Adding more memory = hugh cpu load

From: alexandre - aldeia digital <adaldeia(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Adding more memory = hugh cpu load
Date: 2011-10-10 13:26:44
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Yesterday, a customer increased the server memory from 16GB to 48GB.

Today, the load of the server hit 40 ~ 50 points.
With 16 GB, the load not surpasses 5 ~ 8 points.

The only parameter that I changed is effective_cache_size (from 14 GB to
40GB) and shared_buffers (from 1 GB to 5 GB). Setting the values back
does not take any effect.

This server use CentOS 5.5 ( - X86_64).
Should I change some vm parameters to this specific kernel ?

Thanks for any help.


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