>> I have a KT7 with an athlon 1.1, no problems with ATA66, don't have a 100
>> drive though.  Works fine, does make worlds in a little over an hour with
>> 384mb of pc133, but I do have to downclock the pc133 to 100 because these
>> via chips have some problem with agp and pc133 at the moment.
>Another datapoint - I have an MSI 694D motherboard, with Via Apollo Pro
>133A chipset, 2 x PIII-800EB, 4 x IBM 75GXP disks (two on ATA-66, two on
>ATA-100). Works like a charm, extremely stable, runs continuous buildworld
>and untar/rm ports with no problem. PC-133 memory, running at 133 Mhz. No
>overclocking, adequate cooling.

>FreeBSD 4.2-STABLE #2: Mon Dec 25 12:01:26 CET 2000
>    [EMAIL PROTECTED]:/usr/local/freebsd/stable4/src/sys/compile/MGMTSRV
>Timecounter "i8254"  frequency 1193182 Hz
>CPU: Pentium III/Pentium III Xeon/Celeron (801.82-MHz 686-class CPU)
>  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6
>real memory  = 536805376 (524224K bytes)
>avail memory = 519806976 (507624K bytes)
>Programming 24 pins in IOAPIC #0
>IOAPIC #0 intpin 2 -> irq 0
>FreeBSD/SMP: Multiprocessor motherboard
> cpu0 (BSP): apic id:  0, version: 0x00040011, at 0xfee00000
> cpu1 (AP):  apic id:  1, version: 0x00040011, at 0xfee00000
> io0 (APIC): apic id:  2, version: 0x00170011, at 0xfec00000

Maybe this is misleading... But: I have an old HP Vectra XU with SCSI
disks showing exactly the same behaviour. With SMP enabled it hangs
under heavy disk activity, with single processor it works just fine.
(Recent -STABLE of course, but it has been like this since 4.0.)

Maybe this is not related to ATA at all? Is this an SMP issue (again)?


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