Joel Liu's Library tagged varnish →  View Popular

What happens is this: Squid creates a HTTP object in "RAM" and it gets used some
times rapidly after creation. Then after some time it get no more hits and the
kernel notices this. Then somebody tries to get memory from the kernel for
something and the kernel decides to push those unused pages of memory out to
swap space and use the (cache-RAM) more sensibly for some data which is actually
used by a program. This however, is done without squid knowing about it. Squid
still thinks that these http objects are in RAM, and they will be, the very
second it tries to access them, but until then, the RAM is used for something
productive.