HIGHMEM not booting

irq_this · n00b Joined: 09 Aug 2003 Posts: 4

i recently came across some extra RAM so i decided to load up my server. i went from 512megs to 1.5gigs. i enabled HIGHMEM and HIGHMEM I/O but now my kernel won't boot. is there more i need to enable in my kernel to support HIGHMEM?

dberkholz · Posted: Tue Aug 12, 2003 10:16 am Post subject:

highmem is somewhat broken on ck-based kernels such as ck-sources, gentoo-sources, pfeifer-sources.
Instead of enabling highmem, change the user-address space to 2/2, which supposedly ends up doing the same thing.

Raoul_Duke · Posted: Tue Aug 12, 2003 1:33 pm Post subject:

I have no probs with high mem support on a ck-sources kernel......i think you need to remove pre-emptible support from the kernel :?:

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dberkholz · Posted: Tue Aug 12, 2003 9:55 pm Post subject:

Raoul_Duke · Posted: Tue Aug 12, 2003 10:03 pm Post subject:

Yeah.....when i first installed gentoo on this box it took me ages (about 20 kernel compiles) to make it bootable. Did some research and discovered the problem with highmem and pre-empt. Disabled it and it booted first time

Running 1gb ram with no probs now.....ck-sources-r6 btw :wink:

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irq_this · n00b Joined: 09 Aug 2003 Posts: 4

thanks alot for the information. i'd love to test it out but the extra RAM i had tossed in my server turned out to be shot. i was segfaulting all over the place and ended up corrupting / and /boot. luckily, everything important was on partitions that i didn't have mounted during testing so i didn't end up loosing to much ('cept for the hours apon hours spent installing gentoo). :cry:

xcham · Posted: Wed Aug 13, 2003 8:34 am Post subject:

I get a kernel panic, an error in sched.c, whenever I enable highmem... same deal?

Raoul_Duke · Posted: Wed Aug 13, 2003 2:44 pm Post subject:

Possibly......check if you have pre-empt enabled in your kernel and then remove it.
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irq_this · n00b Joined: 09 Aug 2003 Posts: 4

nah.... it would even segfault on 'make mrproper'. anyone know why pre-emt causes problems with HIGHMEM?

funkmankey · Guru Joined: 06 Mar 2003 Posts: 304 Location: CH

in any case, HIGHMEM and preempt play very nicely together in 2.6...

irq_this · n00b Joined: 09 Aug 2003 Posts: 4

i need to get my hands on 2.6. i need a system i can test it out on. how much do you trust its stability?

vbenares · Apprentice Joined: 13 Aug 2003 Posts: 205

Zeitgeist · Posted: Thu Sep 18, 2003 11:56 am Post subject:

Yes, I would like to know how to, too

Zeitgeist · Posted: Thu Sep 18, 2003 11:56 am Post subject:

Yes, I would like to know how to, too

Zeitgeist · Posted: Thu Sep 18, 2003 11:58 am Post subject:

Yes, I would like to know how to, too

meowsqueak · Posted: Fri Dec 12, 2003 5:28 am Post subject:

As would I - I'm getting random apps segfaulting with HIGHMEM (4Gb) enabled and 1 Gb RAM. WindowsXP seems fine.