From owner-freebsd-scsi  Tue Aug 24  0:30:32 1999
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Date: Tue, 24 Aug 1999 02:27:44 -0500
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To: freebsd-scsi@freebsd.org
Subject: The I/O is too slow than linux
From: "Geocrawler.com" <archiver@db.geocrawler.com>
Reply-To: "liudong" <shift@263.net>
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This message was sent from Geocrawler.com by "liudong" <shift@263.net>
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some of dmesg
 output:

.....
ahc0: aic7896/97 Wide Channel A, SCSI Id=7, 16/255 SCBs
ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter> rev 0x00 int a irq 19 on pci0.12.1
ahc1: aic7896/97 Wide Channel B, SCSI Id=7, 16/255 SCBs
......
Waiting 5 seconds for SCSI devices to settle
pass4 at ahc1 bus 0 target 6 lun 0
pass4: <ESG-SHV SCA HSBP M6 0.61> Fixed Processor SCSI-2 device
pass4: 3.300MB/s transfers
da0 at ahc0 bus 0 target 0 lun 0
da0: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device
da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da0: 17501MB (35843520 512 byte sectors: 255H 63S/T 2231C)
da1 at ahc0 bus 0 target 0 lun 1
da1: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device
da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da1: 35003MB (71687040 512 byte sectors: 255H 63S/T 4462C)
da2 at ahc0 bus 0 target 0 lun 2
da2: <D.I.C. DA3500G2 0222> Fixed Direct Access SCSI-2 device
da2: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da2: 17501MB (35843520 512 byte sectors: 255H 63S/T 2231C)
changing root device to da0s1a
da3 at ahc1 bus 0 target 1 lun 0
da3: <IBM DNES-318350Y SA30> Fixed Direct Access SCSI-3 device
da3: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da3: 17501MB (35843670 512 byte sectors: 255H 63S/T 2231C)
ffs_mountfs: superblock updated for soft updates
ffs_mountfs: superblock updated for soft updates

then run ...
# time dd if=/dev/da0 of=/dev/null count=200000
200000+0 records in
200000+0 records out
102400000 bytes transferred in 36.852771 secs (2778624 bytes/sec)

real    0m36.911s
user    0m0.372s
sys     0m5.982s
  			
The same computer in linux(2.2.5):
# time dd if=/dev/sda of=/dev/null count=200000
200000+0 records in
200000+0 records out
0.52user 2.29system 0:09.05elapsed 31%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (89major+13minor)pagefaults 0swaps

What is the problem!!??


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