Re: I've ran out of ideas

From: Aaron Glenn (aaron.glenn_at_gmail.com)
Date: 11/18/04

  • Next message: Aaron Glenn: "Re: I've ran out of ideas" 
    Date: Thu, 18 Nov 2004 09:22:34 -0800
To: Arne Wörner <arne_woerner@yahoo.com>

    d# dd if=/dev/ad2s1 of=/dev/null bs=64k count=1000
    1000+0 records in
    1000+0 records out
    65536000 bytes transferred in 1.353203 secs (48430278 bytes/sec)
    d#

    iostat has never gone above 3.8MB/s

    aaron.glenn

    On Thu, 18 Nov 2004 02:55:43 -0800 (PST), Arne Wörner
    <arne_woerner@yahoo.com> wrote:
    >
    >
    > > > I'm pushing large files via thttpd over low-end
    > > > hardware (celeron
    > > > 1.8GHz, 512MB RAM, UATA 100 drive) and, out of the
    > > > box, FreeBSD
    > > > 5.3-RELEASE topped out at 40Mbps sustained. After
    > > > creating a separate
    > > > partition with a much larger blocksize, it's hit
    > > > 50Mbps sustained but
    > > > won't go past 54Mbps at all.
    > >
    > > You could try adding/tweaking HZ to 1000/2000 in
    > > kernel and add kern.polling.enable=1 to
    > > /etc/sysctl.conf.
    > >
    > Here I would like to mention the man page polling(4) for clarification (it does
    > not look like the GENERIC kernel can do polling...).
    >
    > Furthermore I would like to know, how fast is a "dd if=/dev/discXY of=/dev/null
    > bs=64k count=1000" in single user mode on your box (I can do 42.8MByte/sec with
    > UDMA-100 and ST340015A (Seagate?))...
    >
    > -Arne
    >
    >
    > __________________________________
    > Do you Yahoo!?
    > The all-new My Yahoo! - Get yours free!
    > http://my.yahoo.com
    >
    >
    _______________________________________________
    freebsd-performance@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-performance
    To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"

  • Next message: Aaron Glenn: "Re: I've ran out of ideas"

    Relevant Pages

    • Display errors with iostat -e
      ... What is the cause of this errors with iostat -e ... device s/w h/w trn tot ... Want to start your own business? ... Learn how on Yahoo! ...
      (SunManagers)
    • iostat -x 2 only prints out 0!
      ... Recently, I am monitoring a storage for high concurrency IO, to tune it. ... While I am using iostat to see the speed per second, and await value. ... I found out that sometime, when the machine is working, iostat just gives out all 0 values for a few times, then return normal, or never until I reboot. ... To UNSUBSCRIBE, email to debian-user-REQUEST@xxxxxxxxxxxxxxxx with a subject of "unsubscribe". ...
      (Debian-User)
    • Re: Ive ran out of ideas
      ... Since there should not be so much I/O on an idle system, ... The all-new My Yahoo! ...
      (freebsd-performance)
    • Re: nfs-server twice as fast written to as read from
      ... What does iostat look like if you run it on both ... It sounds like one machine's disk is just plain slower than the other's. ... To unsubscribe, ...
      (freebsd-current)
    • Re: Ive ran out of ideas
      ... I read the iostat man page *after* sending to the list. ... macro in config.h actually decreased thoroughput, ... Regards, ... To unsubscribe, ...
      (freebsd-performance)