Messages in this thread | | | Date | Tue, 09 May 2006 11:57:40 +1000 | From | Nick Piggin <> | Subject | Re: High load average on disk I/O on 2.6.17-rc3 |
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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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