On Fri, Jun 03, 2005 at 02:33:37PM -0400, Sean Davis wrote:
> On Fri, Jun 03, 2005 at 01:56:11PM -0400, Perry E. Metzger wrote:
> > That's really bizarre. First, I've been using softdeps for years now
> > without any issues, under a wide variety of kernels. Second, I get
> > serious problems with I/O pausing for long periods if I don't turn on
> > NEW_BUFQ_STRATEGY....
> 
> I agree, it's bizarre. I've talked to tons of people who have no problems
> with softdeps at all, and use NEW_BUFQ_STRATEGY without any issues there,
> either. I highly doubt it's hardware issue on my side, but who knows... a
> storage controller driver not playing well with other code, perhaps? At this
> point all I have is guesses, but running !softdep !new_bufq performs quite
> well on this machine.

Softdeps seems to lose on hosts with slow CPUs---for example, Soekris
45x1s.  Comparing notes with gavan@, this jives with his experience.
Maybe softdep is racing some peripheral or controller?

Dave

-- 
David Young             OJC Technologies
dyoung@ojctech.com      Urbana, IL * (217) 278-3933