linux-kernel - Re: Crash on reducing the kernel mem.

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Message-ID: <AANLkTi=xaTdjrb3ZO5dU+bY_GpaBE4F2-0gFmN=SykD5@mail.gmail.com>
Date:	Mon, 6 Sep 2010 16:17:19 +0530
From:	Prabhu Chawandi <prabhu.chavandi@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	kernelnewbies@...linux.org
Subject: Re: Crash on reducing the kernel mem.

Hi Greg,

  I am specifying the memory as part of command line parameter "mem=".
I know only that what ever amount specify against "mem=" will be a
kernel memory and rest is used for the drivers.

If I have not answered you correctly, please give me a chance to understand...

thanks,
Prabhu

On Fri, Sep 3, 2010 at 7:30 PM, Greg KH <greg@...ah.com> wrote:
> On Fri, Sep 03, 2010 at 12:04:09PM +0530, Prabhu Chawandi wrote:
>> Hi all,
>>
>>  I am using MIPS processor, with 256 MB RAM. currently I am using 128
>> M for drivers and 128 M for Kernel. I tried to allocate more memory
>> for Drivers,
>> surprisingly I got crash when I reduced kernel memory to 110 M. My
>> debugging took me to USB controller, which was not reset in
>> bootloader.
>>
>> I am not having any clue, why it didnt crash with 128 M ? How reducing
>> memory  for kernel bringing it up ?
>
> Perhaps your drivers really needed that much memory.  How are you
> "splitting" memory up between drivers and the kernel when the drivers
> and kernel all share the same memory areas?
>
> good luck,
>
> greg k-h
>
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