7 GB RAM Drive

7 GB RAM Drive

[Naveed Latif]

hello dears,

I want to make a 7 GB RAM Disk.
thorugh PAE I can access 64 GB, but problem is that
one kernel module can't access more then 4gb at ones.
2 disks are working properly.
So I tried this method..

[DISK1....3GB]       [Disk2......4GB]
           *             *
             *          *
               *       *
           [Virtual disk  7GB]


when I recieve buffer head in virtual disk, by
changing its [bh->b_rdev = disk1] or [bh->b_rdev =
disk2]
I called generic_make_requestm but the same result,
after 4gb it is failed.


even through list mechanism by which disk have a
thread which getting bh(buffer head) from the list,
and performed the operation. these bh's coming from
virtual Disk.
This method is also failed..

Can any one help me regarding this issue, How I can I
solve this problem.


Thanks.
Naveed Latif

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Re: 7 GB RAM Drive

[William Lee Irwin III]

On Thu, Jul 15, 2004 at 04:54:59AM +0100, Naveed Latif wrote:
> Can any one help me regarding this issue, How I can I
> solve this problem.

Fix up rd.c so it can do mapping->gfp_mask |= GFP_HIGHUSER.


-- wli

Re: 7 GB RAM Drive

[Jeff Garzik]

Naveed Latif wrote:
> hello dears,
> 
> I want to make a 7 GB RAM Disk.


Use ramfs.

	Jeff

Re: 7 GB RAM Drive

[William Lee Irwin III]

Naveed Latif wrote:
>> hello dears,
>> I want to make a 7 GB RAM Disk.

On Thu, Jul 15, 2004 at 02:17:53AM -0400, Jeff Garzik wrote:
> Use ramfs.
> 	Jeff

rd.c has numerous issues beyond the performance/capacity -related ones
that are irreparable without invasive changes elsewhere in the kernel
(and similarly, the performance/capacity  issues require likewise). So
it would be best for him to do so if possible, yes. So I concur.


-- wli