Strange PMAC IDE performance problem

[Albrecht Dreß]

Benjamin Herrenschmidt wrote:
[snip]
> Is there some common denominator with all those problems ? For example, I
> never connect anything to my PowerBook's MESH. Did the people with the
> problem have something connected to it ? never ? always ? both ? Maybe we
> could collect the disk models to see if the seem to be related. Also, are
> the problem similar when booting with OF and BootX or are there any
> differences ?

I use the latest test kernel form your web page (2.1.130 with patches; btw. the
trackpad patch is REALLY great!!) and boot with BootX 1.0.1. Bogus interrupts
appear both with nothing attached to external SCSI and with a tape drive. I get
very few bogus irq's from via_pmu_interrupt (c01d43fc, c01d4410) and LOTS from
do_IRQ (c0005518) in both cases. According to /proc/interrupts, doing a dd of
200 MBytes form /dev/zero to the internal hd resulted in 31 bad irq's from
do_IRQ (and a transfer rate of 1.71 MB/s).

Some time ago I compiled a 2.1.130 kernel WITHOUT SCSI/MESH SUPPORT (also booted
via BootX), but got exactly the same results as with the "normal" kernels.

Yours, Albrecht.

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| Dr.-Ing. Albrecht Dre\3                                      ----           |
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