Re: 6.0 and "options PREEMPTION"

From: Doug Poland (doug_at_polands.org)
Date: 10/28/05

  • Next message: Massimo Lusetti: "Re: Timers and timing, was: MySQL Performance 6.0rc1" 
    Date: Fri, 28 Oct 2005 08:56:38 -0500
To: Robert Watson <rwatson@freebsd.org>

    On Fri, Oct 28, 2005 at 02:04:37PM +0100, Robert Watson wrote:
    > On Thu, 27 Oct 2005, Doug Poland wrote:
    >
    > > One of the other nice benefits to the SMPVFS work is that with our
    > > fully preemptive 6.x kernel, not holding the Giant lock over the
    > > file system code lets the file system code not only preempt lower
    > > precedence kernel threads, such as background crypto operations or
    > > file system operations, but be preempted by more timing critical
    > > code, such as sound card interrupts, network I/O, and so on.
    > >
    > >Does this mean that options PREEMPTION is assumed in 6.0? If not,
    > >could someone explain or point me to some docs that will help me
    > >understand.
    >
    > In FreeBSD 6.0 and higher, options PREEMPTION appears in the default
    > kernel configuration (GENERIC).
    >
    Thank you

    > When upgrading from earlier revisions, if you keep the same config
    > file, you'll need to add it manually. With the advent of "include"
    > support in newer FreeBSD versions, I find I generally have my own
    > include file include GENERIC, then add nodevice/nooptions to remove
    > things I don't want, and device/options to add things I do want. The
    >
    I've been using the include technique for some time but was unaware of
    nodevice/nooptions. Sounds cleaner that commenting out unwanted devices
    and options. 

    -- 
Regards,
Doug
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
  • Next message: Massimo Lusetti: "Re: Timers and timing, was: MySQL Performance 6.0rc1"