Re: allocate huge amounts of kernel memory

Subject: Re: allocate huge amounts of kernel memory
From: Umesh Vaishampayan <email@hidden>
Date: Tue, 5 Nov 2002 13:58:06 -0800

On Monday, November 4, 2002, at 07:54 AM, Heiko Panther wrote:

> Hi Umesh,
>
> >> my IOKit driver wants to allocate really a lot of buffers with
> >> IOMalloc(). At about 4 MB of alloc'd memory, further calls to
> >> IOMalloc() fail. Is there some kind of limit defined? How can I
> >> circumvent this problem?
>
> > Hope you realize that's 4MB of kernel *wired* memory....
>
> Of course.
> For my testing purposes, I can afford wasting some wired memory. Could
> you tell me why it fails, and how I can get more of that precious wired
> memory?
>
> Thank you-
> Heiko Panther

UTSL.

IOMalloc() is just a wrapper around kalloc(). kalloc() allocates memory
from a sub map which is limited to 16MB.

May be in your case other kalloc() consumers already gobbled up 12MB...
Hence you get a failure at around 4MB.

--Umesh
--
Umesh Vaishampayan Apple Computer, Inc.
Mac OS X Kernel Ph: (408) 974 0229
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References:
	>Re: allocate huge amounts of kernel memory (From: Heiko Panther <email@hidden>)

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