Re: High load average on disk I/O on 2.6.17-rc3

[Nick Piggin]

Arjan van de Ven wrote:

> > ... except that any kernel < 2.6 didn't account tasks waiting for disk
> > IO.
>
> they did. It was "D" state, which counted into load average.

Perhaps kernel threads in D state should not contribute toward load avg.

Userspace does not care whether there are 2 or 20 pdflush threads waiting
for IO. However, when the network/disks can no longer keep up, userspace
processes will end up going to sleep in writeback or reclaim -- *that* is
when we start feeling the load.

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