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01-19-2008, 08:40 AM
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 Wierd memory problem with a custom kernel I just upgraded my system RAM from 1 GB (2x 512 MB) to 1.5 GB (512 MB + 1 GB). However, when I boot into a custom compiled kernel (2.6.21-5 with the tuxonice/suspend2 patch), I see the memory is unchanged (free -m reports 884 MB). When I boot into a vanilla Debian kernel (2.6.21-2), I see the full 1.5 GB (free -m reports 1510 MB). Needless to say, the BIOS also reports the full 1.5 GB. I do not remember hardwiring the total memory anywhere during the compilation of that kernel. Further, the grub boot line is unremarkable in either case. The system feels snappier when I use the Debian vanilla kernel (indicating that it is really seeing more RAM and I do not simply have a kernel dependent bug in free -m). Any suggestions to see where things are going awry ?      |
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01-19-2008, 08:40 AM
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| Re: Wierd memory problem with a custom kernel On Wed, 18 Jul 2007 22:18:45 -0700, Geico Caveman wrote: > I just upgraded my system RAM from 1 GB (2x 512 MB) to 1.5 GB (512 MB + 1 > GB). However, when I boot into a custom compiled kernel (2.6.21-5 with the > tuxonice/suspend2 patch), I see the memory is unchanged (free -m reports > 884 MB). When I boot into a vanilla Debian kernel (2.6.21-2), I see the > full 1.5 GB (free -m reports 1510 MB). Needless to say, the BIOS also > reports the full 1.5 GB. I do not remember hardwiring the total memory > anywhere during the compilation of that kernel. Further, the grub boot > line is unremarkable in either case. > > The system feels snappier when I use the Debian vanilla kernel (indicating > that it is really seeing more RAM and I do not simply have a kernel > dependent bug in free -m). > > Any suggestions to see where things are going awry ? My first guess would be that you did not CONFIG_HIGHMEM when you compiled your custom kernel. However, I'm not familiar with that patch, so I might not be correct. Seems to act like not configured in kernel, though. Rodney |
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