Re: Interesting speed benchmarks

On Tue, 2007-Jan-30 15:00:47 -0500, Robert Huff wrote:
huff@>>dump 0 -La -C 32 -f /dev/null /usr >& /tmp/null_dump
DUMP: DUMP: 27162681 tape blocks on 1 volume
DUMP: finished in 12961 seconds, throughput 2095 KBytes/sec

Still fairly atrocious. What about:
dd if=/dev/da1s1d of=/dev/null bs=2k count=5120
dd if=/dev/da1s1d of=/dev/null bs=16k count=640
dd if=/dev/da1s1d of=/dev/null bs=64k count=160

Filesystem 1024-blocks Used Avail Capacity iused ifree %iused Mounted on
/dev/da1s1d 46287340 26883474 15700880 63% 423220 5582538 7% /usr

There's definitely something amiss on your system. I don't have a SCSI
system at home but I see:

# dump -0a -f /dev/null -C 32 -L /var
...
DUMP: DUMP: 5825156 tape blocks on 1 volume
DUMP: finished in 533 seconds, throughput 10928 KBytes/sec
#
# dump -0a -f /dev/null -C 32 -L /usr
...
DUMP: DUMP: 2883438 tape blocks on 1 volume
DUMP: finished in 391 seconds, throughput 7374 KBytes/sec
# df -ki /usr /var
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounte
/dev/ad3s1d 8122126 2744650 4727706 37% 165650 894188 16% /usr
/dev/ad3s1e 8114104 5686582 1778394 76% 174183 885655 16% /var

Even my laptop manages:
# df -ki /usr
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted
/dev/ad0s2e 16244334 13028280 1916508 87% 616595 1503083 29% /usr
# dump -0a -f /dev/null -C 32 -L /usr
...
DUMP: DUMP: 13507693 tape blocks on 1 volume
DUMP: finished in 1425 seconds, throughput 9479 KBytes/sec

One last possibility: Is something else hammering da1? You might like
to have a look at iostat or systat -v and see if there's anything that
looks odd.

--
Peter Jeremy

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