Re: isp(4) annoying problems on PWS500au

[Erik Fair <fair%netbsd.org@localhost>]

The real problem with this error message is that the kernel is braying  
about a temporary error that it recovers from. I've been seeing this  
on a DigitalServer 3305 (nee AlphaServer 800 5/500; a 500 MHz 21164a  
system, originally with 500MB RAM, now with 2GB RAM) running NetBSD  
3.1 for some years now - my primary NFS server. It first showed up  
when I created an FFS on a striped CCD with 64k blocks, and reducing  
to 32k blocks didn't help.

My read of the code involved is that the isp(4) driver is making a few  
too many requests of the bus_space or bus_dma code when I/O piles up  
(forgot which - I looked a very long time ago), and doesn't back off.  
I see these every day with CVS updates.

        Erik <fair%netbsd.org@localhost>