2 x quad-core system is slower that 2 x dual core on FreeBSD

Kris Kennaway kris at FreeBSD.org
Tue Nov 20 13:33:32 PST 2007

Claus Guttesen wrote:
>>> FWIW, we are seeing 2 x quad-core 2.66GHz outperform (per core) 2 x
>>> dual-core 3GHz on the same type of m/b, apparently because of better
>>> bandwidth to memory. However, this is on a compute-intensive workload
>>> running 1 job per core so would be pretty insensitive to
>>> scheduler/locking issues.
>> Alexey's problem is pretty specific to filesystem performance.  Good to
>> hear though :)
> If that is the conclusion, wouldn't it make sense trying a different
> disk-controller then?

Filesystem, not disk.  See my earlier email for more detailed discussion.


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