The PPC 440 support has been removed in commit 98f705c9ce ("powerpc: remove 4xx support") already, so this file is certainly not required anymore.

Signed-off-by: Thomas Huth thuth@redhat.com --- doc/README.440-DDR-performance | 90 ---------------------------------- 1 file changed, 90 deletions(-) delete mode 100644 doc/README.440-DDR-performance

diff --git a/doc/README.440-DDR-performance b/doc/README.440-DDR-performance deleted file mode 100644 index 66b97bc9b5..0000000000 --- a/doc/README.440-DDR-performance +++ /dev/null @@ -1,90 +0,0 @@ -AMCC suggested to set the PMU bit to 0 for best performace on the -PPC440 DDR controller. The 440er common DDR setup files (sdram.c & -spd_sdram.c) are changed accordingly. So all 440er boards using -these setup routines will automatically receive this performance -increase. - -Please see below some benchmarks done by AMCC to demonstrate this -performance changes: - - ----------------------------------------- -SDRAM0_CFG0[PMU] = 1 (U-Boot default for Bamboo, Yosemite and Yellowstone) ----------------------------------------- -Stream benchmark results -------------------------------------------------------------- -This system uses 8 bytes per DOUBLE PRECISION word. -------------------------------------------------------------- -Array size = 2000000, Offset = 0 -Total memory required = 45.8 MB. -Each test is run 10 times, but only -the *best* time for each is used. -------------------------------------------------------------- -Your clock granularity/precision appears to be 1 microseconds. -Each test below will take on the order of 112345 microseconds. - (= 112345 clock ticks) -Increase the size of the arrays if this shows that you are not getting -at least 20 clock ticks per test. -------------------------------------------------------------- -WARNING -- The above is only a rough guideline. -For best results, please be sure you know the precision of your system -timer. -------------------------------------------------------------- -Function Rate (MB/s) RMS time Min time Max time -Copy: 256.7683 0.1248 0.1246 0.1250 -Scale: 246.0157 0.1302 0.1301 0.1302 -Add: 255.0316 0.1883 0.1882 0.1885 -Triad: 253.1245 0.1897 0.1896 0.1899 - - -TTCP Benchmark Results -ttcp-t: socket -ttcp-t: connect -ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5000 tcp -> -localhost -ttcp-t: 16777216 bytes in 0.28 real seconds = 454.29 Mbit/sec +++ -ttcp-t: 2048 I/O calls, msec/call = 0.14, calls/sec = 7268.57 -ttcp-t: 0.0user 0.1sys 0:00real 60% 0i+0d 0maxrss 0+2pf 3+1506csw - ----------------------------------------- -SDRAM0_CFG0[PMU] = 0 (Suggested modification) -Setting PMU = 0 provides a noticeable performance improvement *2% to -5% improvement in memory performance. -*Improves the Mbit/sec for TTCP benchmark by almost 76%. ----------------------------------------- -Stream benchmark results -------------------------------------------------------------- -This system uses 8 bytes per DOUBLE PRECISION word. -------------------------------------------------------------- -Array size = 2000000, Offset = 0 -Total memory required = 45.8 MB. -Each test is run 10 times, but only -the *best* time for each is used. -------------------------------------------------------------- -Your clock granularity/precision appears to be 1 microseconds. -Each test below will take on the order of 120066 microseconds. - (= 120066 clock ticks) -Increase the size of the arrays if this shows that you are not getting -at least 20 clock ticks per test. -------------------------------------------------------------- -WARNING -- The above is only a rough guideline. -For best results, please be sure you know the precision of your system -timer. -------------------------------------------------------------- -Function Rate (MB/s) RMS time Min time Max time -Copy: 262.5167 0.1221 0.1219 0.1223 -Scale: 258.4856 0.1238 0.1238 0.1240 -Add: 262.5404 0.1829 0.1828 0.1831 -Triad: 266.8594 0.1800 0.1799 0.1802 - -TTCP Benchmark Results -ttcp-t: socket -ttcp-t: connect -ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5000 tcp -> -localhost -ttcp-t: 16777216 bytes in 0.16 real seconds = 804.06 Mbit/sec +++ -ttcp-t: 2048 I/O calls, msec/call = 0.08, calls/sec = 12864.89 -ttcp-t: 0.0user 0.0sys 0:00real 46% 0i+0d 0maxrss 0+2pf 120+1csw - - -2006-07-28, Stefan Roese sr@denx.de