Re: Kernel parameter for 8.0.5 (on SUSE 6.0)

From: <karsten_schmidt8891_at_my-deja.com>
Date: Tue, 14 Sep 1999 09:57:05 GMT
Message-ID: <7rl65d$8on$1@nnrp1.deja.com>

> The docu recommends the following values:
>
> SHMMAX 4294967295 (currently defined as 0x2000000)

this depends on what memory you need for your sga and block buffers etc.

The default value would allow you about 500M shared mem, the recommended value 4G.

Note the allocated memory should _never_ exceed the amount of physical memory on your machine or the OS wil start paging.

> SHMMNI 100 (currently defined as (1<<_SHM_ID_BITS))

Not sure what this Constant defines, the value is basically 0x1 left-shifted by _SHM_ID_BITS bits,
or 2 ^ _SHM_ID_BITS. Sounds like 100 does not really make sense, as the original value is a power of 2.

Look at the ANSI C spec for more details on the << operator. You might want to post that to a linux kernel NG for details on the meaning of these values.

I suppose, you need to recompile your OS Kernel after changing these values.

Karsten

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Share what you know. Learn what you don't. Received on Tue Sep 14 1999 - 04:57:05 CDT