"Frost, Stephen C" wrote:
> Oh FreeBSD Gurus...
>
> I tried throwing this out to the 'Questions' listserver and got zero reply.
> So....
>
> Is there some quick, down & dirty way of assessing the bus-speeds of PCI
> slots/busses on a given box? I have a whole rack of systems with FreeBSD
> 4.5 on 'em, and need to know the PCI bus configuration for each.
>
> Thank you in advance for your reply directly to this email account.
There are a couple of ways:
1) Read the specs on the hardware
2) Transfer data on and off some card memory for a card
known to be in the machine, and using the cycle counter
and you knowledge of the clock rate from sysctl space
to calculate it
If you use the second method, you will be able to tell 32 bit
33Mhz and 64 bit 66Mhz, but you won't be able to tell between
a 64 bit card in a 32 bit slot and a 32 bit card in a 64 bit
slot. Very annoying. 8-).
I recommend #1.
A third method that would require driver hacks would be to
do a series of small disk DMAs and time them for size and
size *2 so that they fit entirely in disk cache. The DMA
code isn't sufficiently instrumented for this, though.
A fourth method, which may or may not exist, is to make a
BIOS call and simply ask the hardware how fast it thinks
it is... being as you're at Intel, you chould have the PCI
technical documentation in your technical library.
-- Terry
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