using compression with Memcache PHP API

[Erik Schultink]

We're using the Memcache::setCompressThreshold() to compress values -
but I don't have a good sense of the best way to tune the $threshold
and $min_saving parameters. Does anyone have experience/insight about
good values to use or a methodology for determining them? Obviously,
we're willing to trade a reasonable amount of CPU cycles on our PHP
servers for better network performance.

As far as workload, most of our values are PHP arrays for which
compression should provide fair savings (no JPG images or anything
like that).