>> This is poor design on Linux's part, since even the distant RAM is
>> faster than disk. For now, we've been disabling zone_reclaim entirely.
>
> I haven't run into this, but we were running ubuntu 10.04 LTS. What
> kernel were you running when this happened? I'd love to see a test
> case on this, as it seems like a major regression if it's on newer
> kernels, and we're looking at running 12.04 LTS soon on one of our
> bigger machines.
Jeff Frost will have a blog up about it later; we're still collecting data.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com