[LinuxBIOS] DK8-HTX: 8131 A-bus running slow
mcqmcqmcq at fastmail.fm
mcqmcqmcq at fastmail.fm
Fri Feb 2 21:53:52 CET 2007
Guys,
Once my DK8-HTX is up and running in Linux, I observe that the 8131 is
programmed thusly (full regdump and my cute little utility attached):
/proc/bus/pci/00/0b.0: AMD 8131 PCI-X Tunnel PCI-X Bridge
0x40 PCI-X Miscellaneous Register
1-1 Conentional PCI mode frequency RW 0 0 33 MHz
0xa0 PCI-X Secondary Status Register
24-22 Secondary clock frequency R 0 3 133 MHz PCI-X
/proc/bus/pci/00/0a.0: AMD 8131 PCI-X Tunnel PCI-X Bridge
0x40 PCI-X Miscellaneous Register
1-1 Conentional PCI mode frequency RW 0 1 66 Mhz
0xa0 PCI-X Secondary Status Register
24-22 Secondary clock frequency R 0 0 conventional PCI
In particular, the A-bus 0a.0 is massively horribly slow (50MB/s to my RAID
card as opposed to 350MB/s in the 0b.0 slot). I only see one speed line during
LB bootup and would expect two (one for each bus):
Capability: 0x07 @ 0xa0
PCI: 03: 133MHz PCI-X
So my theory is that the A-bus is just never getting configued at all (nobody
who uses LB does I/O, right? ;-). Can anybody confirm or deny this theory, and
possibly point me toward what I might do to fix it?
As an aside, I'm still working from the r2520 I was ages ago. YH, you were once
going to look into repeating the hangs I was seeing with a Pathscale HTX IB card
installed (during HT reset in iwill/dk8_htx/cache_as_ram_auto.c) -- did that ever
go anywhere? Once I get this sucker fully tested, I'll summarize what I've done
to get it there and compare to svn head for you guys' continued entertainment.
Thanks, y'all,
-mcq
--
mcqmcqmcq at fastmail.fm
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