Date: Sat, 16 Jun 2001 10:12:16 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: "Justin T. Gibbs" <gibbs@scsiguy.com> Cc: freebsd-stable@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: Another SCB timeout lockup - this time with console logs! Message-ID: <200106161712.f5GHCGE01537@earth.backplane.com> References: <200106161632.f5GGWbU04297@aslan.scsiguy.com>
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:
:> Ok, it happened again. ahc0 and fxp0 both went poof and started
:> looping on timeouts. Here is the console log. I included a bunch
:> of the repetitions. It repeats forever (I have another 15000 lines I
:> didn't include).
:
:From what I can tell, the aic7xxx card is sitting in a loop waiting
:for its DMA of the next transaction to complete. The fxp driver seems
:to have similar problems with burst transfers at the same time. My guess
:would be that the chipset gets wedged somehow, but without chipset
:information from ServerWorks, this is going to be a tough nut to crack.
:Having a PCI bus analyzer might help as well, assuming there is a slot
:on either the bus fxp0 or ahc0 is sitting on.
:
:--
:Justin
I don't know how typical that would be, but it seems unlikely that
the motherboard chipsets would be shared with a PCI slot.
Hmm, interesting. I just compared the dmesg.run for our DELL 2400 and
one of our DELL 2450's & 2550's. On all of them the on-board adaptec
controller is bridged off the pci bus that fxp0 is sitting on.
This problem has only occured on the 2400, though, and the 2400 and 2450
seems to be using the same ServerWorks chipsets. Odd. I am going to try
working around it by disabling the on-board fxp0 and throwing another
PCI ethernet card into the box. Then the two busiest devices will be
routing through different PCI busses.
DELL2400:
pcib0 on motherboard
fxp0
pcib1 is device 2.0 on pci0
ahc0 (drives here)
ahc1 (cdrom)
pcib2 on motherboard
fxp1 (pci card)
fxp2 (pci card)
DELL2450:
pcib0 on motherboard
ahc0 ?
pcib1 on motherboard
fxp0
pcib2 device 2.0 on pci1
ahc1 (drives here)
ahc2
DELL2550:
pcib0 on motherboard
motherboard gfx
pcib1 on motherboard
pcib2 on motherboard
fxp0
pcib3 on motherboard
pcib4 device 2.0 on pci2
ahc0 (drives here)
ahc1
-Matt
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