Re: Is -current really this slow, or do I have something mis-configured?

From: Marc G. Fournier (scrappy_at_hub.org)
Date: 04/20/04

  • Next message: Doug White: "Re: small note to GENERIC for isa dependency" 
    Date: Mon, 19 Apr 2004 21:43:38 -0300 (ADT)
To: Willem Jan Withagen <wjw@withagen.nl>

    Stupid me, I had commented out KERNCONF in my /etc/make.conf at some
    point, so I've been building a GENERIC kernel without realizing it :(
    Just re-built a new kernel and installed, which will hopefully fix that up
    for tomorrow when I get back to the office *cross fingers*

    On Tue, 20 Apr 2004, Willem Jan Withagen wrote:

    >
    > ----- Original Message -----
    > From: "Marc G. Fournier" <scrappy@hub.org>
    > To: <freebsd-current@freebsd.org>
    > Sent: Monday, April 19, 2004 11:04 PM
    > Subject: Is -current really this slow, or do I have something mis-configured?
    >
    >
    > >
    > > I'm running -CURRENT on my desktop ... the machine is a P4, no HTT, and
    > > 512Meg of RAM ... and I swear the machine is less responsive then my
    > > laptop running on a Celeron 333 with ~192 Meg of RAM ... both are IDE
    > > drives, both are runing X and both are -current ...
    >
    > If you are running -CURRENT with WITNESS and all other assert stuff then
    > there could be a serious "penalty" you pay. And there is a good reason for it:
    >
    > Nota Bene:
    > Turn off WITNESS and INVARIANTS only
    > when benchmarking or for production systems
    > Robert Watson writes: "We turn them off in releases,
    > and once 5.x becomes 5-stable, we'll turn it off by default also. However,
    > they're invaluable tools when debugging the development system, so we have
    > them on in the development branch by default. I would encourage people to
    > generally run with them turned on unless performance of a system requires
    > them to be off, as it really helps the debugging process, as well as
    > helping to identify locking problems as the system evolves."
    >
    >
    > You might want to look at the stats I have for a simple bonnie run with and
    > without
    > the WITNESS stuff. Block Write throughput is not much different, but there is a
    > huge
    > difference when "fetching" data which was still in memory. I could very well
    > imagine
    > that a similar effect would impact your feel of responsiveness.
    > http://freebee.digiware.nl/FreeBSD/NFS-performance/#bonnie-local
    >
    > --WjW
    >
    > 

    ----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664
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  • Next message: Doug White: "Re: small note to GENERIC for isa dependency"

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