From: Anton Blanchard <an...@samba.org> Date: Thu, 26 Feb 2009 22:24:32 +1100
> On PowerPC we allocate large boot time hashes on node 0. This leads to > an imbalance in the free memory, for example on a 64GB box (4 x 16GB > nodes): > > Free memory: > Node 0: 97.03% > Node 1: 98.54% > Node 2: 98.42% > Node 3: 98.53% > > If we switch to using vmalloc (like ia64 and x86-64) things are more > balanced: > > Free memory: > Node 0: 97.53% > Node 1: 98.35% > Node 2: 98.33% > Node 3: 98.33% > > For many HPC applications we are limited by the free available memory on > the smallest node, so even though the same amount of memory is used the > better balancing helps. > > Since all 64bit NUMA capable architectures should have sufficient > vmalloc space, it makes sense to enable it via CONFIG_64BIT. > > Signed-off-by: Anton Blanchard <an...@samba.org> Acked-by: David S. Miller <da...@davemloft.net> _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
