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Old 10-04-2004, 04:31 AM   #1
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Registered: Oct 2004
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Question rebuild kernel 2.6 boot fail on soft RAID fs

Dear all,
I've installed a Ferdora Core 2 kernel 2.6 for samba file server. It seems that the CPU load is increased more much than when I use RedHat9 kernel 2.4 before. A guy told me that the CPU load raised because kernel 2.6 use kernel clock 1000Hz (1kHz) instead of 100Hz as kernel 2.4.
So, I have rebuilt my kernel to change that option and following are what I've done:
cd /usr/src/linux-2.6.5-1.358
make oldconfig

edit file /usr/src/linux-2.6.5-1.358/include/asm-i386/param.h change the line
#define HZ 1000
to be
#define HZ 100

make bzImage
make modules
make modules_install
make install


System boot fail when i choose custom kernel (the rebuilt kernel).

My server uses 3 IDE HDDs made 2 software raid array:
md0: raid1 mount: /boot
md1: raid5 mount: /

If I rebuild the kernel with the above steps on a single HDD PC (no raid array activated), there is no problem.

Please help me to solve the problem. My goal is: down the kernel clock from 1000Hz to 100Hz .

I am a newbie, so please kindly guide me step-by-step.

Thank you very much!


Last edited by Ducko; 10-04-2004 at 04:35 AM.
Old 10-04-2004, 02:13 PM   #2
Registered: Oct 2003
Location: San Deigo, CA
Distribution: FC3, Win2k Server, XP Pro & 2003 Server
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#define HZ 1000

#define HZ 100

?? did you mean to append those lines " # " it will read right past it
Old 10-04-2004, 09:47 PM   #3
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the line read:
#define HZ 1000 ....
defines the kernel clock is 1000Hz.

I've just changed it into:
#define HZ 100 ...
to define the kernel clock is 100Hz.

However, in my situation, this does not cause the problem. I've rebuilt the kernel successfully on a single HDD PC.

Thank you for your reply.


PS: I've just wondered why the "rebuilt" kernel fail to boot when the mount /boot is placed on a software raid array

Last edited by Ducko; 10-04-2004 at 09:55 PM.
Old 10-04-2004, 10:28 PM   #4
Registered: Sep 2004
Location: Canberra, Australia
Distribution: Fedora Core 3, Ubuntu Hoary, Slack 10.1
Posts: 120

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Not sure on this one....
Did you build your RAID support straight into the kernel or as a module?
Old 10-05-2004, 09:40 PM   #5
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Dear all,
Thank you very much for all your replies!
After several test cases, I found that rebuilding the kernel makes nonsense . Therefore, the problem is not concerned any more
This topic should be closed here. THank you very much to all of you.


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