Run out of memory

Run out of memory

[david stevenson]

Hi
I am running on a 486 with 4meg ram, and using mtd flash driver and jffs2, and 
I have now run out of ram.
As a very general guide can someone give me an idea how much ram the mtd 
driver and the jffs2 code should use up.
In round figures the kernel is using 2meg code,data,reserved, and free shows 
1700k used 300k free, before I try to run anything.

Some hints of whether this looks normal or odd would be much appreciated.
David

Re: Run out of memory

[Michal Schulz]

On Fri, 16 Jan 2004, david stevenson wrote:

> In round figures the kernel is using 2meg code,data,reserved, and free shows
> 1700k used 300k free, before I try to run anything.
>
> Some hints of whether this looks normal or odd would be much appreciated.
> David

Try to put kernel image into some kind of ROM memory (may be flash as
well). Then you can first of all reduce the amount of memory consumed by
kernel itself. On one of machines I was working few years ago (386EX)
there was 1700K free RAM after system bootup, whereas total amount of RAM
was 2.5MB. (0K used for kernel code)


-- 
Michal Schulz

Re: Run out of memory

[david stevenson]

On Monday 19 January 2004 7:22 am, Michal Schulz wrote:
> On Fri, 16 Jan 2004, david stevenson wrote:
> > In round figures the kernel is using 2meg code,data,reserved, and free
> > shows 1700k used 300k free, before I try to run anything.
> >
> > Some hints of whether this looks normal or odd would be much appreciated.
> > David
>
> Try to put kernel image into some kind of ROM memory (may be flash as
> well). Then you can first of all reduce the amount of memory consumed by
> kernel itself. On one of machines I was working few years ago (386EX)
> there was 1700K free RAM after system bootup, whereas total amount of RAM
> was 2.5MB. (0K used for kernel code)

Thanks, that would be the largest item in ram out of the way. I will have to 
look at the odd parallel memory maps on my sc400 to work out how to map that.
Is there a howto for kernel xip?

I am interested to know if either mtd or jffs2, use large amounts of ram, in 
this case large being in the 100's of kb. And do they use any user space ram 
or is it all in kernel data?

David