Shared memory segment > 1gb

Shared memory segment > 1gb

[Jason Froebe]

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Hi,

I'm trying to get a shared memory segment of just under 2 gb.  So
far, I've been able to get a 893mb shared segment by altering the
_SHM_IDX_BITS to 18 in include/asm/shmparam.h using the 2.2.0
kernel.  I'm assuming I can set the _SHM_IDX_BITS to 19 without a
problem (more overhead though), but since this is my "working"
computer, I don't want any surprises.  is this possible without
breaking something?  I glanced at the code but didn't see any
obvious "gotchas".

Don't ask why I don't use multiple segments.  It's not my
decision.

Jason

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Re: Shared memory segment > 1gb

[Jason Froebe]

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Jason Froebe wrote:

> Hi,
>
> I'm trying to get a shared memory segment of just under 2 gb.  So
> far, I've been able to get a 893mb shared segment by altering the
> _SHM_IDX_BITS to 18 in include/asm/shmparam.h using the 2.2.0
> kernel.  I'm assuming I can set the _SHM_IDX_BITS to 19 without a
> problem (more overhead though), but since this is my "working"
> computer, I don't want any surprises.  is this possible without
> breaking something?  I glanced at the code but didn't see any
> obvious "gotchas".
>
> Don't ask why I don't use multiple segments.  It's not my
> decision.
>
> Jason
>
>  - jfroebe.vcf

Hi,

I've increased the _SHM_IDX_BITS to 19 and decreased _SHM_ID_BITS to
5 with SHMMAX set to 2gb - 2*page size but it didn't help.  I'm
still stuck at 893mb.

Does anyone know of how to increase the shared memory segment
further without using multiple segments?

Thanks

Jason

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