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  • #16
    Originally posted by BlackStar View Post
    You are mistaken: ffmpeg-mt allows 1080p decoding on Athlon X2 CPUs. This is simply not possible with single-threaded ffmpeg.

    Other than that, no it doesn't offer much
    I just said that it would require building against ffmpeg-mt (which is NOT part of the official MythTV tree), re-read the reply. Even ffmpeg-mt has a hard time decoding medium to high bitrate 1080p 264 on a dual core especially if any filtering is to be done as well.

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    • #17
      Like the others says on this thread: planing/care to play 1080p content? if not, you can get less powerfull system, like, not-too-powerful AMD CPU and onboard ATI (3200?) GPU; or not-too-powerful intel CPU with intel newer (3x or 4x, but not GMA500) GPU.

      If you care about 1080p content, then get not-too-powerful CPU and an NVidia chipset.


      OK, I'll try to sum it up:
      get the NVidia ION platform

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      • #18
        Well when you get a 3 ghz cpu for less than 100 bucks then you have got optimal h264 decoding AND system speed. Those low speed Atom CPUs are stupid as a new cpu can use Speedstep/Powernow to save energy too in idle mode. That just does not work when you oc it with increased Vcore (over fsb 400 i even needed to disable EIST completely). I did not try a 2.8 ghz cpu, but i would choose something like Pentium E6300 and oc it a bit if needed. A cheap G43 would be enough, maybe even G41 but then you could not oc so well (also it does not support AHCI mode for hd).
        Last edited by Kano; 06-27-2009, 05:11 AM.

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        • #19
          @Kano
          For speed, yes, choose something like you've said. But if it's main purposes for htpc, then I still suggest an ION platform. With underclocking and undervolting, estimated power consumption's still quite big. Not to consider it's size

          http://en.expreview.com/2009/06/26/z...eviewed.html/6

          ^^^ something that I accidentally meet when digging information. Too bad, still use fan for cooling.

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          • #20
            Originally posted by t.s. View Post
            @Kano
            For speed, yes, choose something like you've said. But if it's main purposes for htpc, then I still suggest an ION platform. With underclocking and undervolting, estimated power consumption's still quite big. Not to consider it's size

            http://en.expreview.com/2009/06/26/z...eviewed.html/6

            ^^^ something that I accidentally meet when digging information. Too bad, still use fan for cooling.
            Given MythTV (which is his application that he wishes to use) is usually used for it's PVR capabilities, an atom just isn't up to the task. A nice low powered dual core+ AMD or intel desktop CPU coupled with a nvidia chipset board or separate nvidia vdpau card however would allow watching and playback of even HD content with ease. You also can slap on one of the many super silent CPU coolers to further cut back noise. With a atom board you really don't have a choice (and those little fans are noisy little bastards).

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            • #21
              Kano, why would AHCI mode be needed? I'm in the understanding that it is only for the case where a native driver does not exist, and provides similar speed as a native driver. At least on my mobo it has the huge con that enabling it causes a ~10 second delay to bios boot, and since there's a native SATA driver, I've kept AHCI off.

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              • #22
                Originally posted by Jeff8086 View Post
                I'm hoping the AMD drivers get better, but when your friends come over they aren't going to care about ideological crap... they will just see a bad product.
                ...
                If you aren't going to play any games whatsoever then just stick with integrated intel chip(except for the GMA 500 as noted above), or go with NVidia.
                I agree, currently the only way to get the most out of ATi cards is getting a recent Windows... :/ (could as well blame the whole community for not pulling together a unified future-proof video accel standard; Microsoft's DXVA seems to have gotten much more planning than the Linux equivalents)
                But yeah, will very likely change (with Gallium3D which'll give not only OpenGL but also VDPAU) but not in very near future.

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                • #23
                  Originally posted by curaga View Post
                  Kano, why would AHCI mode be needed? I'm in the understanding that it is only for the case where a native driver does not exist, and provides similar speed as a native driver. At least on my mobo it has the huge con that enabling it causes a ~10 second delay to bios boot, and since there's a native SATA driver, I've kept AHCI off.
                  AHCI is more then a driver for when " native driver does not exist". It is a standardized method for detecting, configuring sata devices as well it also allows for hot-plugging and ncq where that maybe desirable in a HTPC. (Swapping of HD's and recording multiple streams at once.)

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                  • #24
                    My front end is probably going to start off as an Asrock ION machine.
                    It'll decode anything and I have no HD content yet

                    question for deanjo: I've just got that Biostar board I was talking about and I have three SATA drives attahced and an IDE DVD-RW.

                    It has many "modes", including Native IDE and AHCI.

                    I was always under the impression that AHCI is the best to use and highest performance.

                    (Although SATA channels 1-4 disappear from the BIOS using AHCI and two of the HDDs appear as IDE drives, the drive on SATA5 appears as a SATA drive)

                    Using linux soft RAID5 on three 500GB WD SATA drives, bonnie++ numbers were all <=60MB/S.

                    I know RAID5 is not a performance option but I like the balance it gives you. However, it seems a bit slow.

                    Anyway, completely OT but it's my T to go O from.

                    J.

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                    • #25
                      <=60MB/s looks about right for your drives on soft RAID5 (expect a 10-20MB/s improvement on JBOD at the best case).

                      What are you going to do on a HTPC that requires >60MB/s anyway?

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                      • #26
                        Originally posted by RoboJ1M View Post
                        My front end is probably going to start off as an Asrock ION machine.
                        It'll decode anything and I have no HD content yet

                        question for deanjo: I've just got that Biostar board I was talking about and I have three SATA drives attahced and an IDE DVD-RW.

                        It has many "modes", including Native IDE and AHCI.

                        I was always under the impression that AHCI is the best to use and highest performance.

                        (Although SATA channels 1-4 disappear from the BIOS using AHCI and two of the HDDs appear as IDE drives, the drive on SATA5 appears as a SATA drive)

                        Using linux soft RAID5 on three 500GB WD SATA drives, bonnie++ numbers were all <=60MB/S.

                        I know RAID5 is not a performance option but I like the balance it gives you. However, it seems a bit slow.

                        Anyway, completely OT but it's my T to go O from.

                        J.
                        Running linux softraid 5, your numbers look about normal, although from my experience with raid 5 on nforce mb's is that your best performance is not through linux's softraid but actually using the mb's fake raid setup and dmraid. Write performance for linux's softraid 5 is pretty dismal. Using the exact same setup options on both the software raid and the dmraid, dmraid quite literally slaughtered in performance. The same 3 drives with software raid would give you about ~65MB/S sustained reads and ~30 MB/s sustained writes. Switching it to use the bios raid and dmraid those numbers would jump to ~ 105 MB/s sustained reads and ~90 MB/s sustained writes.

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                        • #27
                          Hi,

                          Apparently there is lots and lots of things to tune in RAID5.
                          getra and setra, changes the read ahead.

                          I (think) I'm looking at ~100MB/s with the read ahead bumped from 256 to 16384 (not yet sure whether that's KiB or b or MiB yet, it was just a brief stab before I went to bed)

                          Apparently this can have a detrimental affect on random read. Although iozone doesn't appear to think so. Not sure yet, lots of numbers hurt my eyes.

                          Anyway, task one is to learn iozone and how to digest it's info barf.

                          Regards,

                          J1M.

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                          • #28
                            Originally posted by BlackStar View Post
                            <=60MB/s looks about right for your drives on soft RAID5 (expect a 10-20MB/s improvement on JBOD at the best case).

                            What are you going to do on a HTPC that requires >60MB/s anyway?
                            Not for the HTPC, it's for the server

                            And that's going to be running several paravirtualized servers over XenServer. :P

                            J1M.

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