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authorDavid S. Miller <davem@davemloft.net>2017-08-10 14:59:18 -0700
committerDavid S. Miller <davem@davemloft.net>2017-08-10 14:59:18 -0700
commitfa5dc772e32e5c4945760f44adc7c7ee89b3475b (patch)
tree252bf2b8dc79a6a9b6a6d0b4d3d17953b0a73111 /arch/sparc/configs
parentsparc64: update comments in U3memcpy (diff)
parentarch/sparc: Add accurate exception reporting in M7memcpy (diff)
downloadlinux-dev-fa5dc772e32e5c4945760f44adc7c7ee89b3475b.tar.xz
linux-dev-fa5dc772e32e5c4945760f44adc7c7ee89b3475b.zip
Merge branch 'sparc64-M7-memcpy'
Babu Moger says: ==================== sparc64: Update memcpy, memset etc. for M7/M8 architectures This series of patches updates the memcpy, memset, copy_to_user, copy_from_user etc for SPARC M7/M8 architecture. New algorithm here takes advantage of the M7/M8 block init store ASIs, with much more optimized way to improve the performance. More detail are in code comments. Tested and compared the latency measured in ticks(NG4memcpy vs new M7memcpy). 1. Memset numbers(Aligned memset) No.of bytes NG4memset M7memset Delta ((B-A)/A)*100 (Avg.Ticks A) (Avg.Ticks B) (latency reduction) 3 77 25 -67.53 7 43 33 -23.25 32 72 68 -5.55 128 164 44 -73.17 256 335 68 -79.70 512 511 220 -56.94 1024 1552 627 -59.60 2048 3515 1322 -62.38 4096 6303 2472 -60.78 8192 13118 4867 -62.89 16384 26206 10371 -60.42 32768 52501 18569 -64.63 65536 100219 35899 -64.17 2. Memcpy numbers(Aligned memcpy) No.of bytes NG4memcpy M7memcpy Delta ((B-A)/A)*100 (Avg.Ticks A) (Avg.Ticks B) (latency reduction) 3 20 19 -5 7 29 27 -6.89 32 30 28 -6.66 128 89 69 -22.47 256 142 143 0.70 512 341 283 -17.00 1024 1588 655 -58.75 2048 3553 1357 -61.80 4096 7218 2590 -64.11 8192 13701 5231 -61.82 16384 28304 10716 -62.13 32768 56516 22995 -59.31 65536 115443 50840 -55.96 3. Memset numbers(un-aligned memset) No.of bytes NG4memset M7memset Delta ((B-A)/A)*100 (Avg.Ticks A) (Avg.Ticks B) (latency reduction) 3 40 31 -22.5 7 52 29 -44.2307692308 32 89 86 -3.3707865169 128 201 74 -63.184079602 256 340 154 -54.7058823529 512 961 335 -65.1404786681 1024 1799 686 -61.8677042802 2048 3575 1260 -64.7552447552 4096 6560 2627 -59.9542682927 8192 13161 6018 -54.273991338 16384 26465 10439 -60.5554505951 32768 52119 18649 -64.2184232238 65536 101593 35724 -64.8361599717 4. Memcpy numbers(un-aligned memcpy) No.of bytes NG4memcpy M7memcpy Delta ((B-A)/A)*100 (Avg.Ticks A) (Avg.Ticks B) (latency reduction) 3 26 19 -26.9230769231 7 48 45 -6.25 32 52 49 -5.7692307692 128 284 334 17.6056338028 256 430 482 12.0930232558 512 646 690 6.8111455108 1024 1051 1016 -3.3301617507 2048 1787 1818 1.7347509793 4096 3309 3376 2.0247809006 8192 8151 7444 -8.673782358 16384 34222 34556 0.9759803635 32768 87851 95044 8.1877269468 65536 158331 159572 0.7838010244 There is not much difference in numbers with Un-aligned copies between NG4memcpy and M7memcpy because they both mostly use the same algorithems. v2: 1. Fixed indentation issues found by David Miller 2. Used ENTRY and ENDPROC for the labels in M7patch.S as suggested by David Miller 3. Now M8 also will use M7memcpy. Also tested on M8 config. 4. These patches are created on top of below M8 patches https://patchwork.ozlabs.org/patch/792661/ https://patchwork.ozlabs.org/patch/792662/ However, I did not see these patches in sparc-next tree. It may be in queue now. It is possible these patches might cause some build problems. It will resolve once all M8 patches are in sparc-next tree. v0: Initial version ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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