On Mon, Jul 30, 2001 at 09:28:06AM -0700, John Baldwin wrote:
>
> 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.
There's no disk activity during this period. I can hear my disks when
they do work, and the machine is totally silent until it unwedges and
the disk I/O resumes.
Kris
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