Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64

Attilio Rao wrote:
> 2009/5/30 Attilio Rao <attilio_at_freebsd.org>:
>   
>> 2009/5/30 O. Hartmann <ohartman_at_mail.zedat.fu-berlin.de>:
>>     
>>> Attilio Rao wrote:
>>>       
>>>> 2009/5/30 O. Hartmann <ohartman_at_mail.zedat.fu-berlin.de>:
>>>>
>>>>         
>>>>> 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?
>
> Thanks,
> Attilio
>
>
>   

Yes, I did of course compile kernel on UP without option SMP and of
those with more than on logical core with SMP on.

I will try to revert to r193011.

Oliver