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  1. #11
    Avatar von Thomas4711
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    ReceiverDanke
    Ist ein internationales Forum in dem wir hauptsächlich deutsch sprechen aber auch versuchen englischsprachige Anfragen zu beantworten, Ist auf alle Fälle besser als durch Googletranslator übersetzte Anfragen.

    Das wichtige dieses Threads steht in deutsch hier

    p.s. Ich zB bin Wiener
    Geändert von Thomas4711 (26.07.2014 um 16:58 Uhr)

  2. Thanks - bedankten sich
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  3. #12
    Avatar von zeini
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    ReceiverDanke
    Box 1:
    Zgemma H9.Twin
     
     
    Box 2:
    Edision Optimuss OS1+
     
     
    Box 3:
    Golden Interstar XPEED LX1
     
     
    Box 4:
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    Box 5:
    AX HD60
     
     
    Zswap wurde aber erst in Linux 3.11 implementiert.
    In Wikipedia kann man nachsehen, was da gemacht wird. Allerdings nur in der englischen Ausgabe.
    ______________________
    Hans

    TV - Hisense Ulra HD
    Eutelsat 13°E und Astra 19,2°E Unicable-Matrix mit Wide-LNB


  4. Thanks Thomas4711 bedankten sich
  5. #13
    Senior Mitglied Avatar von gorski
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    ReceiverDanke
    So, no explanation of the meaning and function of ZSWAP, as well as the difference of ZSWAP and SWAP, please?

    Why limiting RAM even more? What do we get as an advantage?

  6. #14
    Senior Mitglied Avatar von gorski
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    ReceiverDanke
    I wrote after Hans...

    https://en.wikipedia.org/wiki/Zswap

    zswap is a Linux kernel feature providing a compressed write-back cache for swapped pages. Instead of moving memory pages to a swap device when they are to be swapped out, zswap performs their compression and then stores them into a memory pool dynamically allocated inside system's RAM. Later writeback to the actual swap device is deferred or even completely avoided, resulting in a significantly reduced I/O for Linux systems that require swapping; the trade-off are additional CPU cycles required for compression.[1][2][3]
    As a result of reduced I/O, zswap offers advantages for various devices using flash-based storage, including embedded devices, netbooks and similar low-end hardware devices, as well as other devices using SSDs for storage. Flash memory has a limited lifespan due to its nature, so avoiding its usage for providing swap space prevents it from wearing out quickly.[4]
    These devices of ours have flash memory, so "Flash memory has a limited lifespan due to its nature, so avoiding its usage for providing swap space prevents it from wearing out quickly." Should we abolish zswap?

  7. #15
    Avatar von Thomas4711
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    ReceiverDanke
    When you follow the link from zeini you find the WIKI with description
    zswap is a Linux kernel feature providing a compressed write-back cache for swapped pages. Instead of moving memory pages to a swap device when they are to be swapped out, zswap performs their compression and then stores them into a memory pool dynamically allocated inside system's RAM. Later writeback to the actual swap device is deferred or even completely avoided, resulting in a significantly reduced I/O for Linux systems that require swapping; the trade-off are additional CPU cycles required for compression.[1][2][3]
    As a result of reduced I/O, zswap offers advantages for various devices using flash-based storage, including embedded devices, netbooks and similar low-end hardware devices, as well as other devices using SSDs for storage. Flash memory has a limited lifespan due to its nature, so avoiding its usage for providing swap space prevents it from wearing out quickly.[4]

  8. #16

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    ReceiverDanke
    In older kernels this is called compcache or ramzwap. The idea of this sounds nice but in my opinion it is not. You steal a lot of mem from the OS to provide space for compression. If you need swapping you normally have overstuffed your device it maybe better to reduce stuff.

    On sh4 for example you have about 30MB of free RAM using them for zwap means stealing all free ram ending in "SWAPPING" all time. In case of zwap this lowers your CPU speed.

    Or buy a box with more RAM. Nobody serious buys a fiat 500 (Bambino) to transport his luxury yacht and complains the dealer being overstuffed .

    Gesendet von meinem Nexus 4 mit Tapatalk

  9. Thanks buc61b bedankten sich
  10. #17
    Avatar von zeini
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    ReceiverDanke
    Box 1:
    Zgemma H9.Twin
     
     
    Box 2:
    Edision Optimuss OS1+
     
     
    Box 3:
    Golden Interstar XPEED LX1
     
     
    Box 4:
    Spycat
     
     
    Box 5:
    AX HD60
     
     
    Explain in small word.
    Zswap is not really a swap. It compressed only data in RAM. It means "zipped RAM".
    Swap is an extern medium, there RAM would be outsorced if it is to small.
    ______________________
    Hans

    TV - Hisense Ulra HD
    Eutelsat 13°E und Astra 19,2°E Unicable-Matrix mit Wide-LNB


  11. #18

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    ReceiverDanke
    Japp but you need RAM for compression too . You need some tables for loosless compressors and you need RAM to store stuff at. The more compression rate the more CPU is normally needed. Strip down your memory eaters to get rid of the root cause. Have you ever tried to compress jpgs in zip? In most cases the result is bigger than before

    Gesendet von meinem Nexus 4 mit Tapatalk

  12. Thanks Owen Hart, gorski bedankten sich
  13. #19
    Avatar von Captain
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    ReceiverDanke
    128 MB Ram ist halt nicht viel, wenn schon Image Backup und co Fehler machen wegen low men und schon ist box tot, mit den zswap lebt box halt weiter auch wenn der User kein USB Swap hat

    und klar kostet das CPU ist aber immer die Waage was ist für den Normalen User besser.


    openATV we are open Source

    Boykott GPL violator

  14. #20
    Senior Mitglied Avatar von gorski
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    ReceiverDanke
    I reported streaming that causes a deep freeze, over the home network playback which slows everything down etc.

    So, yes, this image needs a proper streamlining, it seems...


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