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Date: Tue, 15 Mar 2005 09:00:37 -0500 (EST)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Sergey Matveychuk <sem@freebsd.org>
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cc: Denis Shaposhnikov <dsh@neva.vlink.ru>
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cc: Mathieu Arnold <mat@mat.cc>
cc: Peter Edwards <peadar.edwards@gmail.com>
Subject: Re: unionfs 5.4
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On Sun, 13 Mar 2005, Sergey Matveychuk wrote:

> Peter Edwards wrote:
>
> > If someone experiencing these issues could try rebuilding after changing
> >
> > #define NNULLNODECACHE 16
> > to
> > #define NNULLNODECACHE 1024
> >
> > in null_subr.c (line 50 in my version, 1.45)
> >
> > And just see if it makes much of a difference. If so, it might be
>
> It does not help. The problem with nullfs only in jail environment.
> I've made a simple test: build devel/gettext port. Here is results:
>
> just ffs: 1:47 min
> nullfs:   1:43 min (oops!:)
> nullfs in jail: 12:12 min
>
> Almost ten times degradation.

Can you try this again on current?  I just committed some changes to
nullfs which vastly simplify the locking.  I don't see anything inherent
in the code that should cause such a slowdown.

>
> --
> Sem.
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