Ultra2 transfer mode? - why only 40 MB/s ?

[Alex Farber]

Richard Kaszeta wrote:
>   Device using Wide/Sync transfers at
>   80.0 MByte/sec, offset 15

Hi guys,

unfortunately I can't follow you all very well, what does it 
mean "sync/async"? I am using pre15 and it works fine, but
I have a feeling that it is slower than win95 on the same
ultra-wide scsi drive... I would appreciate if someone gives
me a tip - should I use some comand line switch or smth. else?

Thank you!
Alex


PS: Here's what I get from cat /proc/scsi/aic7xxx/0:


Adaptec AIC7xxx driver version: 5.1.0pre15/3.2.4
Compile Options:
  AIC7XXX_RESET_DELAY    : 5
  AIC7XXX_TAGGED_QUEUEING: Adapter Support Enabled
                             Check below to see which
                             devices use tagged queueing
  AIC7XXX_PAGE_ENABLE    : Enabled (This is no longer an option)
  AIC7XXX_PROC_STATS     : Disabled

Adapter Configuration:
           SCSI Adapter: Adaptec AIC-7890/1 Ultra2 SCSI host adapter
                           Ultra2-LVD/SE Wide Controller
    PCI MMAPed I/O Base: 0xe1000000
 Adapter SEEPROM Config: SEEPROM found and used.
      Adaptec SCSI BIOS: Enabled
                    IRQ: 11
                   SCBs: Active 0, Max Active 1,
                         Allocated 15, HW 32, Page 255
             Interrupts: 3937
      BIOS Control Word: 0x18a6
   Adapter Control Word: 0x005c
   Extended Translation: Enabled
Disconnect Enable Flags: 0xffff
     Ultra Enable Flags: 0x0000
 Tag Queue Enable Flags: 0x0000
Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 8
    Tagged Queue By Device array for aic7xxx host instance 0:
      {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255}
    Actual queue depth per device for aic7xxx host instance 0:
      {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}

Statistics:
(scsi0:0:0:0)
  Device using Wide/Sync transfers at
  40.0 MByte/sec, offset 15
    Device Negotiation Settings
        Period Offset Bus Width
User       010    127        1
Goal       010    127        1
Current    012    015        1
    Total transfers 3882 (3537 read;345 written)
      blks(512) rd=34041; blks(512) wr=1068

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