[openib-general] Low cost MBs compatible with Mellanox PCIE Cards

[Steve Welch]

Bob,

We do not have interrupt assignment problems for the HCA that I'm aware of
using the A8N32-SLI Deluxe MB.  We do have message signaled interrupts
enabled as well (Roland's suggestion to Jason).  Output follows.

Steve W.

<syslog at boot, int assignment for HCA> 

Feb 16 07:50:26 localhost kernel: ACPI: PCI interrupt 0000:07:00.0[A] -> GSI
17 (level, low) -> IRQ 225


<dump of interrupt assignments/counts>

[root at localhost ~]# cat /proc/interrupts
           CPU0
  0:   55263251    IO-APIC-edge  timer
  1:         16    IO-APIC-edge  i8042
  8:          0    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 12:        402    IO-APIC-edge  i8042
177:      10162   IO-APIC-level  libata
185:          0   IO-APIC-level  libata, ohci_hcd
193:    5559144   IO-APIC-level  ehci_hcd, eth0
201:          0   IO-APIC-level  NVidia CK804
209:   18286320   IO-APIC-level  xxxxxx
217:   19671760   IO-APIC-level  xxxxxx
225:   33752396   IO-APIC-level  InfiniHost_III_Lx0
NMI:       2101
LOC:   55255250
ERR:          0
MIS:          0





________________________________________
From: Bob Pearson [mailto:rpearson at systemfabricworks.com] 
Sent: Thursday, February 16, 2006 8:45 AM
To: 'Bill Boas'; openib-general at openib.org
Cc: 'Steve Welch'; 'Jim Mott'
Subject: RE: [openib-general] Low cost MBs compatible with Mellanox PCIE
Cards

Jim has worked with the A8N-SLI board. We have worked with a newer version
called A8N32-SLI Deluxe which has much better PCIe support. Ours has only
run the gen1 stack so I have no idea what it does with the gen2 stack. As
for the BIOS issue mentioned perhaps Steve W could take a look and see if
the comment from Jason makes any sense but my impression is that everything
was just fine.

________________________________________
From: Bill Boas [mailto:bill.boas at gmail.com] 
Sent: Wednesday, February 15, 2006 10:56 PM
To: Bob Pearson
Subject: Fwd: [openib-general] Low cost MBs compatible with Mellanox PCIE
Cards


Do we have something to contribute to this thread?
 

---------- Forwarded message ----------
From: Roland Dreier <rdreier at cisco.com>
Date: Feb 15, 2006 4:52 PM 
Subject: Re: [openib-general] Low cost MBs compatible with Mellanox PCIE
Cards
To: Jason Gunthorpe <jgunthorpe at obsidianresearch.com>
Cc: openib-general at openib.org

   Jason> Unfortunately the board's BIOS's ACPI tables are totally
   Jason> broken and the BIOS assigns every interrupt source in the
   Jason> system to IRQ 5 :< At least it does work in full APIC mode 
   Jason> which means it might be possible to get MSI working if the
   Jason> nvidia bridge isn't broken.

I've not seen any problems with MSI/MSI-X with nforce4 and PCIe HCAs
on both my Asus A8N-SLI and HP DL145G2 systems. 

Just building a kernel with CONFIG_PCI_MSI enabled might help, since
it changes the way the kernel numbers interrupts.

- R.
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