Date: Fri, 4 Sep 1998 13:04:39 -0700 (PDT) From: Patrick Greenwell <patrick@namesecure.com> To: freebsd-scsi@FreeBSD.ORG Subject: AHC question Message-ID: <Pine.BSI.3.96.980904125351.20720A-100000@po1.namesecure.com>
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I have an Adaptec 2940UW hooked to a CMD-based subsystem. I have turned on all enabled all the performance options for the ahc driver (tag-queuing, SCB paging, and mmap I/O) option (FreeBSD 2.2.7-Release). boot -v offers this: Sep 4 04:37:48 test4 /kernel: ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 1 int a irq 15 on pci0:20:0 Sep 4 04:37:48 test4 /kernel: mapreg[10] type=1 addr=0000e800 size=0100. Sep 4 04:37:48 test4 /kernel: mapreg[14] type=0 addr=febe7000 size=1000. Sep 4 04:37:48 test4 /kernel: reg20: virtual=0xf96a1000 physical=0xfebe7000 size=0x1000 Sep 4 04:37:48 test4 /kernel: ahc0: Reading SEEPROM...done. Sep 4 04:37:48 test4 /kernel: internal50 cable not present Sep 4 04:37:48 test4 /kernel: internal68 cable not present Sep 4 04:37:48 test4 /kernel: brdctl == 0xec Sep 4 04:37:48 test4 /kernel: external cable is present Sep 4 04:37:48 test4 /kernel: eprom is present Sep 4 04:37:48 test4 /kernel: brdctl == 0xac Sep 4 04:37:48 test4 /kernel: low byte termination enabled, high byte termination enabled Sep 4 04:37:48 test4 /kernel: ahc0: aic7880 Wide Channel, SCSI Id=7, 16/255 SCBs Sep 4 04:37:48 test4 /kernel: ahc0: Resetting Channel A Sep 4 04:37:48 test4 /kernel: ahc0: Downloading Sequencer Program...ahc0: 417 instructions downloaded Sep 4 04:37:48 test4 /kernel: Done Sep 4 04:37:48 test4 /kernel: ahc0: Probing channel A Sep 4 04:37:48 test4 /kernel: ahc0 waiting for scsi devices to settle Sep 4 04:37:48 test4 /kernel: ahc0: target 0 using 16Bit transfers Sep 4 04:37:48 test4 /kernel: ahc0: target 0 synchronous at 20.0MHz, offset = 0x8 The question is how fast is this thing running? I am more used to BSDi which states the max transfer rate when it is bringing the device up. I have everything on the card and the CMD unit to do 40MB/sec. Does 20MHz == 20MB/sec, or is there something I am missing? Thanks! /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Patrick Greenwell (800) 299-1288 v Systems Administrator (925) 377-1212 v NameSecure (925) 377-1414 f Coming to the ISPF? The Forum for ISPs by ISPs http://www.ispf.com \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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