Performance benchmarks pitting FreeBSD against Windows

Ivan Voras ivoras at freebsd.org
Mon Dec 8 03:49:32 PST 2008


Wojciech Puchar wrote:
>>> changed it to 1MB everywhere.
>>
>> I've found that increasing vfs.read_max increases read performance
>> quite a bit in bonnie++ benchmarks.
>>
>> sysctl vfs.read_max=32
> 
> what exactly this option do?
> 
> read_max 32 <what?>
> 
> UFS blocks? MAXPHYS blocks?

UFS blocks.

The default is 8 == 128 kB == MAXPHYS.

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