On Thu, 1 Jun 2006, Kris Kennaway wrote: > On Fri, Jun 02, 2006 at 12:35:27AM +0300, Giorgos Keramidas wrote: > >>> I think it should be the default. I think we should also avoid using -M >>> (malloc backing for md) in favour of swap backing because of the panic >>> problems - this is too easy to trigger by accident and it makes FreeBSD >>> look bad since it looks like a bug. >> >> Ok, I'll prepare a patch that enables async and disables -M. We should >> also document the fact that tmpmfs="YES" and varmfs="YES" in rc.conf may >> require the presence of at least one swap device by default, and point the >> users to -M with a warning if they run FreeBSD without a swap device but >> still want to use tmpmfs or varmfs :) > > Actually I thought about this and don't think it's the case. swap backing > doesn't use swap unless you have memory pressure, and if you have memory > pressure and no swap your system is going to explode regardless. My feeling is that swap-backed md should have been the default years ago. We could add a sanity test to mdconfig that generates a warning if swap-backed md is configured but swapping isn't configured. Robert N M WatsonReceived on Fri Jun 02 2006 - 05:55:16 UTC
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