On Wed, Nov 03, 2010 at 01:33:47PM +0100, Andi Kleen wrote: > Traditionally stacking didn't work very > well in the kernel due to the limited kernel stack overflows. > I don't think that's significantly different here. Stacking in dm works reasonably well today and many people rely upon that. > Anyways stacking could be probably fixed, but it's also that 99.999999% Please fix this regression the patch causes then or give some fundamental arguments why we can't satisfy the two requirements simultaneously: I just don't understand why it is necessary to cause a regression in stacking/low memory support in order to provide the performance boost in the way you desire. The two things ought to be independent of each other. (And I remain sceptical about the suitability of the patch even with a stack of just two or three layers as I don't see anything in the failed tests that shows why similar failures couldn't in principle affect people with thinner stacks. The compromise I suggested was to amend the patch to introduce the change only for non-stacked devices.) Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
