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0e1f616
(Get the code!)
FYI,
we've been running with the 2.6.37 release candidate kernel for some time now.
It seems to be stable (no issues so far with 8 x 2TB RAID-6 (mdadm)). It's slow as hell though. We get about 60MB/s write (sequential) on average. It sometimes peaks to ~300MB/s for a short period. In the beginning of the disks 8 disk 2TB RAID-6 should *easily* sustain 400MB/s+.
It must be something with internal scheduling, as I can start writes to all 8 of them simultaneous (dd if=/dev/zero of=/dev/sdX bs=4M) and get around 105MB/s (in the beginning, write speeds of course deteriorate as the radius on the platters gets smaller) on each of them (thus ~800MB/s sum). CPU isn't heavily loaded on the RAID-6 so I doubt it's anything with checksum calculation or similar.
Hopefully these issues will get resolved in a future release. Stability is more important and that seems to be resolved now. Not sure what in the 2.6.37 kernel has fixed it though, so can't really help indicating what should be backported if anything.