Varnish memory usage

[Michael Lenaghan]

Hello, all. Just thought I'd share our results:

 * With "malloc,512M" Varnish seemed to stabilize at ~935 MB virtual memory.

 * With "malloc,850M" Varnish seemed to stabilize at ~1,330 MB virtual memory.

 * With "malloc,1G" Varnish seemed to stabilize at ~1,630 MB virtual memory.

No doubt all of this is sensitive to our test patterns, etc. Still,
might be useful.

Thanks again, Ken.