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Date:      Sat, 26 Jun 1999 08:06:31 -0400 (EDT)
From:      Matt Behrens <matt@zigg.com>
To:        Alex Povolotsky <tarkhil@asteroid.svib.ru>
Cc:        aphor@ripco.com, stable@FreeBSD.ORG
Subject:   Re: Panic: ffs_clusteralloc: map mismatch 
Message-ID:  <Pine.BSF.4.10.9906260801370.3516-100000@megaweapon.zigg.com>
In-Reply-To: <199906260746.LAA21649@shuttle.svib.ru>

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On Sat, 26 Jun 1999, Alex Povolotsky wrote:

: Softupdates gave me huge (x2 on sam tasks) performance boost, but I've got a 
: drawback also. I guess it happens only on IDE systems, I haven't met this 
: disaster on SCSI.
: 
: Any process actively using disk (starting exmh or netscape are the most common 
: of them) causes all other processes literelly to halt. Even response to enter 
: pressed in shell delays by about 1-2 seconds.

[snip!]

: I'm using 3.2-19960619, 

[snip!}

I hope you meant 1999 :-)  Seriously, though...

This was a symptom I used to see back when I had the serious troubles
with softupdates that would routinely take down my systems under
silly things like make world or untarring a large tarball.  I don't
see them anymore, and I exclusively use IDE here at home due to
the ever-popular $$$ issue. :-)  I used to be able to predict when
the system was about to hang -- the disk would go wildly and, like
you describe, all processes would momentarily stop, as if interrupts
were all being overridden or something.  However, I honestly don't
see it anymore, and I don't exactly have spectacularly powerful
systems (my most-thrashed box is a P90 with a 3.7GB).

Still, back when I had these problems, I was one of the few.  So
I'm hopeful for you that someone can track down what you're seeing.

Matt Behrens <matt@zigg.com>
Owner/Administrator, zigg.com
Chief Engineer, Nameless IRC Network



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