Page 1 of 4 1 2 3 ... LastLast
Results 1 to 10 of 37
Like Tree1Likes

Thread: Why my eMMC is so slow?

  1. #1
    Soundwave
    Member #
    67340
    Join Date
    Mar 2014
    Tablet
    None
    Posts
    11
    Liked
    1 times

    Why my eMMC is so slow?

    Hi all, this is my first post, i'm italian then forgive any spelling errors.

    This is my problem, i have an Asus t100 32gb model and my memory is so slow,i tried to format multiple times but nothing.

    Bench (Sandisk SEM32G ) :

    immaginepselm.png
    immagine28xevt.png

    a curiosity, my recovery partition was installed in the main disk in fact I had only 7gb free, using asus backtracker I put the recovery partition on a USB key and I recovered the missing 7gb, now I find the 7gb partition in the model by 32gb is designed to recover completely free and usable, very strange.

    immagine31xed4.png

    is a memory usb 2.0, very slow, 28 MB/S read and 5 MB/S write.

    I can request a RMA for the slow memory?

  2. #2
    Ratchet
    Member #
    63516
    Join Date
    Dec 2013
    Tablet
    TF Book T100
    Posts
    105
    Liked
    4 times
    CrystalDiskMark 3.0.3 (C) 2007-2013 hiyohiyo
    Crystal Dew World : Crystal Dew World
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 129.646 MB/s
    Sequential Write : 42.894 MB/s
    Random Read 512KB : 116.857 MB/s
    Random Write 512KB : 24.994 MB/s
    Random Read 4KB (QD=1) : 9.375 MB/s [ 2288.8 IOPS]
    Random Write 4KB (QD=1) : 4.307 MB/s [ 1051.4 IOPS]
    Random Read 4KB (QD=32) : 12.040 MB/s [ 2939.4 IOPS]
    Random Write 4KB (QD=32) : 4.446 MB/s [ 1085.5 IOPS]

  3. #3
    Ratchet
    Member #
    63907
    Join Date
    Dec 2013
    Tablet
    TF Book T100
    Posts
    152
    Liked
    5 times
    -----------------------------------------------------------------------
    CrystalDiskMark 3.0.3 (C) 2007-2013 hiyohiyo
    Crystal Dew World : Crystal Dew World
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 84.440 MB/s
    Sequential Write : 24.875 MB/s
    Random Read 512KB : 72.686 MB/s
    Random Write 512KB : 27.531 MB/s
    Random Read 4KB (QD=1) : 9.733 MB/s [ 2376.1 IOPS]
    Random Write 4KB (QD=1) : 3.185 MB/s [ 777.5 IOPS]
    Random Read 4KB (QD=32) : 16.818 MB/s [ 4106.0 IOPS]
    Random Write 4KB (QD=32) : 3.151 MB/s [ 769.4 IOPS]

    Test : 50 MB [C: 78.2% (22.1/28.2 GB)] (x1)
    Date : 2014/03/25 13:13:18
    OS : Windows 8.1 [6.3 Build 9600] (x86)

  4. #4
    Supporting Member
    Supporting Member

    Member #
    64427
    Join Date
    Jan 2014
    Tablet
    Too lazy to choose
    Posts
    1,249
    Liked
    291 times
    For a 32GB that isn't terribly slow. The 64GB models seem somewhat faster.

    eMMC is slow because generally its accessing the NAND flash through a single channel, unlike a traditional SSD which is accessing the flash through a multichannel controller. So the end result is that, unlike an SSD which is generally using a 4/8 channel design (depending on flash capacity), you have eMMC which is often a single channel...so you get 1/4 to 1/8th the speed of an actual SSD.

    It is still typically much faster than a traditional hard drive at a lot of things, like smaller file access. For example, the 4k results for a typical hard drive would be more like 1MB/sec read and write.

    eMMC has a long way to improve though, but if you look at a lot of eMMC based tablets and phones of just a couple of years ago, those numbers would have been more like 20-30MB/sec reads and 5-10MB/sec writes.

  5. #5
    Ratchet
    Member #
    63907
    Join Date
    Dec 2013
    Tablet
    TF Book T100
    Posts
    152
    Liked
    5 times
    If there is one thing I dont complain about this tablet, its the speed. Cant believe how fast it is.
    SocialCarpet likes this.

  6. #6
    Soundwave
    Member #
    67340
    Join Date
    Mar 2014
    Tablet
    None
    Posts
    11
    Liked
    1 times
    Quote Originally Posted by azazel1024 View Post
    For a 32GB that isn't terribly slow. The 64GB models seem somewhat faster.

    eMMC is slow because generally its accessing the NAND flash through a single channel, unlike a traditional SSD which is accessing the flash through a multichannel controller. So the end result is that, unlike an SSD which is generally using a 4/8 channel design (depending on flash capacity), you have eMMC which is often a single channel...so you get 1/4 to 1/8th the speed of an actual SSD.

    It is still typically much faster than a traditional hard drive at a lot of things, like smaller file access. For example, the 4k results for a typical hard drive would be more like 1MB/sec read and write.

    eMMC has a long way to improve though, but if you look at a lot of eMMC based tablets and phones of just a couple of years ago, those numbers would have been more like 20-30MB/sec reads and 5-10MB/sec writes.
    thanks for the explanation azazel but look here.

    Atto Disk

    immagine1lfxyl.png

    now I'm pretty confused,you might try this test too?

  7. #7
    Supporting Member
    Supporting Member

    Member #
    64427
    Join Date
    Jan 2014
    Tablet
    Too lazy to choose
    Posts
    1,249
    Liked
    291 times
    Not sure what you are confused about. The difference between Crystal disk and ATTO? They run their benchmarks differently.

    The ATTO results you have there are pretty close to what I have for my 64GB model. Though my write numbers peak at about 45MB/sec at about 128k size and smooth down to about 38MB/sec at 8192 (no dips down to 28MB/sec). My read speeds are a hair lower with a peak around 512k size at about 125MB/sec and dropping to about 120MB/sec at 8192k size.

    My 4k speeds are also about 28/28MB/sec for read and write.

    I don't recall exactly what my crystal disk reported speeds were, but pretty close to in line with my ATTO speeds. I think it was around 25/25MB/sec for 4k and around 120MB/sec and 35MB/sec for read and write sequential speeds.

  8. #8
    Soundwave
    Member #
    63051
    Join Date
    Dec 2013
    Tablet
    TF Book T100
    Posts
    13
    Liked
    0 times
    Model: 64 GB (no HDD), 45 GB of free space. CrystalDiskMark 3: 1000 MB x3 test.

    Seq. Read: 136 MB/s
    Seq. Write: 48,48 MB/s
    512K Read: 120,8 MB/s
    512K Write: 48,85 MB/s
    4K Read: 11,5 MB/s
    4K Write: 5,45 MB/s
    4K QD32 Read: 15,9 MB/s
    4K QD32 Write: 6,138 MB/s

  9. #9
    Ratchet
    Member #
    63907
    Join Date
    Dec 2013
    Tablet
    TF Book T100
    Posts
    152
    Liked
    5 times
    32 version, 3 x 1000MB:

    -----------------------------------------------------------------------
    CrystalDiskMark 3.0.3 (C) 2007-2013 hiyohiyo
    Crystal Dew World : Crystal Dew World
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 87.192 MB/s
    Sequential Write : 30.649 MB/s
    Random Read 512KB : 84.563 MB/s
    Random Write 512KB : 14.181 MB/s
    Random Read 4KB (QD=1) : 10.054 MB/s [ 2454.6 IOPS]
    Random Write 4KB (QD=1) : 2.597 MB/s [ 634.1 IOPS]
    Random Read 4KB (QD=32) : 14.151 MB/s [ 3454.8 IOPS]
    Random Write 4KB (QD=32) : 2.359 MB/s [ 575.9 IOPS]

    Test : 1000 MB [C: 76.3% (21.5/28.2 GB)] (x3)
    Date : 2014/03/25 23:13:47
    OS : Windows 8.1 [6.3 Build 9600] (x86)

  10. #10
    Rescue Squad
    Supporting Member

    Member #
    41525
    Join Date
    Jul 2012
    Tablet
    VivoTab Note 8
    Posts
    981
    Liked
    233 times
    Mind that eMMC stands for embedded Multi Media Card, which has more in common with a SD card than a SSD... originally, eMMC was designed for a wide range of applications in consumer electronics, mobile phones, hand held computers, navigational systems and other industrial uses.

    The eMMC specification provides a embedded non-volatile memory system comprised of both flash memory and a flash memory controller, which simplifies the application interface design and frees the host processor from low-level flash memory management, which benefits product developers by simplifying the non-volatile memory interface design and qualification process – resulting in a reduction in time-to-market as well as facilitating support for future flash device offerings. Small BGA package sizes and low power consumption make e.MMC a viable, low-cost memory solution for mobile and other space-constrained products.

    It just has the down side, as azazel1024 pointed out, of having the innate bottleneck of being a single channel, single NAND chip, solution... but that's the trade off for low cost, small space, and low power design that's optimal for mobile devices... This has consequentially made eMMC infamous for being slow, even though it still benefits from the innate benefits of Solid State memory like near instant access times and faster small read/writes...

    However, like all drive technology they have been improving over the years and have started reaching some significant milestones in finally advancing performance to more acceptable levels...

    Bay Trail supports the first such milestone with support for the v4.5 specification for eMMC that introduces things like using RAM like buffering with twice the bandwidth of the drive itself and other improvements... Problem is just having a faster specification doesn't mean every drive will push the new limits and that's why some drives still seem slow, while others may be noticeably faster... It has only been about a year since the v4.5 specification became official and finally started to replace the previous v4.41 specification...

    You can look up the same benchmark scores for Clover Trail tablets to compare and see that on average the eMMC drives in the T100 are much faster than what was available just a year ago...

    While the upcoming Cherry Trail will likely take advantage of the upcoming v5 specification update that pushes the bandwidth a bit higher than SATA 2... So they're continuously improving performance and in another two to three years we might finally see it reach SATA 3 range...

    For now, the performance is at least faster than what you would get from a HDD and you should notice a bit of a improvement with the upcoming Windows 8.1 Update 1 release as it is set to reduce the install size of Windows by a couple of GB... The beta release already shows a standard install difference from about 12.5GB down to less than 10GB with the update... and also introduce performance enhancements that should make the system more responsive overall...

 

 
Page 1 of 4 1 2 3 ... LastLast

Remove Ads

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. the eMMC are defective
    By bgeery in forum Asus Transformer Book T100 General Discussions
    Replies: 25
    Last Post: 02-17-2014, 07:44 AM
  2. Enabling HS200 mode for eMMC to boost the speed?
    By Hendrickson in forum Asus Transformer Book T100 General Discussions
    Replies: 8
    Last Post: 11-28-2013, 03:47 PM
  3. So Slow!
    By kiteman in forum Transformer Pad 300 General Discussion
    Replies: 22
    Last Post: 07-29-2013, 09:43 PM
  4. Browser slow, then fast, then slow
    By rcca in forum Transformer Prime General Discussions
    Replies: 7
    Last Post: 08-09-2012, 01:16 AM
  5. Slow GPS
    By rblw in forum Asus Transformer (TF101) Help
    Replies: 4
    Last Post: 07-01-2011, 05:24 PM
Powered by vBulletin® Version 4.2.3
Copyright © 2022 vBulletin Solutions, Inc. All rights reserved.
Search Engine Optimization by vBSEO 3.6.1
All times are GMT -6. The time now is 02:13 AM.