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To: Andrea Arcangeli <andrea@suse.de>
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Value of TASK_UNMAPPED_SIZE on 2.4
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From: Kai Harrekilde-Petersen <Kai.Harrekilde-Petersen@exbit.dk>
Date: 03 Nov 2000 21:27:07 +0100
In-Reply-To: Andrea Arcangeli's message of "Fri, 3 Nov 2000 19:38:34 GMT"
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Andrea Arcangeli <andrea@suse.de> writes:

> On Fri, Nov 03, 2000 at 11:15:46AM -0800, Josue Emmanuel Amaro wrote:
> > (page.h).  This works out to be a value of 0x4000000.
> 						      ^ one more zero here
> > Are there any negative side effects in defining TASK_UNMAPPED_SIZE to 0x1000000?
> 
> I guess you mean 0x10000000. There's no risk in doing that. I also did another
> patch that moves the kernel away and allows 3.5G per process on IA32 via plain
> mmap or shmat, but it has the downside of reducing a lot the ZONE_NORMAL where
> on IA32 buffercache and skb still lives.

Is this available as a patch, or preferably as a compilation option to
the standard kernel?

The ASIC tools that we use wants all the memory they can grab, and the
extra few hundred megs can sometimes be _very_ critical.  On Solaris,
Synopsys' Design Compiler can allocate 3.8Gig and we've hit that limit
hard when working with toplevel netlists and SDF databases.

Thanks in advance,


Kai
-- 
Kai Harrekilde-Petersen
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