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SubjectRe: > 64 MB of RAM
Date
Kevin Buettner wrote:
>
> Memory prices seem to be falling and I am contemplating buying more
> memory.
>
> In Documentation/Configure.help, it says the following:
>
> : Limit memory to low 16MB
> : CONFIG_MAX_16M
> : This is for some buggy motherboards which cannot properly deal with
> : the memory above 16MB. If you have more than 16MB of RAM and
> : experience weird problems, you might want to try Y, everyone else
> : says N. Note for machines with more that 64MB of RAM: in order for
> : the kernel to be able to use the memory above 64MB, pass the command
> : line option "mem=XXXM" (where XXX is the memory size in megabytes)
> : to your kernel during boot time. See the documentation of your boot
> : loader (lilo or loadlin) about how to pass options to the
> : kernel. The lilo procedure is also explained in the SCSI-HOWTO,
> : available via ftp (user: anonymous) in
> : sunsite.unc.edu:/pub/Linux/docs/HOWTO. You also need at least 512kB
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> : of RAM cache if you have more than 64MB of RAM. Some other things
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> Is the line about needing a 512kB cache true?
>

No, it is not true. We are running Linux (1.3.45 & 1.3.86) on computers
with more than 64 MB of RAM and only 256 kB of cache. No problems at all.
(It might be that some motherboards/BIOSes needs 512 kb of cache, but ...)

(Maybe someone cares to fix this design bug.)

/Tom
--
---------------------------------------------------------------
Tom Bjorkholm MYDATA automation AB
tel: +46 8 629 09 00 Karlsbodavagen 39
fax: +46 8 629 09 09 S-161 70 Bromma, Sweden


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