| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Steve White <Stevan_White(at)hotmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #5397: powertop reports excessive wakeups |
| Date: | 2010-03-31 02:22:38 |
| Message-ID: | 20100331022238.GI3565@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
Steve White wrote:
> This is a Samsung NC20. The goal is to use this machine for occasional
> testing of a database, but to keep its power consumption minimal.
>
> Intel powertop reports the second biggest cause of wakeups (after the
> network device ath) is postgres:
>
> Top causes for wakeups
> 23.6% ( 11.7)D postgres
>
> This is with a cleanly installed database, not being accessed at all.
Try raising autovacuum_naptime (or disabling autovac altogether). There
are other background processes that wake up with some frequency; I think
bgwriter_delay and wal_writer_delay could be increased as well.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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