Harri Olin wrote:
..
Two marvell controllers, 16 disks, software raid10, IO stucks on
different disks, kernel 2.6.26.5.
With default ubuntu's 8.04 2.6.24 kernel the problem can not be
repeated
[ 289.851609] ata11.00: exception Emask 0x0 SAct 0x1 SErr 0x0
action 0x6 frozen
[ 289.851695] ata11.00: cmd 61/08:00:60:1e:bf/00:00:01:00:00/40
tag 0 ncq 4096 out
[ 289.851697] res 40/00:00:00:00:00/00:00:00:00:00/00
Emask 0x4 (timeout)
[ 289.851774] ata11.00: status: { DRDY }
[ 289.851834] ata11: hard resetting link
[ 290.649259] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl
300)
[ 290.749239] ata11.00: max_sectors limited to 256 for NCQ
[ 290.809189] ata11.00: max_sectors limited to 256 for NCQ
[ 290.809194] ata11.00: configured for UDMA/133
[ 290.809200] ata11: EH complete
[ 290.809242] sd 10:0:0:0: [sdk] 1953525168 512-byte hardware
sectors (1000205 MB)
[ 290.809258] sd 10:0:0:0: [sdk] Write Protect is off
[ 290.809263] sd 10:0:0:0: [sdk] Mode Sense: 00 3a 00 00
[ 290.809286] sd 10:0:0:0: [sdk] Write cache: enabled, read
cache: enabled, doesn't support DPO or FUA
..
I have to take back that bisect, as just couple of minutes ago it
happened again, with last 'good' kernel from bisect. Just the frequency
of stalls has dropped quite much. I also noticed that on current kernels
are much better too.
pre-..0ff7efa8c: only once after 6 hours of testing
post-..0ff7efa8c: one hd stalled while filesystem was mounting. Before
boot was complete, 3 stalls. Also at shutdown kernel hung at
Synchronizing SCSI cache for a while.
2.6.27: once in 5 minutes or so on heavy load
When some hd/port stalls, other ports sill work fine.
I applied your patch on 2.6.27.1, no results:
ata14.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
ata14.00: cmd 61/08:00:3f:52:54/00:00:57:00:00/40 tag 0 ncq 4096 out
res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
..
Yeah, I see what I was missing earlier: "(timeout)".
So it's "none of" the driver paths.
This could very well be due to one/several of the as-yet un-addressed
chipset errata for the 6081. Someday we'll have software workarounds
for those, but I'm (still) waiting on Marvell for stuff.
I will look and see if this makes sense based on the errata info
that I have already though (under NDA).
Harri / Artem: what type/speed of slots are your 6081 controllers in?
PCI, or PCI-X? Bus speed?
Thanks
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