On Thu 03-03-16 10:23:03, Jerry Lee wrote: > On 3 March 2016 at 01:36, Michal Hocko <mhocko@xxxxxxxxxx> wrote: > > > On Wed 02-03-16 14:20:38, Jerry Lee wrote: [...] > > > Is there anything I could do to totally get rid of the problem? > > > > I would try to sacrifice those few megs and get rid of zone normal > > completely. AFAIR mem=4G should limit the max_pfn to 4G so DMA32 should > > cover the shole memory. > > > > I came up with a patch that seem to work well on my system. But, I > am afraid that it breaks the rule that all zones must be balanced for > order-0 request and It may cause some other side-effect? I thought > that the patch is just a workaround (a bad one) and not a cure-all. One thing I haven't noticed previously is that you are running on the 3.12 kernel. I vaguely remember there were some fixes for small zones. Not sure it would work for such a small zone but it would be worth trying I guess. Could you retest with 4.4? -- Michal Hocko SUSE Labs -- 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>