Odd RS232 problem

Daniel O'Connor doconnor at gsoft.com.au
Tue May 23 04:53:11 PDT 2006

On Tuesday 23 May 2006 21:18, Daniel O'Connor wrote:
> On Tuesday 23 May 2006 19:45, Peter Jeremy wrote:
> > On Tue, 2006-May-23 19:23:20 +0930, Daniel O'Connor wrote:
> > >I would hope that 9600 baud wouldn't be *too* fast for a 2GHz CPU :(
> >
> > That depends on what else is sharing the IRQ.  PLIP can give you
> > 10's of msec of latency.  PIO disks can also destroy latency as
> > can NE2000-style NICs.
> Hmm, well I just realised I don't actually know what it IS sharing an IRQ
> with as puc/sio don't say :(

Duh I am blind..
It shares an IRQ with the RAID controller..

atapci0: <Promise PDC20378 SATA150 controller> port 0x7800-0x783f,0x7400-0x740f,0x7000-0x707f mem 0xfb300000-0xfb300fff,0xfb200000-0xfb21ffff irq 18 at device 8.0 on pci0
puc0: <Dolphin Peripherals 4036> port 0x9400-0x941f irq 18 at device 13.0 on pci0

The disks are SATA150 though, no PIO here!

Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
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