Hi Everyone,

I'm planning to setup 32bit RHEL 3.0 with enterprise kernel
IBM machine has 16GB physical Memory
What size estimate Kernel space and User space?

Jun wrote:
> Hi Everyone,
>
> I'm planning to setup 32bit RHEL 3.0 with enterprise kernel
> IBM machine has 16GB physical Memory
> What size estimate Kernel space and User space?

Depends entirely on what the machine will be used for.

When it's to be a database server with heavy data manipulation, small
kernel memory and large application memory will give the database server
the maximum amount of workspace memory.
On the other hand, the same database server with thousands of client
connections should have a larger kernel space to handle the network
connections.

Since the static (code) portions of the kernel don't grow, you need only
be concerned with how much dynamic memory is needed - if you expect to
run thousands of processes, use megabytes of buffered disk access, and
ridiculously large stack spaces needed by very badly written
applications, then the kernel space becomes an issue.

I didn't know you could even adjust this for Linux.

Hi Jeroen,

Thanks for your reply,

This machine will be used for Database server for Oracle 10g.
Some Oracle articles say that Oracle VLM can allocate Physical Mem to User
space
as database cache.
If a larger kernel space needed , can we control a ratio of Kernel space and
User space ?


"Jeroen Geilman" <not@home.no> wrote in message
news:h8st54-d82.ln1@core.adaptr.nl...
> Jun wrote:
> > Hi Everyone,
> >
> > I'm planning to setup 32bit RHEL 3.0 with enterprise kernel
> > IBM machine has 16GB physical Memory
> > What size estimate Kernel space and User space?
>
> Depends entirely on what the machine will be used for.
>
> When it's to be a database server with heavy data manipulation, small
> kernel memory and large application memory will give the database server
> the maximum amount of workspace memory.
> On the other hand, the same database server with thousands of client
> connections should have a larger kernel space to handle the network
> connections.
>
> Since the static (code) portions of the kernel don't grow, you need only
> be concerned with how much dynamic memory is needed - if you expect to
> run thousands of processes, use megabytes of buffered disk access, and
> ridiculously large stack spaces needed by very badly written
> applications, then the kernel space becomes an issue.
>
> I didn't know you could even adjust this for Linux.

In alt.os.linux Jun <juntaroo2000******.co.jp>:
> "Jeroen Geilman" <not@home.no> wrote in message
> news:h8st54-d82.ln1@core.adaptr.nl...
>> Jun wrote:

[ fixed top posting, general formatting ]

>> > I'm planning to setup 32bit RHEL 3.0 with enterprise kernel
>> > IBM machine has 16GB physical Memory What size estimate
>> > Kernel space and User space?
[..]

>> Since the static (code) portions of the kernel don't grow, you
>> need only be concerned with how much dynamic memory is needed
>> - if you expect to run thousands of processes, use megabytes
>> of buffered disk access, and ridiculously large stack spaces
>> needed by very badly written applications, then the kernel
>> space becomes an issue.

>> I didn't know you could even adjust this for Linux.

> This machine will be used for Database server for Oracle 10g.
> Some Oracle articles say that Oracle VLM can allocate Physical
> Mem to User space as database cache. If a larger kernel space
> needed , can we control a ratio of Kernel space and User space
> ?

Remote guess you are talking about Oracle SGA and alike stuff,
the info about memory split can be found (www.redhat.com) in the
technical specs for RHEL.

I strongly suggest to take a deep look at www.puschitz.com.
You'll find there very well written guides how to setup various
versions of Oracle on RHEL and how to go about kernel tuning for
Oracle.

Good luck

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