Differences

This shows you the differences between two versions of the page.

--- armsuperpages [2013/07/16 20:53] – ZbigniewBodek
+++ armsuperpages [2020/05/18 02:48] (current) – this is a historical page. MarkLinimon
@@ Line 1: / Line 1: @@
 ====== FreeBSD/arm Superpages for ARMv7 ======
+:!: this is a historical page.
 ==== Engineer ====
@@ Line 37: / Line 39: @@
 | M1 | Clean-ups of pmap-v6.c module | **100%** |
-| M2 | Initial implementation of superpages on ARM | **70%** |
+| M2 | Initial implementation of superpages on ARM | **100%** |
-| M3 | Performance measurements, testing, documentation | **0%** |
+| M3 | Performance measurements, testing, documentation | **100%** |
-| M4 | Final integration with the %%FreeBSD%% source repo | **50%** |
+| M4 | Final integration with the %%FreeBSD%% source repo | **100%** |
 === Clean-ups of pmap-v6.c module ===
@@ Line 63: / Line 65: @@
     * PV entry management for superpages
   * Enable generic, reservation based allocation
-//Ongoing tasks://
   * Bring-up of the functionality
   * Adjust pmap-v6 infrastructure to utilize superpages' mechanisms
-  * Fix bugs
-----
+===== Performance measurements and testing =====
-===== Repository =====
+  * Currently pmap-v6 is suffering from the demotion problem caused by the continuous active queue scanning in VM.\\ Due to that all tests were performed with vm.pageout_update_period set to the number greater than available pages in the system. This effectively disables the actively queue scanning.
-[[https://github.com/semihalf-bodek-zbigniew/freebsd-arm-superpages.git|GitHub Link]]
+**GUPS benchmark**
-Currently there are two active branches in the repository.
+GUPS (Giga Updates Per Second) measures how frequently system can issue updates to randomly generated memory locations.
-In order to view commits on the desired branch, one has to switch to it using **//branch//** drop-down list.
+In particular GUPS measures both memory latency and bandwidth capabilities.
-**Branches:**
+| Test | CPU Time used [s] | Real time used [s] | Updates per second [bn/s] | SP support |
+| 1 | 146,421875 | 146,420915 | 0,003666627 | **Disabled** |
+| 2 | 146,476562 | 146,476513 | 0,003665235 | **Disabled** |
+| 3 | 146,398438 | 146,396621 | 0,003667236 | **Disabled** |
+| 4 | 146,695312 | 146,699617 | 0,003659661 | **Disabled** |
+| 5 | 96,453125 | 96,450370 | 0,005566292 | **Enabled** |
+| 6 | 96,429688 | 96,426973 | 0,005567643 | **Enabled** |
+| 7 | 96,953125 | 96,948327 | 0,005537702 | **Enabled** |
+| 8 | 96,421875 | 96,423033 | 0,005567870 | **Enabled** |
+| Improvement | 34% | 34% | 52% |
-  * **armsp-dev**
+**LMbench**
-    * most recent changes that are being tested at the moment
-  * **armsp**
+LMbench is a popular suite of system performance benchmarks.
-    * main project's branch
+Memory bandwidth and latency tests can be used for the purpose of //superpages// verification.
+LMbench uses STREAM testing program to examine memory performance.
+Results are differentiated by type of operation.
+| Mmap reread [MB/s] | Bcopy (libc) [MB/s] | Bcopy (hand) [MB/s] | Mem read [MB/s] | Mem write [MB/s] | Mem latency [ns] | SP support |
+| 645,4 | 305,4 | 432,3 | 681 | 3043 | 238,8 | **Disabled** |
+| 660,0 | 312,4 | 446,9 | 696 | 3300 | 148,4 | **Enabled** |
+| Improvement ||||||
+| 2,26% | 2,29% | 3,37% | 2,2% | 8,44 % | 37,85% |
+**Self host world build**
+Reduction in the duration of self hosted world build can be observed when using GCC.
+No time reduction can be observed when using CLANG despite creation of ~570000 superpages in the process.
+| GCC | CLANG | SP support |
+| 6h 36min | 6h 16min | **Disabled** |
+| 5h 14min | 6h 15min | **Enabled** |
+----
+===== Repository =====
+The code has been integrated to the %%FreeBSD%% HEAD.
+[[http://svnweb.freebsd.org/base?view=revision&revision=254918|Superpages support SVN Revision]]
 ===== References/Links =====
@@ Line 90: / Line 126: @@
 Practical, transparent operating system support for superpages
 [[http://static.usenix.org/events/osdi02/tech/full_papers/navarro/navarro.pdf|PAPER]]
+----
+{{tag>Historical}}