On Sun, Nov 23, 2014 at 12:33 PM, Christian Marie <christian@xxxxxxxxx> wrote: > Here's an update: > > Tried running 3.18.0-rc5 over the weekend to no avail. A load spike through > Ceph brings no perceived improvement over the chassis running 3.10 kernels. > > Here is a graph of *system* cpu time (not user), note that 3.18 was a005.block: > > http://ponies.io/raw/cluster.png > > It is perhaps faring a little better that those chassis running the 3.10 in > that it did not have min_free_kbytes raised to 2GB as the others did, instead > it was sitting around 90MB. > > The perf recording did look a little different. Not sure if this was just the > luck of the draw in how the fractal rendering works: > > http://ponies.io/raw/perf-3.10.png > > Any pointers on how we can track this down? There's at least three of us > following at this now so we should have plenty of area to test. Checked against 3.16 (3.17 hanged for an unrelated problem), the issue is presented for single- and two-headed systems as well. Ceph-users reported presence of the problem for 3.17, so probably we are facing generic compaction issue. -- 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>
