 | | | Is the system SMP capable? | Is the system SMP capable? 2006-08-25 - By Jay Lee
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Ben Spencer wrote:
> We have an appliance for which we supplied the hardware and the vendor
> supplied the application (including OS). It is based off of RHEL 3
> though. The vendor compiled their own kernel though (removing unneeded
> things).
>
>
Do you have a .config from the kernel compile? Is SMP enabled in it?
By default RHEL3 puts the config file in /boot/config-$version file.
See what that says.
> Is there a way to determine if the OS will take advantage of additional
> CPUs if one was installed without having the kernel config file and
> nothing apparent being displayed at boot/via uname? We don't want to buy
> additional CPUs for the box and find out the OS will not support them.
>
>
If SMP is enabled, the OS will take advantage of it. That's not to say
the application will though, only testing or talking to the vendor will
tell you that (ummm... What vendor? you didn't say...)
> Is there any performance gain from 2 CPUs when the OS isn't SMP enabled?
>
>
No, the second CPU will sit idle the whole time.
> We could ask the vendor, but they are trying to push a "high
> performance" appliance (software + hardware) as the solution. Licensing
> is per box install, not per CPU so that shouldn't be an issue either.
>
See if you can get a tech on the line, they tend to be more "real world"
honest without throwing marketing crap at you when they can, ask him his
honest opinion, would it work? would it be supported? Would it be cost
effective? A good tech. will be square with you unless his company has
forbidden him to be...
Jay
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