Messages in this thread |  | | Date | Sun, 24 Jul 2005 12:12:11 -0700 (PDT) | From | Ciprian <> | Subject | kernel 2.6 speed |
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Hi guys!
I got a question for you. Apparently kernel 2.6 is much slower then 2.4 and about 30 times slower then the windows one.
I'm not an OS guru, but I ran a little and very simple test. The program bellow, as you can see, measures the number of cycles performed in 30 seconds.
//----------------- START CODE --------------------
#include <stdio.h> #include <time.h>
int main() { time_t initialTime; time_t testTime; long counter = 0; double test = 1;
time(&initialTime); testTime = initialTime;
printf("Here we go...\n");
while((testTime-initialTime) < 30) { time(&testTime); test /= 10; test *= 10; test += 10; test -= 10;
counter ++;
}
printf("No. of cycles: %ld\n", counter);
return 0; }
//---------------- END CODE -------------------
In windows were performed about 300 millions cycles, while in Linux about 10 millions. This test was run on Fedora 4 and Suse 9.2 as Linux machines, and Windows XP Pro with VS .Net 2003 on the MS side. My CPU is a P4 @3GHz HT 800MHz bus.
I published my little test on several forums and I wasn't the only one who got these results. All the other users using 2.6 kernel obtained similar results regardless of the CPU they had (Intel or AMD).
Also I downloaded the latest kernel (2.6.12), configured it specifically for my machine, disabled all the modules I don't need and compiled it. The result was a 1.7 MB kernel on which KDE moves faster, but the processing speed it's the same - same huge speed ratios.
Also, it shouldn't have any importance, but my HDD is SATA so the specific modules were required. I don't think its SCSI modules have any impact on the processing speed, but you know more on the kernel architecture then I do.
Now, can anyone explain this and suggest what other optimizations I should use? The 2.4 version was a lot faster. I thought the newer versions were supposed to work faster (or at least just as fast) AND to offer extra features.
Any help would appreciate.
Thanks, Ciprian
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