2009/10/11 Steinar H. Gunderson [off-list ref]:

Hello,

I've just upgraded from 2.6.31-rc8 to 2.6.32-rc3, and I thought I would turn
on the new multicore RAID-5 processing. I did, it booted up and started
syncing RAIDs (since the last shutdown before that was not clean), and
started syncing at the minimum speed (1000 K/sec). I've seen this before, so
I upped it in /proc to about 100MB/sec minimum (which is well below what I've
seen from that RAID; six 7200rpm SATA drives connected by SAS).

However, it never wanted to go above about 8-10MB/sec, and md4_raid5 used
100% CPU while I/O was extremely slow. Suddenly the serial console flashed:

< snip >

Hi,

I'm not savvy enough to read traces, but on surface it looks similar
to a problem described in a thread started on the linux-raid list by
Holger Kiehl on Oct. 16. (Raid reconstructing and process hanging in D
state).

Hope it helps.

Regards,
Paweł
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