Why RedHat AS 2.1 didn't use SWAP partition even no free memory?

[microsky]

I recently setuped a Redhat AS 2.1 server, the harddisk is 40GB and memory is 1GB, CPU is P4 2.4GHz. The installation is OK, no error and no warning. But when I installed Oracle9i into this system, I found the OS didn't use swap partition even there is no free memory, and the system is very slow after use up memory. I checked swap usage using command "swapon -s", it seemed OK. Any body know how to troubleshoot?

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[root@webdev root]# swapon -s
Filename Type Size Used Priority
/dev/hdc8 partition 2040212 0 -1
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Thanks!
microsky

 

[jasen001]

If swap memory is not working, i have another option for a creating a diffreent swap memory.
create a empty file by using
# touch swapfile
command then again
# swapadd swapfile
this file will work as a swap memory for your applications.

 

[microsky]

Thanks for your reply!
But this is unuseful, even I added new swapfile into system, it also didn't use it.
I think maybe this problem is relate to hardware. Because I installed same version(kernel-2.4.9-e.3) into another PII400 machine, the swap is running well, everything is Ok.
Now iffy machine's CPU is Intel P4 2.4GHz,mainboard is ECS L4S5M/DX+(chipset is SiS645DX+SiS962L). I found there is a error in /var/log/messages as following, the root reason is RedHat AS 2.1 is not support this chipset, isn't it? Are there anyone meet the same problem?

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modprobe: modprobe: Can't locate module char-major-226
modprobe: modprobe: Can't locate module char-major-226
kernel: Linux agpgart interface v0.99 (c) Jeff Hartmann
kernel: agpgart: Maximum main memory to use for agp memory: 816M
agpgart: Unsupported SiS chipset (device id: 0646), you might want to try agp_try_unsupported=1.
===============================================

Thanks!

 

[jasen001]

Well one thing i left, i did not mention the size of file (swap file)
correct that last command

# swapadd +500M swapfile
As per my previous post the swap file is created but with default size (i.e. 0 MB)
That's why the system can not use this file as a swap memory.
And about your original problem, i think u should check your hardwares.