Re: Re: Need help in creating 8GB RAMDISK

[Fawad Lateef]

Dear Joel 

Can you please tell me the way of using more than 4GB
of RAM in a single process or module ???? I tried to
solve that problem using threads, but it isn't working
tooo, there might be the problem in my thread
implementation but can it be done using threads ???
Please do tell me way of doing this ......... 

I also tried to make 2 different modules each for 4GB
and then made another module which is just receiving
the request changes its bh->b_rdev to the
corresponding drive and returns 1. So kernel will try
to call the request function of the module related to
bh->b_rdev. but this is also not working .!!!!

Please help me ..... I m working on Linux-2.4.23

Thanks and Regards,

Fawad Lateef




> On Sun, 4 Jul 2004, Fawad Lateef wrote:
> 
> > Hello
> > 
> > I am creating a RAMDISK of 7GB (from 1GB to 8GB).
> I
> > reserved the RAM by changing the code in
> > arch/i386/mm/init.c .......... 
> > 
> > But I am not able to access the RAM from 1GB to
> 8GB in
> > a kernel module ........ after crossing the 4GB
> RAM,
> > the system goes into standby state. But if I
> insert
> > the same module 2 times means one for 1GB to 4GB
> and
> > other for 4GB to 8GB. and mount them seprately
> both
> > works fine ............ 
> 
> on a non-64bit intel architecture you can only grab
> 4GB of ram per 
> process because that's how big the page table is.
> There are 16 4GB page 
> tables for the 64GB ram that intel machines are
> capable of addressing.
>  
> > Can any one tell me the reason behind this ??? I
> think
> > that in a single module we can't access more than
> 4GB
> > RAM ...... If this is the reason then what to do
> ??? I
> > need 7GB RAMDISK as a single drive ....
> > 
> > Thanks and Regards,
> > 
> > Fawad Lateef
> > 
> > 
> > 		
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> 
> -- 
>
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> 
> Joel Jaeggli  	       Unix Consulting 	      
> joelja@xxxxxxxxxxxxxxxxxxxx    
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