On 30-Jul-01 Kris Kennaway wrote:
> Hi all,
>
> For the past 2 or 3 weeks my -current system has been experiencing
> temporary lockups, usually under disk load. The entire system will
> hang for around 20-30 seconds, during which time absolutely no
> network/IO/keyboard/mouse activity is accepted. Usually, after 20-30
> seconds the system will unwedge and activity will resume, but
> sometimes it hangs forever. There are no console messages logged by
> this event. I cannot break into DDB until after system activity
> resumes normally.
>
> My system is a PPro 233 using IDE drives. Has anyone else seen
> something like this?
I see this on my laptop sometimes, always accompanied by heavy disk I/O
during the entire interval. Since disk interrupts are higher priority than TTY
interrupts right now (no disk drivers use the PI_DISKLOW priority, partially
because there is no mechanism for them to do so right now) if a continual
stream of disk interrupts keeps the disk driver ithread busy, we will starve
TTY ithreads such as the one for keyboard and mouse.
> Kris
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