I'm having this problem right now. We run a squidproxy for about 1500 clients, a smp machine with approx 4 gigs of ram. Someone suggested I tried out Rik's rmap patch and that's what I'm doing right now.
The problem I'm experiencing occationally is a complete lockup, kswapd eating *all* cpu on the machine, it becomes unusable, locked down to ssh and everything for 10-15 minutes then it starts running again as usual.
I've been using the rmap patch for 3 days now, and so far, we haven't experienced this problem - it might show up, takes a while after a reboot until it hits. We'll see. But I still have some faith in it.
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