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Btrfs File-System For Old Computers?

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  • #16
    Originally posted by devius View Post
    Got to dust off my trustworthy 486DX2-66 to see what a really old computer can do
    It would be nice to see some real world tests done by a human, like time to compress a file(s), boot time, application start-up time... you know, stuff that actually matters.
    With DX2 you could run just DOS and Windows 95, Windows 98 will not run if you don't have at least 16 M of RAM, and NT 4 will not run without 24 M of RAM.
    You're right about what should be counted as real stuff. Did you noticed: "auto-defrag" behaved bad, because auto-defrag is the way it is used today for a desktop system. Why it was not a fragmenter test done before to simulate disk usage!
    But in the last time did you noticed a relevant benchmark so far running here? Made by a good methodology? Not being either spectacular journalism, like showing off a new hardware feature (like OpenGL 3.0 in a benchamark based on a driver support) or a software feature (adding LLVM to Mono could speedup in some benchmarks), either too deep in what results means.

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    • #17
      Originally posted by ciplogic View Post
      Windows 98 will not run if you don't have at least 16 M of RAM,

      It would run on 8 megs if you used the /nm install option.

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      • #18
        Originally posted by TeoLinuX View Post
        Does the PowerMac G4 push OS X?
        I learned something new!
        I believed it worked only on x86 machines. I've never been a mac user and Wikipedia busted my false belief
        --> it worked on it until Leopard 10.5 wow

        any mac user can tell whether it chokes the hardware, or is it responsive? Leopard on a G4, I mean
        Depends on the version, 10.4 runs allot better then 10.5 does, can't justify upgrading the CPU from a single "Apollo 6" 7455/G4e 800Mhz to a dual CPU "Apollo 8" 7448 1.8Ghz(not dual core, 2x CPU on a daughter card), and flash a PC ATI FireGL X3 AGP with the ROM off a Mac X800XT. Could go with a 7800GS AGP with the rom off a Mac Nvidia 7800GT, but since the only GPU drivers for PPC Macs are the OSS ones the X800 will run much better under Linux then the 7800.

        I have more issues with more modern software that is poorly ported, though you get a few gems like the unofficial port of Firefox, TenFourFox, which has builds for several PowerPC CPUs.

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        • #19
          Originally posted by oliver View Post
          A core2duo isn't old! Now a 4500 (or was it 4200?) RPM ide laptopdrive, now that is old!

          (Typing this from a T42 with a ide disk)

          I'm a little bummed that the most important 'safety' option has such a huge impact on performance Hopefully this will be fixed soon, as I'm going to be using this laptop for hopefully 2-3 more years.
          I have the same exact Thinkpad as well with a 60GB disk and 2GB RAM and a very dependable machine I'd also like to keep for a few more years so its good to see btrfs would be at least fairly usable on a machine like this one and hopefully the right optimizations can be found for a machine of this caliber so that btrfs can be a better FS

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          • #20
            Originally posted by deanjo View Post
            It would run on 8 megs if you used the /nm install option.
            If 30 real-time minutes are acceptable. I remember quite good how 486sx with 4mb of ram started warcraft 2 with min requirement of 8mb ram overcome via running w3.1 with swapping. Dos4gw swapping didn't work at all.

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            • #21
              Originally posted by deanjo View Post
              Data loss.
              Barriers are being phased out. They turned out not to be worth the cost. Individual filesystems can accomplish the same thing with less cost simply by making the right calls at the right times.

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              • #22
                Originally posted by drag View Post
                It depends on what you want. For some people running 'noatime' is unacceptable because the atime is data that is valuable for their specific purpose.

                Btrfs is going to be a bit slower then Ext4 generally. Ext4 is a very fast FS, despite what the naysayers think. Especially when it comes to pure database purposes... the database uses directio which is something ext4 can be fantastic at...

                That being said due to the features and extra levels of protection btrfs can offer then it's probably worth it to use it in the future. When btrfsck comes out then I will start taking btrfs more seriously.
                You're spot on about ext4 being a very performant fs (at least, potentially). That is the reason, I would hazard, that Google hired T'so. A lot of his work has been targeted at making ext4 scale to extremely large file systems, and it's paying off for everyone.
                As for data protection, although ext4 doesn't protect the data as strongly as zfs/btrfs (again, potentially), it does provide fairly strong protection to the journal which, while should make it harder for the system to become corrupted (if performance isn't important I guess you could make the journal writethrough and that should provide additional data guarantees). Additionally, it has an online defragger, but as it is experimental, I've been hesitant to try it, but it should help keep to maintain performance over machines with very long uptimes.
                If you want data guarantee this paper (http://www.google.com/url?sa=t&rct=j&q=ext4%20data%20checksum&source=web &cd=4&ved=0CDgQFjAD&url=http%3A%2F%2Fpages.cs.wisc .edu%2F~bpkroth%2Fpapers%2Fext4parity.pdf&ei=yGi8T qvrL-n40gHrtMnABA&usg=AFQjCNEWwXXtsREjCYjMCQYa65S9GZFp1 A&cad=rja) indicates that changes to the MD layer should provide the type of data guarantees zfs has while maintaining the separation of duties of a file system driver from the io layer.
                Regarding btrfs being slow it SEEMS as if it would only be slow when writing, but due to the extra work involved with finding good layout schemes when writing, reading should be quite fast. I'd be interested in seeing the some phoronix benchmarks of a mostly full fs when using both btrfs and ext4.

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