My thread on this in LKML
I have created a thread on this in LKML right there:
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Ubuntu 32-bit, 32-bit PAE, 64-bit Benchmarks
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Originally posted by caramerdo View PostSo is it a 64 bit kernel on 32 bit userland or a 64 bit kernel with 64 bit userland? That makes a world's difference.
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So is it a 64 bit kernel on 32 bit userland or a 64 bit kernel with 64 bit userland? That makes a world's difference.
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Originally posted by Kano View Post@xeros
Your bios has to support remapping too.
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BTW, the article says that the system used for testing has 4GB of RAM, was that with memory mapped over the 4GB line or not? If in doubt, look at the beginning of the dmesg for the e820 map, and look for memory mapped above 0x100000000. This is a detail particularly important for DMA to devices.
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I've just tested PAE enabled kernel in Kubuntu 9.10 on P4 3GHz (32bit only) with HT and 3GB RAM physical (2,5-2.7GHz logical mapped by BIOS) and I didn't get more logical RAM with PAE - it's the same as without PAE but it looks like running from BIOS to... KDE 4.4b2 (two instances run by two users) takes at least few seconds more with PAE (I haven't measured that precisely).
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I think there is an error in the article, HIGHMEM_4G enables highmem but not PAE. Only HIGHMEM_64G will enable PAE. HIGHMEM_4G performance hit is measurable in some cases, but only significant if the work dataset is larger than lowmem.
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Originally posted by clavko View PostI know it all gets down to
out-of-box experience, but AnandTech took the same route with battery
tests and it didn't bode well for GNU/Linux. At all.
Cheers!
We were left with running the proprietary fglxr 8.600 driver, and while it worked fine in general we had problems with DVD playback. VLC repeatedly crashed during our benchmarks, sometimes after a few minutes, sometimes after 50 minutes. Eventually, we decided to uninstall the proprietary ATI driver and test out the open-source MESA driver. Surprisingly, the open-source driver actually provided a better experience.
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Originally posted by linuxjacques View PostCan anyone explain the results of the 64-bit Postmark test?
I think the explanation of the Apache test results is related.
My sheevaplug with a tuned apache easily outperforms that CD2 in 32bit mode...
Another slight problem with this (local) ab test is that basically one core is lost to ab itself.
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