Post 9.1 stable file system problems

[Dominic Fandrey]

I have a Tinderbox that I just updated to the current RELENG_9.
Following the update build times for packages have increased by a
factor between 5 and 20. I.e. I have packages that used to build in
5 minutes and now take an hour.

I'm suspecting the file system ever since I saw that the majority of CPU
load was caused by ls when I looked at top (more than 2 minutes of CPU
time were counted that moment). The majority of the time most of the CPU
load is caused by bsdtar, pkg_add, qmake-qt4, etc. Without exception
tools that access a lot of files.

The file system on which packages are built is nullfs mounted from
an async mounted UFS. I turned async off, to no avail.

/usr/src/UPDATING says that there were nullfs optimisations. So I
think this is where the problem originates. I might hack the tinderbox to
use 'ln -s' or set it up for NFS to verify this.

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