> Basically, I'm seeing very poor i/o performance (c8
> is the on-board, c11 is one of the 3 PCIe cards):
>
> r...@nas2:/# dd if=/dev/rdsk/c8t0d0s0 of=/dev/null bs=65536 count=16384
...
> And the associated iostat:
> tin tout us sy wt id
> 0 54 0 81 0 19
Seems to use an excessive amount of kernel
cpu time (80 - 90%). Did you already had a look
at a kernel profile to find out who is consuming
all that cpu cycles in the kernel?
lockstat -kIW -D 20 dd if=/dev/rdsk/c8t0d0s0 of=/dev/null bs=65536
count=16384
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