On Tue, 21 Jul 2015 08:50:36 -0500 (CDT) Christoph Lameter <cl@xxxxxxxxx> wrote: > On Mon, 20 Jul 2015, Jesper Dangaard Brouer wrote: > > > Yes, I think it is merged... how do I turn off merging? > > linux/Documentation/kernel-parameters.txt > > slab_nomerge [MM] > Disable merging of slabs with similar size. May be > necessary if there is some reason to distinguish > allocs to different slabs. Debug options disable > merging on their own. > For more information see Documentation/vm/slub.txt. I was hoping I could define this per slub runtime. Any chance this would be made possible? Setting boot param "slab_nomerge" made my benchmarking VERY stable between runs (obj size 256). Run01: slab_nomerge 1 - 63 cycles(tsc) 15.927 ns - 46 cycles(tsc) 11.707 ns 2 - 56 cycles(tsc) 14.185 ns - 28 cycles(tsc) 7.129 ns 3 - 54 cycles(tsc) 13.588 ns - 23 cycles(tsc) 5.762 ns 4 - 53 cycles(tsc) 13.291 ns - 20 cycles(tsc) 5.085 ns 8 - 51 cycles(tsc) 12.918 ns - 19 cycles(tsc) 4.886 ns 16 - 50 cycles(tsc) 12.607 ns - 19 cycles(tsc) 4.858 ns 30 - 51 cycles(tsc) 12.759 ns - 19 cycles(tsc) 4.980 ns 32 - 51 cycles(tsc) 12.930 ns - 19 cycles(tsc) 4.975 ns 34 - 93 cycles(tsc) 23.410 ns - 27 cycles(tsc) 6.924 ns 48 - 80 cycles(tsc) 20.193 ns - 25 cycles(tsc) 6.279 ns 64 - 73 cycles(tsc) 18.322 ns - 23 cycles(tsc) 5.939 ns 128 - 88 cycles(tsc) 22.083 ns - 29 cycles(tsc) 7.413 ns 158 - 97 cycles(tsc) 24.274 ns - 34 cycles(tsc) 8.696 ns 250 - 102 cycles(tsc) 25.556 ns - 40 cycles(tsc) 10.100 ns Run02: slab_nomerge 1 - 63 cycles(tsc) 15.879 ns - 46 cycles(tsc) 11.701 ns 2 - 56 cycles(tsc) 14.222 ns - 28 cycles(tsc) 7.140 ns 3 - 54 cycles(tsc) 13.586 ns - 23 cycles(tsc) 5.783 ns 4 - 53 cycles(tsc) 13.339 ns - 20 cycles(tsc) 5.095 ns 8 - 51 cycles(tsc) 12.899 ns - 19 cycles(tsc) 4.905 ns 16 - 50 cycles(tsc) 12.624 ns - 19 cycles(tsc) 4.853 ns 30 - 51 cycles(tsc) 12.781 ns - 19 cycles(tsc) 4.984 ns 32 - 51 cycles(tsc) 12.933 ns - 19 cycles(tsc) 4.997 ns 34 - 93 cycles(tsc) 23.421 ns - 27 cycles(tsc) 6.909 ns 48 - 80 cycles(tsc) 20.241 ns - 25 cycles(tsc) 6.267 ns 64 - 73 cycles(tsc) 18.346 ns - 23 cycles(tsc) 5.947 ns 128 - 88 cycles(tsc) 22.192 ns - 29 cycles(tsc) 7.415 ns 158 - 97 cycles(tsc) 24.358 ns - 34 cycles(tsc) 8.693 ns 250 - 102 cycles(tsc) 25.597 ns - 40 cycles(tsc) 10.144 ns Run03: slab_nomerge 1 - 63 cycles(tsc) 15.897 ns - 46 cycles(tsc) 11.685 ns 2 - 56 cycles(tsc) 14.178 ns - 28 cycles(tsc) 7.132 ns 3 - 54 cycles(tsc) 13.590 ns - 23 cycles(tsc) 5.774 ns 4 - 53 cycles(tsc) 13.314 ns - 20 cycles(tsc) 5.092 ns 8 - 51 cycles(tsc) 12.872 ns - 19 cycles(tsc) 4.886 ns 16 - 50 cycles(tsc) 12.603 ns - 19 cycles(tsc) 4.840 ns 30 - 50 cycles(tsc) 12.750 ns - 19 cycles(tsc) 4.966 ns 32 - 51 cycles(tsc) 12.910 ns - 19 cycles(tsc) 4.977 ns 34 - 93 cycles(tsc) 23.372 ns - 27 cycles(tsc) 6.929 ns 48 - 80 cycles(tsc) 20.205 ns - 25 cycles(tsc) 6.276 ns 64 - 73 cycles(tsc) 18.292 ns - 23 cycles(tsc) 5.929 ns 128 - 90 cycles(tsc) 22.516 ns - 29 cycles(tsc) 7.425 ns 158 - 99 cycles(tsc) 24.825 ns - 34 cycles(tsc) 8.668 ns 250 - 102 cycles(tsc) 25.652 ns - 40 cycles(tsc) 10.129 ns -- 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>