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Difference between kernel ELsmp and EL

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Operating Systems Linux Red Hat Difference between kernel ELsmp and EL
# 1  
Old 06-22-2009
Difference between kernel ELsmp and EL
Hi,

Could anyone let me know what is the fundamental difference between the below two kernels? Or point me to some docs which explain this.

2.6.9-55.ELsmp
2.6.18-92.el5

Does it will have an impact as software built for one wont necessarily run on the other? I'm having a similar problem. Any help would be much appreciated.

Also, does the version change from RHEL 4.x to 5.x will have a siginificant impact to a software built to run on 4.x? Isn't it backward supported?

Thanks and Regards,
Tobby.
# 2  
Old 06-22-2009
the SMP stands for Symmetric Multi Processing. If you have more than 1 CPU or a CPU with multiple cores, in order to fully use their potential, you should use an SMP kernel. However, I believe this is an out of date methodology now, as the base kernel should have support for multiple CPUs to a certain extent now.

If you are writing code, be aware that there is not a linear scaling with multiple CPUs and that having multiple CPUs can cause issues with threading; both good and bad.

---------- Post updated at 01:20 PM ---------- Previous update was at 01:19 PM ----------

Also

Most software SHOULD run from RHEL 4.x to 5.x, however it may not always work. If the software was using specific calls to dynamically linked libraries that are superseded or do not exist you may have issues. This would be on a case by case basis.
# 3  
Old 06-23-2009
thanks a lot mark54g.
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