Kathy Frazier wrote:
> Thanks for your reply, Andi.
>
>
>>>We have a proprietary PCI board installed in a (UP) system with an ASUS
>
> P4PE
>
>>>motherboard (uses Intel 845PE chipset). This system is running Red Hat
>
> 9.0
>
>
>>Have you checked the 845 errata sheets on the Intel website?
>>Perhaps it is some known hardware bug.
>
>
>>One thing you could try is to use Local APIC / IO APIC interrupt processing
>>instead of 8259.
>
>
> Our hardware engineer has combed the Intel and ASUS websites, but found
> nothing. I'll give the APIC a try and see if I get different results and
> let you know.
>
>
>>>/* start timer */
>>>dmatimer.expires = jiffies + 0.5*HZ;
>
>
>>That's a serious bug. You cannot use floating point in the kernel.
>>It will corrupt the FP state of the user process.
>
>
> HZ on the INTEL platform is 100, so this should simply add 50 to the current
> value of jiffies. Besides, assigning the value to the unsigned int field
> (expires) will truncate it to an integer anyway.
Use HZ/2 instead. GCC doesn't optimize floating point constants to the
same degree it does integers, because it doesn't know what mode
(rounding, precision) the FPU is in.
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This archive was generated by hypermail 2b29 : Tue Jul 15 2003 - 22:00:58 EST