getblk was holding the lru_list_lock lock 86% of the time.
Was averaging about 25,000 blocks/sec to the disks (vmstat),
but it was often 200,000 over 2 seconds, then 5 seconds idle,
etc. Disk lights didn't come on much (but they all blinked
nicely in sync).
I'll try your patch out and run individual disks again.
Kevin
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