Hello. I just upgraded my ubuntu 10.10 amd64 (2.6.35) to 11.04 (2.6.38) and 14 hours after the upgrade, it oopsed related to nf_conntrak (I've sent an email to netdev about it). I don't know if it's related, but my page allocation failures have returned (I've had them quite a lot in the past) so I thought I'd report them again now that I'm running a newer kernel. 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:17:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Oct 1 22:45:19 ub kernel: [38857.002540] __alloc_pages_slowpath: 12 callbacks suppressed Oct 1 22:45:19 ub kernel: [38857.002545] swapper: page allocation failure. order:0, mode:0x4020 Oct 1 22:45:19 ub kernel: [38857.002551] Pid: 0, comm: swapper Tainted: G I 2.6.38-11-generic #50-Ubuntu Oct 1 22:45:19 ub kernel: [38857.002555] Call Trace: Oct 1 22:45:19 ub kernel: [38857.002558] [] ? __alloc_pages_nodemask+0x604/0x840 Oct 1 22:45:19 ub kernel: [38857.002577] [] ? alloc_pages_current+0xa5/0x110 Oct 1 22:45:19 ub kernel: [38857.002583] [] ? new_slab+0x282/0x290 Oct 1 22:45:19 ub kernel: [38857.002589] [] ? __slab_alloc+0x262/0x390 Oct 1 22:45:19 ub kernel: [38857.002597] [] ? __netdev_alloc_skb+0x24/0x50 Oct 1 22:45:19 ub kernel: [38857.002603] [] ? __kmalloc_node_track_caller+0x9b/0x1a0 Oct 1 22:45:19 ub kernel: [38857.002609] [] ? __netdev_alloc_skb+0x24/0x50 Oct 1 22:45:19 ub kernel: [38857.002615] [] ? __alloc_skb+0x83/0x170 Oct 1 22:45:19 ub kernel: [38857.002620] [] ? __netdev_alloc_skb+0x24/0x50 Please see attached file for all the page allocation failures I got yesterday. On 2.6.35, the failures seem to have been helped by "vm.min_free_kbytes=4096" but not anymore it seems. I just now changed it to 65536 just as a preventive measure. The machine has most just disk cache, actual program memory usage is very light: $ free total used free shared buffers cached Mem: 7992352 7866512 125840 0 160472 6785656 -/+ buffers/cache: 920384 7071968 Swap: 0 0 0 -- Mikael Abrahamsson email: swmike@swm.pp.se