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Per Lindholm

Per Lindholm

  • Linux.com Member
  • Posts: 18
  • Member Since: 21 May 09
  • Last Logged In: 06 Sep

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  • Per Lindholm
    Linux MOOC ?
    With the popularity of MOOC's shouldn’t there be a Linux MOOC for beginners. Apart from the things you want to teach beginners. It could be fun for them if they express their creative side on assignments in the Libre office suit.
    Link to this post 27 Oct 13

    With the popularity of MOOC's shouldn’t there be a Linux MOOC for beginners. Apart from the things you want to teach beginners. It could be fun for them if they express their creative side on assignments in the Libre office suit.

  • Per Lindholm
    RE: Troubleshooting, limit speed of USB3 device on USB2 computer.
    Searched around a little and found the Supertalent USB 3.0 Express RC8. It has a SSD controller. Im happy to see that they also posted the USB2 benchmark. It seem to max out the USB2 port at over 35 MB/s even for small files which is what I wanted in the first place. So I guess you need to select more carefully among the cheap memorysticks even if you only have a USB2 port.
    Link to this post 16 Mar 12

    Searched around a little and found the Supertalent USB 3.0 Express RC8. It has a SSD controller. Im happy to see that they also posted the USB2 benchmark. It seem to max out the USB2 port at over 35 MB/s even for small files which is what I wanted in the first place. So I guess you need to select more carefully among the cheap memorysticks even if you only have a USB2 port.

  • Per Lindholm
    RE: Troubleshooting, limit speed of USB3 device on USB2 computer.
    I did the same tests with a 11.5GB file. RAID0 was not necessary, an ordinary volume with FAT or NTFS got the same results. Due to some update? I don't know. However the transfer of 1000+ music or image files were crippled, below 5MB/s. I don't have USB3 on this computer. Could you check the average speed you get when copying a folder with 1000+ images. Because of the many problems with flash memory sticks I wonder if its not better to abandon them as a recommended portable storage for larger devices. Now that we have SSD that are dropping in price couldn't we just buy SSD's in the form of a memory stick? I kind of liked but haven't tested those dual eSata/USB interface SSD that looks like memory sticks. If they perform well and get cheaper we could easily spread the use of Linux through teaching a detachable dualboot configuration.
    Link to this post 16 Mar 12

    I did the same tests with a 11.5GB file. RAID0 was not necessary, an ordinary volume with FAT or NTFS got the same results. Due to some update? I don't know. However the transfer of 1000+ music or image files were crippled, below 5MB/s. I don't have USB3 on this computer. Could you check the average speed you get when copying a folder with 1000+ images.

    Because of the many problems with flash memory sticks I wonder if its not better to abandon them as a recommended portable storage for larger devices. Now that we have SSD that are dropping in price couldn't we just buy SSD's in the form of a memory stick?

    I kind of liked but haven't tested those dual eSata/USB interface SSD that looks like memory sticks. If they perform well and get cheaper we could easily spread the use of Linux through teaching a detachable dualboot configuration.

  • Per Lindholm
    RE: Troubleshooting, limit speed of USB3 device on USB2 computer.
    [Possibly closer to a solution] For the fun of it I made a RAID0 volume of two 15GB partitions both on the 32GB USB3 memorystick. ( Use mdadm ). This seems to have solved the speed problem. I got a mean speed of 31MB/s write and 35MB/s read on the USB2 port. The file was over 4GB. Any thoughts why?
    Link to this post 15 Mar 12

    [Possibly closer to a solution]

    For the fun of it I made a RAID0 volume of two 15GB partitions both on the 32GB USB3 memorystick. ( Use mdadm ). This seems to have solved the speed problem. I got a mean speed of 31MB/s write and 35MB/s read on the USB2 port. The file was over 4GB.

    Any thoughts why?

  • Per Lindholm
    RE: Troubleshooting, limit speed of USB3 device on USB2 computer.
    If you look at the graph you see that write isnt stable. From 35MB/s down to 1 MB/s. What I would like to do is to limit the speed somehow to see at what speed it is stable.
    Link to this post 22 Jan 12

    If you look at the graph you see that write isnt stable. From 35MB/s down to 1 MB/s. What I would like to do is to limit the speed somehow to see at what speed it is stable.

  • Per Lindholm
    RE: Troubleshooting, limit speed of USB3 device on USB2 computer.
    I think its accurate the result with file copy gets the same mean speed. Could you help me with usbnet driver under debian squeeze. I don’t know how to get usb0.
    Link to this post 21 Jan 12

    I think its accurate the result with file copy gets the same mean speed. Could you help me with usbnet driver under debian squeeze. I don’t know how to get usb0.

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