On Mon, 2010-11-01 at 19:48 +0530, Tharindu Rukshan Bamunuarachchi wrote: > Tim, > > I found that default value for "zone_reclaim_mode" is zero in HP > machine. But It is one in IBM. > Why does it set 1 or 0 in different hardware Because the SLIT on the IBM platform has distances > 20. Looks like IBM is populating the SLIT on those platforms with "real" values. The HP bios is not supplying a slit, letting the remote distances default to 20. That is the threshold for setting zone_reclaim_mode. A patch was submitted recently to bump the threshold to ~30. Now that vendors are starting to populate the SLIT with values > 20, we've begun to see the behavior that you experienced. Regards, Lee > > On Sat, Oct 30, 2010 at 1:22 AM, Tim Pepper <lnxninja@xxxxxxxxxxxxxxxxxx> wrote: > > > > It would be interesting to see the output of "numactl --hardware" for each > > of these scenarios. > > > > 1. SLES11 + IBM HW > After consuming all memory in node1, it shows following ... > > available: 2 nodes (0-1) > node 0 cpus: 0 1 2 3 4 5 > node 0 size: 24564 MB > node 0 free: 23025 MB > node 1 cpus: 6 7 8 9 10 11 > node 1 size: 24576 MB > node 1 free: 16 MB > node distances: > node 0 1 > 0: 10 21 > 1: 21 10 > > > 2. SLES 11 + HP > > available: 2 nodes (0-1) > node 0 cpus: 0 2 4 6 > node 0 size: 24565 MB > node 0 free: 19929 MB > node 1 cpus: 1 3 5 7 > node 1 size: 24575 MB > node 1 free: 3043 MB > node distances: > node 0 1 > 0: 10 20 > 1: 20 10 > > available: 2 nodes (0-1) > node 0 cpus: 0 2 4 6 > node 0 size: 24565 MB > node 0 free: 19912 MB > node 1 cpus: 1 3 5 7 > node 1 size: 24575 MB > node 1 free: 335 MB > node distances: > node 0 1 > 0: 10 20 > 1: 20 10 > > available: 2 nodes (0-1) > node 0 cpus: 0 2 4 6 > node 0 size: 24565 MB > node 0 free: 17066 MB > node 1 cpus: 1 3 5 7 > node 1 size: 24575 MB > node 1 free: 16 MB > node distances: > node 0 1 > 0: 10 20 > 1: 20 10 > > available: 2 nodes (0-1) > node 0 cpus: 0 2 4 6 > node 0 size: 24565 MB > node 0 free: 10468 MB > node 1 cpus: 1 3 5 7 > node 1 size: 24575 MB > node 1 free: 16 MB > node distances: > node 0 1 > 0: 10 20 > 1: 20 10 > > > > > -- > > Tim Pepper <lnxninja@xxxxxxxxxxxxxxxxxx> > > IBM Linux Technology Center > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-numa" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-numa" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
