2008-October/046003.html
Miroslav Lachman
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