On Fri, 28 Sep 2007, Peter Zijlstra wrote: > memory got massively fragemented, as anti-frag gets easily defeated. > setting min_free_kbytes to 12M does seem to solve it - it forces 2 max > order blocks to stay available, so we don't mix types. however 12M on > 128M is rather a lot. Yes, strict ordering would be much better. On NUMA it may be possible to completely forbid merging. We can fall back to other nodes if necessary. 12M is not much on a NUMA system. But this shows that (unsurprisingly) we may have issues on systems with a small amounts of memory and we may not want to use higher orders on such systems. The case you got may be good to use as a testcase for the virtual fallback. Hmmmm... Maybe it is possible to allocate the stack as a virtual compound page. Got some script/code to produce that problem? - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
