Re: Re: Need help in creating 8GB RAMDISK

[Joel Jaeggli]

sorry, butI don't think you're going to get there.  appending two 4GB 
rammdisks using linux software raidraid might work. but creating one 
single ramdisk larger won't work cleanly.


On Sun, 4 Jul 2004, Fawad Lateef wrote:

> 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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> > -- 
> >
> --------------------------------------------------------------------------
> > 
> > Joel Jaeggli  	       Unix Consulting 	      
> > joelja@xxxxxxxxxxxxxxxxxxxx    
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> > C38B F000 35AB B67F 56B2
> > 
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> 
> 
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Joel Jaeggli  	       Unix Consulting 	       joelja@xxxxxxxxxxxxxxxxxxxx    
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