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Thread: Ubuntu 11.04: i686 vs. i686 PAE vs. x86_64

  1. #31
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    The article only showed that 64 USERSPACE is faster!!! You gain absolutely nothing with 32 bit userspace!

  2. #32

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    Quote Originally Posted by Kano View Post
    The article only showed that 64 USERSPACE is faster!!! You gain absolutely nothing with 32 bit userspace!
    My original post was how I'd like to see some benchmarks that would actually test what the effect of the PAE vs 64 bit kernel was. All the article shows is as you say, that 64 bit kernel + 64 bit userland is faster. This isn't news. I was curious about whether the 64 bit kernel was any faster than a 32 bit kernel w/ PAE while keeping everything else the same (i.e., no userland changes).

  3. #33
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    Also the article is not completely optimal for compareing as ubuntu uses different CONFIG_HZ settings for generic/server and 32 vs 64 bit kernels. Basically you need a kernel with 100% the same settings.

  4. #34
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    Ubuntu is not a performance oriented distro. It is a distro that is supposed to be user friendly for people that don't know how to maintain/use a linux system or don't want to be bothered by doing so. Right now the friendliest and most trouble free version of linux on x86 is 32 bit. Canonical isn't likely to change their recommendation to use the 32 bit version any time soon no matter what the performance numbers look like.

  5. #35
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    Quote Originally Posted by eikenberry View Post
    My original post was how I'd like to see some benchmarks that would actually test what the effect of the PAE vs 64 bit kernel was. All the article shows is as you say, that 64 bit kernel + 64 bit userland is faster. This isn't news. I was curious about whether the 64 bit kernel was any faster than a 32 bit kernel w/ PAE while keeping everything else the same (i.e., no userland changes).
    A 64 bit system with 32bit userland apps isn't likely to be faster as there is additional overhead translating calls from 32 to 64 bit.

  6. #36
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    Quote Originally Posted by Uqbar View Post
    First of all, some of the main and most popular third party software don't have 64bit support. Skype, Adobe Reader,
    So you are the one person using Adobe Reader on Linux!

  7. #37
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    Quote Originally Posted by Awesomeness View Post
    So you are the one person using Adobe Reader on Linux!
    Nope he isn't the only one. At least with Adobe reader I can fill in Adobe forms, it gets print orientation right and produces a better print job (the dithering is horrible on print outs on the free solutions).

  8. #38
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    As anybody can see, on average there is actually slight improvment in terms of performance on PAE-enabled systems. But I would attribute this to the fact that system have then a bigger filesystem cache. To really show how it affects perfrormance, one would need to perform tests on 2GB system. Anyway, nice it works good, especially, as I use PAE because of Xen.

  9. #39
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    Default Nexuiz 64-bit

    Yes, Nexuiz does include 64-bit binaries.

  10. #40
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    I know ubuntu targets newbies but people who are likely going to try ubuntu arenít going to be xenophobes. Their going to have some understanding as to what 32 and 64 bit are and assume that if ubuntu is recommending 32 bit its going to suffer 64 bit issue on the scale windows did.

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