signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64

Attilio Rao attilio at
Sat May 30 15:48:24 UTC 2009

2009/5/30 O. Hartmann <ohartman at>:
> Hello.
> I realized a significant slowdown of FreeBSD 8.0-CURRENT/amd64 on every
> box I run. I have the most recent FreeBSD 8.0-CURRENT/amd64 with custom
> kernel and switched off every debugging. I see a drastic slowdown
> whenever heavy I/O on UFS2 and ZFS partitions is performed and whenever
> some compilation is done (compiling world and kernel). This is horrible
> on a single core Athlon64 CPU with 2GB RAM as well as on a 4 core Q6600
> with 8GB and a server with 2 x 4-cores and 16GB RAM.
> I can not say clearly whether I/O is the bottleneck. Maybe something
> with the memory subsystem, when it comes to compiler runs, when no disk
> I/O is done but the box is still horrible slow. This behaviour occured
> several weeks ago, not being able to specify it more precisely.
> AQre there any issues at the moment?

Your kernel is compiled from which date?


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