Lower performance in 2.6.2 compared to 2.4.22

From: Andrei Mikhailovsky
Date: Thu Feb 05 2004 - 18:22:02 EST

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Hello,

Just finished tests using Byte benchmark (available from unix.com).

2.4.22 has better results in both benchmarks. Here are results:


- ---Byte benchmark on 2.6.2 BEGIN---
~ BYTE UNIX Benchmarks (Version 3.11)
~ System -- Linux (none) 2.6.2 #1 Wed Feb 4 14:32:05 GMT 2004 i686
GNU/Linux
~ Start Benchmark Run: Thu Feb 5 19:41:01 GMT 2004
~ 0 interactive users.
Dhrystone 2 without register variables 4824680.0 lps (10 secs, 6
samples)
Dhrystone 2 using register variables 4823649.9 lps (10 secs, 6
samples)
Arithmetic Test (type = arithoh) 9008352.2 lps (10 secs, 6
samples)
Arithmetic Test (type = register) 388928.1 lps (10 secs, 6 samples)
Arithmetic Test (type = short) 373900.1 lps (10 secs, 6 samples)
Arithmetic Test (type = int) 388868.2 lps (10 secs, 6 samples)
Arithmetic Test (type = long) 388872.5 lps (10 secs, 6 samples)
Arithmetic Test (type = float) 736101.7 lps (10 secs, 6 samples)
Arithmetic Test (type = double) 736099.0 lps (10 secs, 6 samples)
System Call Overhead Test 1173978.8 lps (10 secs, 6
samples)
Pipe Throughput Test 1196881.4 lps (10 secs, 6
samples)
Pipe-based Context Switching Test 400114.1 lps (10 secs, 6 samples)
Process Creation Test 15473.9 lps (10 secs, 6 samples)
Execl Throughput Test 3933.9 lps (9 secs, 6 samples)
File Read (10 seconds) 3618620.0 KBps (10 secs, 6
samples)
File Write (10 seconds) 324411.0 KBps (10 secs, 6 samples)
File Copy (10 seconds) 62389.0 KBps (10 secs, 6 samples)
File I/O no measured results
C Compiler Test no measured results
Shell scripts (1 concurrent) 4453.4 lpm (60 secs, 3 samples)
Shell scripts (2 concurrent) 2368.0 lpm (60 secs, 3 samples)
Shell scripts (4 concurrent) 1225.7 lpm (60 secs, 3 samples)
Shell scripts (8 concurrent) 615.3 lpm (60 secs, 3 samples)
Dc: sqrt(2) to 99 decimal places 149692.7 lpm (60 secs, 6 samples)
Recursion Test--Tower of Hanoi 76170.8 lps (10 secs, 6 samples)
~ INDEX VALUES
TEST BASELINE RESULT INDEX

Arithmetic Test (type = double) 2541.7 736099.0 289.6
Dhrystone 2 without register variables 22366.3 4824680.0 215.7
Execl Throughput Test 16.5 3933.9 238.4
Pipe-based Context Switching Test 1318.5 400114.1 303.5
Shell scripts (8 concurrent) 4.0 615.3 153.8
~ =========
~ SUM of 5 items 1201.0
~ AVERAGE 240.2

- ---Byte benchmark on 2.6.2 END---


- ---Byte benchmark on 2.4.22 BEGIN---
~ BYTE UNIX Benchmarks (Version 3.11)
~ System -- Linux (none) 2.4.22-bk36 #2 Fri Oct 17 14:30:25 BST 2003
i686 GNU/Linux
~ Start Benchmark Run: Thu Feb 5 21:05:04 GMT 2004
~ 0 interactive users.
Dhrystone 2 without register variables 4744521.8 lps (10 secs, 6
samples)
Dhrystone 2 using register variables 4746498.5 lps (10 secs, 6
samples)
Arithmetic Test (type = arithoh) 9065795.0 lps (10 secs, 6
samples)
Arithmetic Test (type = register) 391434.4 lps (10 secs, 6 samples)
Arithmetic Test (type = short) 376179.1 lps (10 secs, 6 samples)
Arithmetic Test (type = int) 391471.6 lps (10 secs, 6 samples)
Arithmetic Test (type = long) 391469.3 lps (10 secs, 6 samples)
Arithmetic Test (type = float) 740918.6 lps (10 secs, 6 samples)
Arithmetic Test (type = double) 741556.2 lps (10 secs, 6 samples)
System Call Overhead Test 1194144.8 lps (10 secs, 6
samples)
Pipe Throughput Test 1491956.9 lps (10 secs, 6
samples)
Pipe-based Context Switching Test 556854.3 lps (10 secs, 6 samples)
Process Creation Test 19275.1 lps (10 secs, 6 samples)
Execl Throughput Test 4244.6 lps (10 secs, 6 samples)
File Read (10 seconds) 4435520.0 KBps (10 secs, 6
samples)
File Write (10 seconds) 243964.0 KBps (10 secs, 6 samples)
File Copy (10 seconds) 41601.0 KBps (10 secs, 6 samples)
File I/O no measured results
C Compiler Test 1077.6 lpm (60 secs, 3 samples)
Shell scripts (1 concurrent) 4950.8 lpm (60 secs, 3 samples)
Shell scripts (2 concurrent) 2641.4 lpm (60 secs, 3 samples)
Shell scripts (4 concurrent) 1357.8 lpm (60 secs, 3 samples)
Shell scripts (8 concurrent) 692.1 lpm (60 secs, 1 samples)
Dc: sqrt(2) to 99 decimal places 186413.3 lpm (60 secs, 6 samples)
Recursion Test--Tower of Hanoi 76521.6 lps (10 secs, 6 samples)
~ INDEX VALUES
TEST BASELINE RESULT INDEX

Arithmetic Test (type = double) 2541.7 741556.2 291.8
Dhrystone 2 without register variables 22366.3 4744521.8 212.1
Execl Throughput Test 16.5 4244.6 257.2
Pipe-based Context Switching Test 1318.5 556854.3 422.3
Shell scripts (8 concurrent) 4.0 692.1 173.0
~ =========
~ SUM of 5 items 1356.5
~ AVERAGE 271.3


- ---Byte benchmark on 2.4.22 END---


Has anyone experienced similar results? or is it just me?

By the way, I have an the following specs:
AMD Barton 2500+ overclocked to 1968.145Mhz FSB 179Mhz,
512Mb DDR PC2700,
Hitachi 40Gb HD (HDS722540VLAT20),
Sis746FX chipset
ASRock K7S8X


- --
Andrei Mikhailovsky
Arhont Ltd

Web: http://www.arhont.com
Tel: +44 (0)870 4431337
Fax: +44 (0)1454 201200
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