sio: lots of silo overflows on Asus K8V with Moxa Smartio C104H/PCI solved

[Burkard Meyendriesch]

On Mon, 3 May 2004 15:00:15 +1000 (EST) Bruce Evans wrote:

> On Sun, 2 May 2004, Burkard Meyendriesch wrote:
> 
> > On Sat, 1 May 2004 21:41:27 +1000 (EST) Bruce Evans wrote:
> > > ...
> > > %%%
> > > Index: sio.c
> > > =================================================================
> > > == RCS file: /home/ncvs/src/sys/dev/sio/sio.c,v
> > > retrieving revision 1.428
> > > diff -u -2 -r1.428 sio.c
> > > --- sio.c	30 Apr 2004 21:16:52 -0000	1.428
> > > +++ sio.c	1 May 2004 11:29:44 -0000
> > > @@ -1164,5 +1302,6 @@
> > >  		if (ret) {
> > >  			ret = BUS_SETUP_INTR(device_get_parent(dev), dev,
> > > -					     com->irqres, INTR_TYPE_TTY,
> > > +					     com->irqres,
> > > +					     INTR_TYPE_CLOCK | INTR_MPSAFE,
> > >  					     siointr, com, &com->cookie);
> > >  			if (ret == 0)
> > > %%%
> ...
> 
> You need to turn PUC_FASTINTR back off to test the patch.
> 
I disabled "options PUC_FASTINTR" in my kernel configuration file
and made a new kernel. The actual boot message is:

May  3 09:18:59 Reineke kernel: puc0: <Moxa Technologies, Smartio C104H/PCI> port 0xa000-0xa00f,0xa400-0xa43f,0xa800-0xa87f irq 19 at device 14.0 on pci0
May  3 09:18:59 Reineke kernel: puc0: Reserved 0x40 bytes for rid 0x18 type 4 at 0xa400
May  3 09:18:59 Reineke kernel: sio4: <Moxa Technologies, Smartio C104H/PCI> on puc0
May  3 09:18:59 Reineke kernel: sio4: type 16550A
May  3 09:18:59 Reineke kernel: sio4: unable to activate interrupt in fast mode - using normal mode

Doing my sio5 Palm backup test now I again get lots of silo overflows;
the input rate is in a range from 100 to 10000 chars/s and the puc
interrupt rate behaves similar: from 12 to 1200 ints/s. After several
minutes the Palm backup software gives up due to protocol errors
(maybe as a result of massive character losses).

If your patch only becomes effective without "options PUC_FASTINTR" it
does not seem to solve the sio interrupt problem in my environment.

Burkard 

--
Burkard Meyendriesch
Stevern 2
D-48301 Nottuln