On Mon, 4 Dec 2000, Ben Harris wrote:

> On Sun, 3 Dec 2000, Kjetil B. Thomassen wrote:
> 
> > The last stuff before it hang is:
> > root file system type: nfs
> > init: copying out path '/sbin/init' 11
> 
> Odd.  My system was panicking at that point until I put in a small change
> (not committed because I don't think it's correct) which caused it to hang
> instead.  I think that UBC currently has a problem with systems with >8k
> page size.  I'll raise this on tech-kern if I get a chance, but at least
> one place where the problem is obvious is in (from memory) ubc_fault(),
> where it does an integer divide of UBC_WINSIZE (8192) by PAGE_SIZE (32768)
> and uses the result as the number of pages to fault in (or something like
> that).

One thing to note here is that the error message from init did not occur
with my previous FOURMEG kernel, so I will try again tonight or tomorrow.

> > It looks as though there may be problem with I/O, so this is something
> > that needs to be looked into.
> 
> I think it's a VM system problem.  I'll look into it when I get a chance,
> but that may not be till the weekend.  It takes me quite a lot of
> concentration to understand that area of the kernel.

OK, fine.

> > Is there anything I can do to try to trace this further?
> 
> options UVMHIST tends to be quite useful for this kind of thing.  Look in
> sys/uvm/uvm_stat.c for stuff you can do with it.  UBC keeps its own
> history, which ISTR you can get at by typing "call uvmhist_dump(ubchist)"
> at db>.

OK, I'll see what I can do.

> > BTW, my ST-506 drive has died, so I am now booting over sharefs. It
> > would be handy if I could get your AUN stuff running on my ss2.
> 
> When I get my hands on the sources again, I'll slap them on ftp.netbsd.org
> so we don't lose them again.  Anyone got a combined PCI SCSI/Ethernet
> card spare?

Sorry, I don't.

Kjetil B.
mailto:kjetil@thomassen.priv.no
http://www.thomassen.priv.no/