Messages in this thread | | | Date | Thu, 30 Jul 1998 20:42:49 +0100 (GMT) | From | Jon Evans <> | Subject | vgacon / vesafb performance stats |
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Hi all,
OK, so the test was *really* simplistic, but I've got the following figures. NB the "averages" were over 5 runs on a lightly loaded system running normal daemons. They weren't calculated, they are just rough averages from eyeballing the script outputs.
Executive Summary =================
The new vgacon code in 2.1.112 is faster than the console code in 2.0.34.
Further Details ===============
The vga console code in 2.1.112 is 2.3 times faster than the same code in 2.0.34 at writing individual characters. It's nearly 4 times faster than 2.0.34 at writing strings.
In 2.1.112, the new vesa console is 20 times slower than the vgacon code at writing individual characters. It's only about 15 times slower at writing strings.
There isn't much speed benefit in 2.0.34 between writing individual chars to the console and writing bunches of chars. Writing 5 million chars in strings of 5 characters is only 1.3 times faster than writing the 5 million chars individually. In 2.1.112 it's about 2.1 times faster than writing the chars individually.
Raw Data ========
Test 1: Write 1 million chars to the screen ===========================================
2.1.112 vgacon: ave 0:4.66 elapsed, 2.90 user, 1.75 system
2.1.112 vesa:redraw ave 1:32.10 elapsed, 2.93 user, 89.12 system
2.1.112 vesa:memmove (I ran out of patience!)
2.0.34 stock redhat-5.1 ave 0:10.90 elapsed, 2.90 user, 8.05 system
Test 2: Write the string "Linux" to the screen 1 million times ==============================================================
2.1.112 vgacon ave 0:10.84 elapsed, 1.96 user, 8.89 system
2.1.112 vesa:redraw ave 2:58.87 elapsed, 4.60 user, 88.50 system
2.1.112 vesa:memmove not enough hours in the day :-)
2.0.34 stock redhat-5.1 ave 0:41.90 elapsed, 1.90 user, 40.00 system
System Used ===========
An Intel P200 non-MMX with an ATI 3D Expression+ PC2TV (Mach64)
vesa mode used: mode "name" # H: 0.000 kHz, V: 0.000 Hz geometry 640 480 640 480 8 timings 0 0 0 0 0 0 0 endmode
Frame buffer device information: Name : `VESA VGA' Address : 0xfd000000 Size : 307200 Type : PACKED PIXELS Visual : PSEUDOCOLOR XPanStep : 0 YPanStep : 0 YWrapStep : 0 LineLength : 640 Acceleration: None -- Jon Evans
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