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Date:      Mon, 10 Apr 2000 18:22:27 -0500
From:      "Duncan, Eric A." <eduncan@idealmusic.com>
To:        <freebsd-questions@freebsd.org>
Subject:   Serious SMP Problems on Dell PE 2450.
Message-ID:  <NDBBIMCDELJLMJDJPOFIOENMCDAA.eduncan@idealmusic.com>
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[-- Attachment #1 --]
Basically, I enable SMP support and the system hangs on the PCI probing on
boot up.  I originally wanted to install 3.4.  Here's the configuration:

Dell Power Edge 2450
Dual 733mhz 133mhz bus P-IIIs
512megs
Adaptec 7899 U2W SCSI (2940 ahc driver)
  ^- Important info below.

Here's the story:

FreeBSD 3.4
----------------
Upon installing 3.4 from the floppies (ftp install), the kernel never found
the SCSI controller (ahc0).  It never even probed it during the PCI scan.  I
even tried a 3.3-STABLE kernel without success.  I built a custom kernel on
another box building in the ahc0 driver.  I even tried wiring down devices,
calling scsibus, setting them manually, setting with '?'s.  I tried it all
and built a new kernel every time.  Even making sure the boot loader wasn't
di'ing it.

The ahc controller was never probed upon boot.  It never even showed 'ahc0:
not found'.  Nothing.  Very odd!


FreeBSD 4.0
----------------
Immediately FBSD4 found the ahc0 controller and loaded the correct driver.
It found my tape backup devices, ata cdrom, and 2 da 18gig SCSI drives
without any problems.

I continued to install the kernel, ports, packages, etc.  The system is
running great with all devices configured!

I tried to build a custom kernel.  To disable drivers and clean up the
kernel, firewall, smp, etc.  Everything was going great until the SMP part.
As I mentioned above, the kernel halts, with no errors, it simply locks the
machine up while booting.  I tried even using the GENERIC kernel, which
enables a lot and works just fine.  Until I simply enable SMP support.

And example SMP setup I tried is (which seems to be what the system asks
for):
options SMP
options APIC_IO
options NCPU=2
options NBUS=4
options NAPIC=2
options NINTR=28

Yes, I tried disabling all but the first two lines.  The kernel would halt
immediately telling me I has more then 1 apic and I had to rebuild my kernel
(it numbered NAPIC=2 on the error).  It also reported back errors that I had
4 buses and to increase my NBUS=4 and that I had 28 intr and to increase
NINTR to 28.

Now, I haven't tried OVER SIZING any of the above.  I had to ship the
servers off today.  But I will be back working on them in a few days and
would love any advice.

Another odd story.  Just for argument sake, I compiled a 3.3-STABLE kernel
with SMP support with the params above, and the floppies loaded it correctly
enabling both CPU0 and CPU1 on boot.  Just no SCSI card/Harddrives were
found because of the 3.x problem of not detecting my SCSI board.  

So, I now have a 3.x kernel with SMP but no HD.  And a 4.0 kernel with HDs,
but no SMP support.

Yes, I tried changing all sorts of settings in the BIOS and Utility config.
Changing mem IOs, IRQs, disabling the second bus, etc etc etc.  I have been
up since 11am Sunday morning working on this.  I just NOW boxes them up.  I
haven't been to sleep yet.

HELP!  A $1,500 second CPU laying waste in this extremely fast system isn't
too good at all.


Thanks in advance,
Eric Duncan

eduncan@idealmusic.com


[-- Attachment #2 --]
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ORG:iDealmusic, Inc.
TITLE:Web Applications and System Manager
NOTE: 
TEL;WORK;VOICE:615-254-9008 x19
TEL;WORK;FAX:615-254-0260
ADR;WORK;ENCODING=QUOTED-PRINTABLE:;;One Church Street Building=0D=0ASuite 325;Nashville;TN;37201;United States=
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ed States of America
URL:
URL:http://www.iDealmusic.com
EMAIL;PREF;INTERNET:eduncan@iDealmusic.com
REV:20000314T230221Z
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