> On Thursday, 30 December 1999 at 22:34:04 -0800, Mike Smith wrote:
> >> That is interesting. So I guess the conclusion to this is, softupdates
> >> is useful for bursty IO, but not sustained because it can get far behind
> >> until it eventually reaches the point where the machine reboots silently.
> >> I guess the delay until reboot is dependent on the size of max_softdeps.
> >> If it is big, it takes a while.
> >
> > I mentioned this a while back in the context of suspended I/O (in this
> > case, a RAID array busy dealing with a failed disk). There wasn't much
> > interest in dealing with it evinced at that point.
>
> On a related topic, I've taken to limiting the number of outstanding
> transactions in Vinum, mainly to try to hunt down some strange
> consistency problems when a very large number of transactions were
> outstanding (for those of you who have been following this, this was
> the "NULL b_biodone" syndrome). I still think there is a problem
> hidden in the system which causes this.
I've stopped seeing these in the Mylex driver after I stopped assuming
that splbio() woult block re-entry into the strategy handler.
In fact, if we had a lock-and-mask-interrupt primitive I wouldn't be
using spl-anything, and I think that's the way we want to go.
--
\\ Give a man a fish, and you feed him for a day. \\ Mike Smith
\\ Tell him he should learn how to fish himself, \\ [EMAIL PROTECTED]
\\ and he'll hate you for a lifetime. \\ [EMAIL PROTECTED]
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