[Gllug] HIGHMEM

[Luke Hopkins]

Following on from this:
It would appear that I wasn't in fact booting the correct kernel (I
know, I know). However that has led me to a new problem.
Based on the standard raid.s kernel, I have made the single change of
selecting the correct processor (instead of generic 486). A compile
later, and I get a kernel panic (unable to mount root FS).
Much googling has some suggestions, but no solutions.

What I'm thinking is that the recompiled kernel isn't finding something,
either a scsi device, raid device or ext3 fs. Unfortunately I can't
scroll the console back far enough to get an answer on this.

I've made sure I'm booting the right kernel (:-), with the right map
etc, but to no avail.
As far as I can tell pretty much everything is enabled in the kernel,
all the scsi stuff is turned on, all the raid stuff, ext3 is enabled
etc.

The order I did things (actually have tried many variations, all same
result):
Make clean,menuconfig,dep,bzImage,module,modules_install,install
Edited lilo to reflect correct new kernel, and rebooted.
I've never had this problem on IDE systems, new kernel builds are always
fine, so this leads me to suspect the scsi system somewhere.

Currently at a bit of a loss to be honest :-(

Cheers
Luke

-----Original Message-----
From: gllug-bounces at gllug.org.uk [mailto:gllug-bounces at gllug.org.uk] On
Behalf Of Ian Norton
Sent: 14 September 2004 14:05
To: Greater London Linux Users Group
Subject: Re: [Gllug] HIGHMEM


On Tue, 2004-09-14 at 13:17, Luke Hopkins wrote:
> Hi All, slight issue with Slackware 10.
> I'm running a fairly intensive database app on a Dell 1750 with 2Gb of
> Ram. My problem is that Slackware 10 will only see ~1Gb of the Ram.
> 
> 'dmesg' informs me:
> Warning only 896MB will be used.
> Use a HIGHMEM enabled kernel.
> 896MB LOWMEM available.
> 
> A little later it reports:
> Memory: 904016k/917504k available (2097l kernel code, 13104k reserved,
> 699k data,124k init, 0k highmem)
> 
> The above are the meesages I receive after recompiling the kernel with
<
> 4Gb HIGMEM support, and I/O Highmem support.
> 
> So, it looks as though recompiling the kernel with the support has
made
> no difference. Any thoughts why this would be?
> I have no swap partition (wanted to do some benchmarking with physical
> memory only). Does HIGHMEM require swap space to use as addressing?

Have you made sure you had a clean build? (make clean) 
you can get some wierd stuff when building with mixed configs.

Ian

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