Hi! > > I understand that more RAM leaves less lowmem. What is unacceptable is > > that PAE crashes or freezes with OOM: it should gracefully handle the > > issue. Noting that (for a machine with 4GB or under) PAE fails where the > > HIGHMEM4G kernel succeeds and survives. > > You have found a delta, but you're not really making apples-to-apples > comparisons. The page tables (a huge consumer of lowmem in your bug > reports) have much more overhead on a PAE kernel. A process with a > single page faulted in with PAE will take at least 4 pagetable pages > (it's 7 in practice for me with sleeps). It's 2 pages minimum (and in > practice with sleeps) on HIGHMEM4G. > > There's probably a bug here. But, it's incredibly unlikely to be seen > in practice on anything resembling a modern system. The 'sleep' issue > is easily worked around by upgrading to a 64-bit kernel, or using Are you saying that HIGHMEM configuration with 4GB ram is not expected to work? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>