Re: Interesting speed benchmarks

On Tue, 2007-Jan-30 15:00:47 -0500, Robert Huff wrote:
>huff_at_>>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