[gentoo-dev] preformance in gentoo

[Eske Christiansen]

Hi all

I was building a new cluster of dell optiplexs n-series(P4, 512 Mb ram, 
120Gb disk) to descide on which linux dist to use I ran a som tests to see
which suited my needs (it was a test to see if a std gentoo install (not many
CFLAGS) was better than minimum redhat install).
I was very superised to learn that when running lmbench gentoo version 1.4rc3 (upto date, march=pentium3) was slower in system calls than redhat 8.0 and 9.0. infact tcp select was 5 times slower om gentoo.
Does any know what redhat have done to there kernel? Is it a question on the
module ratio in the kernel or du you have any ideers. I like gentoo but 5 times slower in tcp select must be fixed (if any can lead me in the right direction
I will gladly look at it.).

The some of test results (the change in hostname is dhcp all run on the same
hardware) :
gentoo:
Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host                 OS  Mhz null null      open slct sig  sig  fork exec sh
                             call  I/O stat clos TCP  inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
amigos41. Linux 2.4.20-    2 0.64 0.89 2.84 4.26 28.3 0.93 3.27 155. 520. 2140
amigos41. Linux 2.4.20-    2 0.65 0.90 2.90 4.38 28.3 0.94 3.24 155. 524. 2156
amigos41. Linux 2.4.20-    2 0.64 0.90 2.83 4.30 27.6 0.94 3.28 153. 528. 2154
amigos41. Linux 2.4.20-    2 0.64 0.90 2.85 4.29 27.7 0.94 3.36 153. 545. 2153
amigos41. Linux 2.4.20-    2 0.64 0.90 2.86 4.32 27.7 0.94 3.28 155. 516. 2152
amigos41. Linux 2.4.20-    2 0.64 0.90 2.83 4.31 27.6 0.93 3.28 156. 524. 2156
amigos41. Linux 2.4.20-    2 0.64 0.90 2.83 4.30 28.3 0.94 3.28 156. 522. 2163
amigos41. Linux 2.4.20-    2 0.64 0.89 2.84 4.29 28.3 0.93 3.24 155. 516. 2149
amigos41. Linux 2.4.20-    2 0.64 0.90 2.84 4.33 28.3 0.93 3.25 154. 519. 2148
amigos41. Linux 2.4.20-    2 0.64 0.90 2.83 4.31 28.3 0.94 3.25 154. 529. 2152

redhat (redhat 8.0, the redhat 9.0 shows the same numbers):
Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host                 OS  Mhz null null      open slct sig  sig  fork exec sh
                             call  I/O stat clos TCP  inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
amigos42. Linux 2.4.18-    2 0.55 0.62 1.56 2.32 6.34 0.92 3.16 119. 432. 2218
amigos42. Linux 2.4.18-    2 0.55 0.61 1.56 2.27 6.37 0.91 3.22 120. 428. 2213
amigos42. Linux 2.4.18-    2 0.55 0.61 1.57 2.31 6.33 0.91 3.13 122. 430. 2237
amigos42. Linux 2.4.18-    2 0.55 0.61 1.59 2.28 6.59 0.90 3.19 119. 441. 2214
amigos42. Linux 2.4.18-    2 0.55 0.63 1.55 2.28 6.65 0.91 3.17 121. 444. 2226
amigos42. Linux 2.4.18-    2 0.55 0.61 1.56 2.31 6.43 0.90 3.22 125. 431. 2223
amigos42. Linux 2.4.18-    2 0.55 0.61 1.58 2.29 6.64 0.90 3.25 121. 446. 2222
amigos42. Linux 2.4.18-    2 0.55 0.61 1.58 2.30 6.23 0.90 3.20 120. 431. 2215
amigos42. Linux 2.4.18-    2 0.55 0.61 1.56 2.26 6.24 0.90 3.13 123. 441. 2213
amigos42. Linux 2.4.18-    2 0.55 0.61 1.53 2.27 6.58 0.91 3.22 118. 434. 2216

yours
Eske
 

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