D.5 OpenBSD

The results in this section are from OpenBSD Version 3.3 (released May 1, 2003). I built a kernel with the following notable configuration options:

option          MSGMNB=8192

option          MSGMNI=40

option          MSGSEG=512

option          MSGSSZ=64

option          MSGTQL=2048

option          SHMSEG=16

option          SHMMNI=32

option          SHMMAX=2048

option          SHMALL=4096

option          NMBCLUSTERS=32768

option          MAXFILES=8192

Table D-3 and Figure D-3 summarize the OpenBSD results. The choices for OpenBSD are similar to those for FreeBSD. Unfortunately, however, coss doesn't run on OpenBSD, which lacks the aio_read( ) and aio_write( ) functions.

Table D-3. OpenBSD benchmarking results

Storage scheme

Filesystem

Mount options

Throughput

Response time

Hit ratio

diskd(1)

UFS

async, noatime, softupdate

91.1

1.45

56.3

diskd(2)

UFS

 

63.7

1.44

56.2

ufs(1)

UFS

softupdate

27.6

1.51

56.3

ufs(2)

UFS

noatime

25.1

1.52

56.3

ufs(3)

UFS

 

22.7

1.52

56.1

ufs(4)

UFS

async

22.1

1.51

56.6

Figure D-3. OpenBSD filesystem benchmarking traces
figs/SQ_ad03.gif

In general, the OpenBSD results are slightly worse than FreeBSD. This isn't too surprising, given that the OpenBSD project emphasizes security and perhaps spends less time on filesystem performance.

One odd result is that using the async option (alone) caused a slight decrease in performance for the ufs storage scheme.



    Appendix A. Config File Reference
     
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