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Bettering Radeon Gallium3D Performance With PCI-E 2.0

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  • Bettering Radeon Gallium3D Performance With PCI-E 2.0

    Phoronix: Bettering Radeon Gallium3D Performance With PCI-E 2.0

    While it will not take you up to the speeds of the Catalyst driver, besides the 2D color tiling patches, there are a few other outstanding features not yet enabled-by-default in the open-source Radeon graphics driver that can yield some performance boosts. One of these other features is enabling PCI Express 2.0 support within the Radeon DRM.

    http://www.phoronix.com/vr.php?view=16963

  • unknown2
    replied
    i try to enable "radeon.pcie_gen2=1" on 6950, kernel 3.2.2

    but it seems no speed boost, am i missing something?

    Leave a comment:


  • AnonymousCoward
    replied
    Originally posted by HokTar View Post
    Here comes the rational for the renaming: Fusion is already accociated with AMD which is bad for other backers, e.g. ARM. So they simply changed it -- the hardware will come in a few years anyways, so no problem.
    Or maybe this: http://www.techpowerup.com/159096/Ar...rand-Name.html

    Leave a comment:


  • bridgman
    replied
    Originally posted by Drago View Post
    On the topic...can't this PCI-E 2.0 setting being enabled at least for the APUs(Brazos,Llano)? They have internal PCI-E link, so no motherboard involved.
    I don't think the GPU goes through an internal PCIE link so wouldn't expect any performance increase from enabling the option on APUs :

    http://realworldtech.com/page.cfm?Ar...2711124854&p=2

    EDIT - Oops
    Last edited by bridgman; 01-21-2012, 11:18 AM.

    Leave a comment:


  • agd5f
    replied
    Originally posted by Drago View Post
    On the topic...can't this PCI-E 2.0 setting being enabled at least for the APUs(Brazos,Llano)? They have internal PCI-E link, so no motherboard involved.
    This option is irrelevant on APUs since they are not really on the PCIE bus per se. It only applies to discrete cards.

    Leave a comment:


  • HokTar
    replied
    Originally posted by Qaridarium View Post
    sure you can activate this option with an Llano.
    and the Trinity opensource announcements come tomorrow or the day after tomorrow.

    i think they will grow the opensource team and focus on openCL and video acceleration.

    but in fakt the biggest impact will not be in the "trinity" generation because its a VLIW based gpu architecture like the hd6970.

    the successor of trinity will be the one with the greatest open-source impact.
    because then its a hd7970 based gpu.
    Wait!
    This time you actually make sense! For the following reason:
    AMD will switch to FSA (Fusion Systems Architecture), which they renamed yesterday or today to HSA (Heterogeneuos Systems Architecture). This is their new intruction set that is open, meaning that anyone can support it. It's better than Intel's, because they let all supporters to have a voice in it's developement.
    Here comes the rational for the renaming: Fusion is already accociated with AMD which is bad for other backers, e.g. ARM. So they simply changed it -- the hardware will come in a few years anyways, so no problem.

    Now, here's the big news: HSA is an ISA that is an extension of OpenCL.
    So your OpenCL code will run pretty efficiently on these systems.
    The catch is that the architectures for the CPU and GPU part will be fully integrated, will have the same address space, etc. Hence fglrx would be needed for your CPU as well!

    Hordes of Linux users may not give a crap about fglrx today but everybody will be pissed if they can't even boot a live CD without a blob!

    Can you see now why they invest in OpenCL and why would they further increase that?

    +1: HPC industry wouldn't like problematic binary blobs, especially for CPUs. Don't forget that the market share of Linux is about 90% there.

    Edit:
    +2: Have you noticed that there's _no_ patent issues whatsoever with OpenCL?

    /me hoping for the rise of Mesa in the following years!
    Last edited by HokTar; 01-21-2012, 06:39 AM.

    Leave a comment:


  • Drago
    replied
    Originally posted by Qaridarium View Post
    sure you can activate this option with an Llano.
    I meant by default.

    Leave a comment:


  • Qaridarium
    replied
    Originally posted by Drago View Post
    AMD looses some very important point here. Now with not optimal FOSS driver, and since APU initiative, they loose not only GPU sale, but CPU and chipset sales.
    For people that don't care, there is always some Linux geek whom they consult(or just the salesman), and he will tell them "Yes do choose intel, they are flawless"
    I like AMD, but if Trinity fails, I would go intel way.
    On the topic...can't this PCI-E 2.0 setting being enabled at least for the APUs(Brazos,Llano)? They have internal PCI-E link, so no motherboard involved.
    sure you can activate this option with an Llano.
    and the Trinity opensource announcements come tomorrow or the day after tomorrow.

    i think they will grow the opensource team and focus on openCL and video acceleration.

    but in fakt the biggest impact will not be in the "trinity" generation because its a VLIW based gpu architecture like the hd6970.

    the successor of trinity will be the one with the greatest open-source impact.
    because then its a hd7970 based gpu.

    Leave a comment:


  • Drago
    replied
    AMD looses some very important point here. Now with not optimal FOSS driver, and since APU initiative, they loose not only GPU sale, but CPU and chipset sales.
    For people that don't care, there is always some Linux geek whom they consult(or just the salesman), and he will tell them "Yes do choose intel, they are flawless"
    I like AMD, but if Trinity fails, I would go intel way.
    On the topic...can't this PCI-E 2.0 setting being enabled at least for the APUs(Brazos,Llano)? They have internal PCI-E link, so no motherboard involved.

    Leave a comment:


  • ryszardzonk
    replied
    Originally posted by whizse View Post
    So what are the plans for using pcie_gen2=1 by default? Couldn't the incompatible motherboards be blacklisted instead of turning it off for everyone?
    my thoughts exactly. Sam goes for Intel RC6 and others just like they went with ASPM

    Leave a comment:

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