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    Samsung 830 very low random write IOPS on XPS17 L702X

    Discussion in 'Dell XPS and Studio XPS' started by ThisNoName, Aug 2, 2012.

  1. ThisNoName

    ThisNoName Notebook Enthusiast

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    XPS17 L702X, Firmware A17, BIOS SATA ACHI set.

    Single Samsung 830 128GB SSD, fresh Windows 7 installation, plus all Dell drivers.

    Samsung magician software, latest firmware, OS and drive optimization. Then running performance test. Sequential read/write show exactly as advertised speed (500/300).

    But when it comes to random IOPS, it gets much lower. Read is 50K out of 80 spec and write, 14K out of 30K spec!

    14tofo3.jpg

    Does this look too low? Is there any driver I might miss? The only thing I can think of is in the IDE ATA/ATAPI controllers, they are like:

    ATA Channel 0
    ATA Channel 1
    ATA Channel 4
    ATA Channel 5
    Standard AHCI 1.0 Serial ATA Controller.

    Is there newer driver than 1.0?


    Also, when I drag a large file onto the drive, it copied at ~40M/sec. As a comparison, the 7200RPM drive that came with the laptop, in a cheap USB 3.0 enclosure can sustain 80-100M/sec write!

    Any ideas? Thanks.
     
    ThisNoName, Aug 2, 2012
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  2. letmeknov

    letmeknov Notebook Consultant

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    letmeknov, Aug 2, 2012
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  3. ThisNoName

    ThisNoName Notebook Enthusiast

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    Thanks. I already did most of the tweaks before hand, so can't tell exactly how much they affect performance. The turn off write flush policy increase random write IOPS by just a hair.

    Intel driver bumps both random IOPS by a bit as shown. I guess you have a 256G drive, so I can't get any better than this.
    Noname.jpg

    The only thing bothers me is that the half random IOPS write we got compare to spec. Shouldn't we have at least 20-25K when we paid for 30-36K?
     
    ThisNoName, Aug 2, 2012
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  4. ThisNoName

    ThisNoName Notebook Enthusiast

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    Still slow in real life.

    Dragging a 4GB+ VMWare directory, consisting a few 2G files, from an external USB 3.0 HDD, average speed 35MB/sec?! Dragging the same directory back to USB 3.0HDD, average 90MB/sec.

    What else do I miss? Or we all have been had by the SSD hype :mad2:
     
    ThisNoName, Aug 2, 2012
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  5. ThisNoName

    ThisNoName Notebook Enthusiast

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    Even with the new driver, slight improved random access time and seemingly fast sequential speed, when I drag and drop a large file onto the SSD, it only copies at 20-30M/sec, either with Windows' default copy or Teracopy.

    This seems really slow, even compare to regular drive over USB. Can someone shed some light? Thanks
     
    ThisNoName, Aug 4, 2012
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  6. spidey180

    spidey180 Notebook Enthusiast

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    Low scores are due to power saving features which are enabled! To disable those ;download the modded BIOS available on this forum for your laptop and then in the BIOS disable C6 states in the CPU-control sub menu. Your scores will shoot up!!
    Hope this helped!

    DO BIOS MODDING AT YOUR OWN RISK, READ ALL THE INSTRUCTIONS IN THE THREAD!!
     
    spidey180, Aug 7, 2012
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  7. ikjadoon

    ikjadoon Notebook Deity

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    Make sure the SSD is aligned, too. My SSD wasn't. You can check with AS SSD; it should read out in the "info text box" xxxxK - OK".

    Aligning my SSD drastically increased my performance.
     
    ikjadoon, Aug 7, 2012
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