Posted Oct 18, 2009 19:41 UTC (Sun) by kleptog (subscriber, #1183)
Parent article: Fixing kmap_atomic()
I work with machines that have 8GB+ of memory but are only 32-bit builds. It seems to me that highmem would indeed cost something, but it's entirely unclear to me how much. How could you measure it?
I've been thinking of just installing a 64-bit kernel but leaving the userspace unchanged. ISTM this should cut out the cost of highmem. But I have no way of measuring any difference and I havn't found any place discussing this combination.