signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64

Attilio Rao attilio at
Sat May 30 16:52:01 UTC 2009

2009/5/30 Attilio Rao <attilio at>:
> 2009/5/30 O. Hartmann <ohartman at>:
>> Attilio Rao wrote:
>>> 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?
>>> Thanks,
>>> Attilio
>> Most recent, say: yesterday! As well as world.
> Can you try to revert only r193011 and see if something changes?

Also, did you compile the single-core athlon64 without the option SMP?


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