On Tue, 8 Sep 2015 10:22:32 -0500 (CDT) Christoph Lameter <cl@xxxxxxxxx> wrote: > On Tue, 8 Sep 2015, Jesper Dangaard Brouer wrote: > > > Also notice how well bulking maintains the performance when the bulk > > size increases (which is a soar spot for the slub allocator). > > Well you are not actually completing the free action in SLAB. This is > simply queueing the item to be freed later. Also was this test done on a > NUMA system? Alien caches at some point come into the picture. This test was a single CPU benchmark with no congestion or concurrency. But the code was compiled with CONFIG_NUMA=y. I don't know the slAb code very well, but the kmem_cache_node->list_lock looks like a scalability issue. I guess that is what you are referring to ;-) -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer -- 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>