Messages in this thread | | | Date | Mon, 6 Dec 2004 16:41:18 -0200 | From | Marcelo Tosatti <> | Subject | Re: HIGHMEM=4G slows down ps2pdf with 2.4.28 |
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On Fri, Dec 03, 2004 at 09:58:19PM +0100, Alain Tesio wrote: > On Thu, 2 Dec 2004 17:08:15 -0200 > Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote: > > > On Wed, Dec 01, 2004 at 11:25:22PM +0100, Alain Tesio wrote: > > > Hi, > > > > > > With a 2.4.28 kernel, 1.5 Go RAM and nothing exotic, everything works fine > > > with CONFIG_HIGHMEM4G and CONFIG_HIGHMEM=y except that > > > ps2pdf is about 30 times slower > > > How does /proc/mtrr look like? > > > > Maybe some of your memory is configured as uncacheable. > > reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1 > reg01: base=0x40000000 (1024MB), size= 256MB: write-back, count=1 > reg02: base=0x50000000 (1280MB), size= 128MB: write-back, count=1 > reg03: base=0x58000000 (1408MB), size= 64MB: write-back, count=1 > reg04: base=0x5c000000 (1472MB), size= 32MB: write-back, count=1 > reg05: base=0x5e000000 (1504MB), size= 16MB: write-back, count=1 > > I don't think that the hosting company played with the bios settings, > and I don't do anything special with memory.
Alain,
All memory is correctly configured in MTRR it seems (all of it is write-back cacheable).
Do you have CONFIG_HIGHIO=y ? That might help a lot. The kernel has to use bounce buffers for IO otherwise.
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