Date: Wed, 26 May 1999 13:49:08 +0800 From: Silver CHEN <silver@tomail.com.tw> To: "freebsd-stable@FreeBSD.ORG" <freebsd-stable@FreeBSD.ORG> Subject: [help] 3.2-stable LVD transfer rate drop to 11.xxx MB/s??? Message-ID: <374B8B54.ECA3EF85@tomail.com.tw>
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Dear Sir:
I've upgraded my 3.1R box to 3.2 due to the kernel panic under
heavy load. Now it's all done, and I reboot the box, then I
found my LVD disks' tranfer rate becomes:
da0 at ahc1 bus 0 target 0 lun 0
da0: <SEAGATE ST34573LW 5766> Fixed Direct Access SCSI-2 device
da0: 11.626MB/s transfers (5.813MHz, offset 15, 16bit)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
da0: 4340MB (8888924 512 byte sectors: 255H 63S/T 553C)
This is very funny, compared to 3.1R:
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST34573LW 5766> Fixed Direct Access SCSI-2 device
da0: 80.0MB/s transfers (40.0MHz, offset 15, 16bit), Tagged Queueing Enabled
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^!!!
da0: 4340MB (8888924 512 byte sectors: 255H 63S/T 553C)
I'm using the GENERIC kernel now, and both 3.1R/3.2 has detected the
SCSI controller sucessfully during boot:
ahc0: <Adaptec aic7896/97 Ultra2 SCSI adapter> rev 0x00 int a irq 10 on
pci0.12.0
ahc0: aic7896/97 Wide Channel A, SCSI Id=7, 16/255 SCBs
ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter> rev 0x00 int a irq 10 on
pci0.12.1
ahc1: aic7896/97 Wide Channel B, SCSI Id=7, 16/255 SCBs
Should I do something to 'fix' the transfer rate and the tagged
queue option?
The controller is expansive, the LVD disk is expansive, even the
LVD cable is expansive - this setting makes me very upset....:(
Thanks for your help.
Regards.
--
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
| Shan-Ta CHEN E-Mail : sansil@pchome.com.tw |
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