On Sat, 5 Jan 2002, Kenneth Crudup wrote:
>
> *grumble*
>
> (I *swear* I'd tested with only a clean "weave" only before, but ....)
>
> So, I narrowed it down to the use of APM. If APM was enabled in the kernel,
> *no matter* what options were set in XFree86, I'd get clock slowdowns. So,
> I umounted /proc, and tried it again- no slowdown! I downloaded the code,
> looked at the linux-specific APM stuff, and even binary edited XFree86 so
> that it wouldn't try and open /proc/apm (and by extention, /dev/apm_bios) -
> but that didn't work either. So, although I *swear* I started X in a known
> minimal state when trying these tests before, I started looking at my
> default X applications.
>
> Turns out that in my .xinitrc is this line:
>
> xapm -geometry 150x20+0-0 &
>
> and "man xapm" has this little gem:
>
> ----
> -delay delay
> Sets the number of seconds delay between each update. The default is 1.
> ----
>
> Figuring that the BIOS call is expensive, I changed that default value to be
> 120 seconds, and sure enough, that appears to have fixed things.
>
> (Doing a "fuser /proc/apm" makes it appear that the device is opened *every*
> time it's read, which can't be good for thruput, as God only knows what the
> apm proc driver has to do on that open()- so I'll be sending a note to
> the "Xapm" maintainer about that and maybe changing the default polling
> time, too if when I download the latest version things work the same.)
>
> My apologies to the Xfree project; your product in fact works very well.
Take a look in your linux kernel configuration - is "disable interrupts
during APM calls" option enabled ?
Vladimir Dergachev
>
> -Kenny, glad this is over
>
> --
> Kenneth R. Crudup Sr. SW Engineer, Scott County Consulting, Washington, D.C.
> Home1: PO Box 914 Silver Spring, MD 20910-0914 [EMAIL PROTECTED]
> Home2: 38010 Village Cmn. #217 Fremont, CA 94536-7525 (510) 745-0101
>
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