Re: FreeBSD 5.3R SMP Kernel not detecting 2nd CPU in a HP DL360(?)

From: Rojer (myself_at_rojer.pp.ru)
Date: 03/29/05

  • Next message: Ulf Zimmermann: "Re: FreeBSD 5.3R SMP Kernel not detecting 2nd CPU in a HP DL360(?)" 
    Date: Tue, 29 Mar 2005 03:02:02 +0400
To: ulf@Alameda.net

    Ulf Zimmermann wrote:
    >
    > I have a DL380 g3 with dual P4-3.2GHz 1MB L3 cache, the kern conf has
    > just "options SMP" to make it work. Here is the top part and bottom part
    > of dmesg from boot:
    > ...

    >
    > SMP: AP CPU #1 Launched!
    >
    > ...
    >
    > kern.smp.active: 1
    > kern.smp.disabled: 0
    > kern.smp.cpus: 2

    you should see 4 cpus "launching", assuming you haven't disabled hyperthreading.

    in fact, i have seen similar situation myself.
    FreeBSD would not recognize second physical CPU with hyperthreading enabled.
    it'd launch cpu #1 but not cpus 2 and 3.
    after eventually noticing it, i tried disabling hyperthreading in BIOS -
    it worked fine. i still had 2 cpus, but this time 2 physical cpus,
    and lower cpu load figures confirmed that those 2 "previous" cpus were in fact
    one physical + 1 hyperdreaded :)
    and this is not a problem of the particular server, i actually tried replacing
    the platform (moved hdds to the same box nearby) and it behaved in exactly the same manner.
    the platform is Fujitsu RX200 (2 x 2.8 Xeon), OS is FreeBSD 4.11-PRERELEASE.

    i still kinda have a box to play with (can bring it down to test during weekend),
    so if someone can offer insight, i can provide more info and maybe even a short-term
    remote ssh/serial console access. 

    -- 
Deomid Ryabkov aka Rojer
myself@rojer.pp.ru
rojer@sysadmins.ru
ICQ: 8025844

  • Next message: Ulf Zimmermann: "Re: FreeBSD 5.3R SMP Kernel not detecting 2nd CPU in a HP DL360(?)"