Re: Interrupt latency problems

In message: <1052684139.4921.3.camel_at_cf.freebsd-services.com>
            Paul Richards <paul_at_freebsd-services.com> writes:
: On Sun, 2003-05-11 at 20:45, M. Warner Losh wrote:
: > In message: <22333.1052574519_at_critter.freebsd.dk>
: >             "Poul-Henning Kamp" <phk_at_phk.freebsd.dk> writes:
: > : In message <1052570246.27195.6.camel_at_cf.freebsd-services.com>, Paul Richards wr
: > : ites:
: > : >I'm having real problems with current with heavy disk activity.
: > : >
: > : >When working in X and updating ports which causes a lot of disk activity
: > : >I get *very* poor interactive responses. Keypresses can not appear for
: > : >seconds and mouse movement is very jerky and unresponsive.
: > : >
: > : >I'm wondering if something is holding locks a long time in interrupt
: > : >handlers and causing mouse/keyboard interrupts to be lost?
: > : 
: > : We have this lock called "Giant" which we're trying to get rid off...
: > 
: > Actually, this may be a problem in the acpi code.  I have at least one
: > battery that causes my system to 'freeze' for a while.  The mouse
: > interrupts aren't lost, per se, but just deferred too long.  That was
: > before the latest acpi upgrade, and I've not tried the offending
: > battery since then (I think that the zero length messages are related
: > to querrying the battery status, but haven't booted windows to find
: > out for sure).
: 
: Hmm, that an intersting line of thought. The symptoms sound similar,
: that interrupts aren't necessarily been missed, since I can type when
: things seem locked up then it all appears.
: 
: I get boatloads of these, they stream past continuously.
: 
: ACPI-0448: *** Error: AcpiEvGpeDispatch: No handler or method for
: GPE[0], disabling event
: 
: I have no idea what they mean though :-)
: 
: I wonder if that might have something to do with it, or if it's
: triggering a problem somewhere in the dmesg buffer that's causing locks
: to be held too long.

Is this a laptop?  I've only seen problems on the laptop.  I've seen
shorter hangs from heavy ata disk activity, but my only ata systems
are laptops and they don't have the high performance necssary to
trigger things.

Or it could just be giant.

Warner