SCSI driver/can_queue and cmd_per_lun

From: tcs (dzshen_at_winbond.com.tw)
Date: 04/30/04

  • Next message: Robert Nichols: "Re: why does exec-shield load .so @ diff addrs run to run" 
    Date: Fri, 30 Apr 2004 11:27:27 +0800

    Greetings:
      We already implemented a working PCI SCSI device driver but there are
    something we don't quite understand.

      In our driver, we set cmd_per_lun to 1 and can_queue to 1.

      We did some search on the internet and the explanation for can_queue is
    the "at most n outstanding command per LUN." This makes sense. can_queue is
    1 which means our driver can queue command asynchronously. This doesn't make
    sense to me. Can can_queue be anything from 0 to 100? What does it mean if
    can_queue is 10? Some sources in /driver/scsi directory have can_queue other
    than 1 and 0.

    thanks in advance

    tcs

  • Next message: Robert Nichols: "Re: why does exec-shield load .so @ diff addrs run to run"