Date: Thu, 8 Sep 2005 18:58:08 +0000 (GMT) From: wpaul@FreeBSD.ORG (Bill Paul) To: eta@lclark.edu (Eric Anholt) Cc: truckman@freebsd.org, freebsd-current@freebsd.org, kabaev@gmail.com Subject: Re: Odd performance problem (hitching) Message-ID: <20050908185808.D4DF416A420@hub.freebsd.org> In-Reply-To: <1126200330.11226.1.camel@leguin> from Eric Anholt at "Sep 8, 2005 10:25:30 am"
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> > >
> > >>That could be an important clue. Maybe one of the X apps that you are
> > >>running, like your mail reader, browser, or system status monitor. Try
> > >>running X with one of the lightweight window managers and just an xterm
> > >>or two.
> > >>
> > >>The 10 second interval doesn't make it sound like the problem is any of
> > >>the built in kernel tasks. It's more consistent with something that
> > >>runs every 10 seconds in userland that monopolizes some kernel resource
> > >>whenever it runs.
> > >
> > >
> > > Possibly, but I would expect to see some evidence in top of this.
> > >
> > > Also, during the 'lag' X drops or doubles up keypresses - it would suprise me
> > > to find that a userland app could make X do that very easily.
> > >
> > > I will try your suggestion though.
> >
> > I had a similar problem with XFCE4's battery/temp monitor applet. I
> > think my freeze was about every 6-10seconds.
>
> I've also had a problem with gnome's battery monitor producing long
> "hitches" every several seconds.
*sigh*
The problem is the ACPI thermal monitor thread. Once every 10 seconds,
it queries the thermal state of the system, and reading this state
seems to chew up a lot of cycles with interrupts blocked.
You can shut it up by editing loader.conf and adding:
debug.acpi.disable="thermal"
But the correct thing to do is fix the code that access ACPI
resources/registers/whatever so that it doesn't block for so
long. I'm really very annoyed that nobody has bothered to
address this yet.
-Bill
--
=============================================================================
-Bill Paul (510) 749-2329 | Senior Engineer, Master of Unix-Fu
wpaul@windriver.com | Wind River Systems
=============================================================================
<adamw> you're just BEGGING to face the moose
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