On Wed, 02 Nov 2005 18:49:55 +0300 Ilya wrote: > I've ASUS P4P800-Mx-EAYVZ motherboard and have to use a 2GB memory. But > after including PAE support in kernel it almost twice... Surely, i > understand, that it's inevitable, the slowing of PAE, but twice?! Does > anybody faced this problem? Or is there some bug in PAE?! I tested the > PAE at some other motherboards, but only on this model on asus it works > strange) [skip] > Here is the difference in kernels: > khext@al:~$ diff linux-2.4.31/.config linux-2.4.31-PAE/.config > 61,62c61,62 > < CONFIG_NOHIGHMEM=y > < # CONFIG_HIGHMEM4G is not set > --- > > # CONFIG_NOHIGHMEM is not set > > CONFIG_HIGHMEM4G=y > 64c64,65 > < # CONFIG_HIGHMEM is not set > --- > > CONFIG_HIGHMEM=y > > CONFIG_HIGHIO=y CONFIG_HIGHMEM4G does not enable PAE - it is CONFIG_HIGHMEM64G which does it. So the slowdown must be due to something other than PAE. Please also show the start of dmesg output - lines which look like: BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) ... xxxMB HIGHMEM available. xxxMB LOWMEM available. Also show the output of "cat /proc/mtrr". Some systems have buggy MTRR setup done by BIOS, which can lead to such slowness when using the full amount of memory. Such problems may be fixed by a BIOS upgrade, or worked around by specifying the mem=... option to avoid using the memory which is not covered by MTTRs (if the amount of such misconfigured memory is not excessively large).
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