Disk performance on ESXi with FreeBSD 7.1

[Sebastiaan van Erk]

Hi Scott,

>> <n>             1               2               4
>> freebsd         12.0009         13.6348         12.9402         (MB/s)
>> linux           376.145         651.314         634.649         (MB/s)
>>
>> Thus there is approx a factor 30 difference for dbench 1, and I cannot 
>> imagine linux being that much faster just due to some performance 
>> tuning kernel parameters.

> sudo camcontrol tags da0
> 
> If it returns something like this:
> 
> (pass0:mpt0:0:0:0): device openings: 1

Yep, exactly that; the bt0 driver returned 2.

> then run the following command:
> 
> sudo camcontrol tags da0 -N 64

(pass0:mpt0:0:0:0): tagged openings now 64
(pass0:mpt0:0:0:0): device openings: 64

> If this works in improving performance, it can be put into a startup
> script.  I have no idea why the controller is misbehaving with this yet,
> but I'm working on it.
> 
> Scott

Unfortunately I'm still stuck at around 12-14MB/s on both the bt0 and 
mpt0 controllers, so the performance is not up.

Thanks a lot though for the help, if I can do/test anything else, I'm 
right on it.

Regards,
Sebastiaan
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