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SubjectLinux kernel 2.2.17 appears not support >512M RAM Disk

On Linux kernel 2.2.17 running on an intel PIII system with 1GB RAM I
cannot successfully create a ramdisk of greater than 512MB. The relevant
kernel parameter (CONFIG_BLK_DEV_RAM_SIZE) was set to 737280 before
rebuilding the kernel.

So I do the following from the command line:

dd bs=1024 if=/dev/zero of=/dev/ram0 count=737280
mke2fs /dev/ram0 524288
mount /dev/ram0 /ramdisk

This works, but if I increase the size passed to mke2fs beyond 524288
(like to 700 megs or so... or anything in between), mke2fs succeeds, but
mount does not! This happens even after a clean reboot.

mount returns an error on the console of:

EXT2-fs: Magic mismatch, very weird!
mount: wrong fs type, bad option, bad superblock on /dev/ram0,
or too many mounted file systems.

/proc/meminfo indicates that a huge chunk of RAM has been set aside for
buffers, but mount can't apparently make anything of what's there.

I can try and provide more info if anybody would like. I'm rather stuck.

Can anybody offer some insight as to a solution?

Also, if I'm sending this to the wrong place, please redirect me.


Ryan Tokarek
Unix SysAdmin
Wolfram Research
(not speaking for my employer)
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