80MB/s not 160MB/s

[Mike R. Cannon]

Below are some logs messages from the default kernel and my fresh
kernel.  Basically I'm not getting 160MB/s after I perform a compile of
the kernel.  The default RedHat 7.2 install does get 160MB/s.  The
default install uses initrd to load the AIC7XXX driver.  I compile it
right into the kernel, not as a module.

How can I get the speeds backup to 160MB/s




A default RedHat 7.2 install yields the following in /var/log/dmesg:
SCSI subsystem driver Revision: 1.00
(scsi0) <Adaptec AIC-7892 Ultra 160/m SCSI host adapter> found at PCI
2/7/0
(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
(scsi0) Downloading sequencer code... 396 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.2.4/5.2.0
       <Adaptec AIC-7892 Ultra 160/m SCSI host adapter>
  Vendor: COMPAQPC  Model: DDYS-T18350N      Rev: B93E
  Type:   Direct-Access                      ANSI SCSI revision: 02
  Vendor: COMPAQPC  Model: DDYS-T18350N      Rev: B93E
  Type:   Direct-Access                      ANSI SCSI revision: 02
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0
(scsi0:0:0:0) Synchronous at 160.0 Mbyte/sec, offset 63.
SCSI device sda: 35565080 512-byte hdwr sectors (18209 MB)
Partition check:
 sda: sda1 sda2 sda3
(scsi0:0:2:0) Synchronous at 160.0 Mbyte/sec, offset 63.
SCSI device sdb: 35565080 512-byte hdwr sectors (18209 MB)
 sdb:




A fresh new kernel 2.4.16 yields the following in /var/log/dmesg:
SCSI subsystem driver Revision: 1.00
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.4
        <Adaptec aic7892 Ultra160 SCSI adapter>
        aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs

  Vendor: COMPAQPC  Model: DDYS-T18350N      Rev: B93E
  Type:   Direct-Access                      ANSI SCSI revision: 02
  Vendor: COMPAQPC  Model: DDYS-T18350N      Rev: B93E
  Type:   Direct-Access                      ANSI SCSI revision: 02
scsi0:A:0:0: Tagged Queuing enabled.  Depth 253
scsi0:A:2:0: Tagged Queuing enabled.  Depth 253
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0
(scsi0:A:0): 80.000MB/s transfers (40.000MHz, offset 63, 16bit)
SCSI device sda: 35565080 512-byte hdwr sectors (18209 MB)
Partition check:
 sda: sda1 sda2 sda3
(scsi0:A:2): 80.000MB/s transfers (40.000MHz, offset 63, 16bit)
SCSI device sdb: 35565080 512-byte hdwr sectors (18209 MB)
 sdb:

-- 
Mike Cannon
Infrastructure Systems Administrator
Management Information
Purdue University
1061 Freehafer Hall (FREH)
West Lafayette, IN  47907-1061

office phone: 765.494.6357
office fax: 765.496.1380
email: cannon at purdue.edu

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