open("/dev/cuaaX") is slow

From: Andrew L. Neporada (andr_at_dgap.mipt.ru)
Date: 04/29/05

  • Next message: Peter Losher: "Re: Very low disk performance Highpoint 1820a" 
    Date: Fri, 29 Apr 2005 15:26:34 +0400
To: freebsd-hackers@freebsd.org

    Hi, hackers!

    It seems that reopening /dev/cuaaX devices after close() takes exactly
    3 seconds on FreeBSD 4.10 (sorry, I've no 5.x systems available at the
    moment).

    Here is output of attached program:
    open() time: 155 us
    open() time: 2995729 us
    open() time: 2999811 us
    open() time: 2999608 us
    open() time: 2999711 us
    open() time: 2999720 us
    open() time: 2999713 us
    open() time: 2999744 us
    open() time: 2999673 us
    open() time: 2999706 us

    Is this 3 second delay necessary? Can I get rid of it?

                                    Andrew.

    _______________________________________________
    freebsd-hackers@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
    To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"

  • Next message: Peter Losher: "Re: Very low disk performance Highpoint 1820a"