VirtualBox

Changes between Version 7 and Version 8 of Ticket #16677


Ignore:
Timestamp:
04/21/2017 08:06:59 AM (3 years ago)
Author:
frank
Comment:

Legend:

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  • Ticket #16677 – Description

    v7 v8  
    99hdparm -a0 /dev/sda 
    1010}}} 
    11  seems to do the same as  
     11seems to do the same as  
    1212{{{ 
    1313# echo 0 > /sys/class/block/sda/queue/read_ahead_kb 
     
    1818 1. get archlinux-2017.03.01-dual.iso  (or any current/latest iso, BUT then the dd repro will most likely not work at the same 'skip'!) 
    1919 
    20 However according to this comment from frank https://www.virtualbox.org/ticket/15281#comment:8 , I shouldn't be posting any such links here, but then reproducing this(with accuracy) is going to be really hard without them, so I'm going to be obscuring them with base64, hopefully that's a good compromise between not posting them and posting them... 
    21  
    22 Pick a download location(476.0 MB): 
    23  
    24  
    25 archlinux webpage with torrent/magnet links, located here: 
    26  
     20 However according to this comment from frank https://www.virtualbox.org/ticket/15281#comment:8 , I shouldn't be posting any such links here, but then reproducing this(with accuracy) is going to be really hard without them, so I'm going to be obscuring them with base64, hopefully that's a good compromise between not posting them and posting them... 
     21 
     22 Pick a download location(476.0 MB): 
     23 
     24 
     25 archlinux webpage with torrent/magnet links, located here: 
    2726{{{ 
    2827aHR0cHM6Ly93d3cuYXJjaGxpbnV4Lm9yZy9yZWxlbmcvcmVsZWFzZXMvMjAxNy4wMy4wMS8= 
    2928}}} 
    3029 
    31 (my)google drive, directory with the iso file: 
    32  
     30 (my)google drive, directory with the iso file: 
    3331{{{ 
    3432aHR0cHM6Ly9kcml2ZS5nb29nbGUuY29tL29wZW4/aWQ9MEI2UC05VXlKRmp6S1ZsWkhUa1E0YUZWbGRUUQ== 
    3533}}} 
    3634 
    37 sha1sum for that iso is: 
    38  
     35 sha1sum for that iso is: 
    3936{{{ 
    4037f426866ca632a35a3eeae8e4080cff25ec8da614  archlinux-2017.03.01-dual.iso 
     
    4239 
    4340 2. get my VM 
    44 the reproduction steps only work with my VM with that specific vdi file; if that vdi gets cloned(even if to same format: vdi) it will not reproduce anymore! The IDE CD repro. steps will still work and make it hang reliably though (see 'next section') 
    45  
    46 Pick one download location(1.9G): 
    47  
    48  
    49 dropbox: 
    50  
     41 the reproduction steps only work with my VM with that specific vdi file; if that vdi gets cloned(even if to same format: vdi) it will not reproduce anymore! The IDE CD repro. steps will still work and make it hang reliably though (see 'next section') 
     42 
     43 Pick one download location(1.9G): 
     44 
     45 dropbox: 
    5146{{{ 
    5247aHR0cHM6Ly93d3cuZHJvcGJveC5jb20vc2gvaHFiMGIwNDB4aTYyMDN2L0FBRE50RVF5Z0tGU1duNnpRaDNZS1VVcmE/ZGw9MA== 
    5348}}} 
    5449 
    55 (my)google drive: 
    56  
     50 (my)google drive: 
    5751{{{ 
    5852aHR0cHM6Ly9kcml2ZS5nb29nbGUuY29tL2RyaXZlL2ZvbGRlcnMvMEI2UC05VXlKRmp6S1Rrc3lZM0pZWlhSbU1Xcz91c3A9c2hhcmluZw== 
    5953}}} 
    6054 
    61 download these 3 files: 
    62 ''arch3.vbox 
    63 arch3.vdi 
    64 checksums'' 
    65  
    66 md5,sha1,sha256 and sha512 for those two are: 
    67  
     55 download these 3 files: ''arch3.vbox, arch3.vdi, checksums'' 
     56 
     57 md5,sha1,sha256 and sha512 for those two are: 
    6858{{{ 
    69591aa8124771fd7c8761435ff26ee2d55b  ./arch3.vbox 
     
    8070 3. TODO: "import" the .vbox somehow in the VirtualBox UI! (export/import wouldn't have worked because it clones my vdi; and imports it as vmdk) 
    8171 4. ensure 'Controller: IDE' has 'Use Host I/O Cache' enabled (it does by default when creating new VM) 
    82 ^ this means CD access won't hang 
     72 ^ this means CD access won't hang 
    8373 5. ensure 'Controller: SATA' has 'Use Host I/O Cache' disabled (it's disabled by default when creating new VM) 
    84 ^ this means HDD access will hang, below. 
     74 ^ this means HDD access will hang, below. 
    8575 6. start, Boot from CD/iso, you see grub "Boot Arch Linux (x86_64)", press Enter to boot from the iso 
    86 (do not boot HDD's OS, it will hang during boot sequence) 
     76 (do not boot HDD's OS, it will hang during boot sequence) 
    8777 7. you get to the root prompt, auto logged in. 
    8878 
    89 info: 
    90  
    91  
    92 This is the default, 256KiB of readahead: 
    93  
    94  
     79 info: 
     80 
     81 This is the default, 256KiB of readahead: 
    9582{{{ 
    9683# hdparm -a /dev/sda 
     
    156143 
    157144 
    158 No hang when the following: ---- 
    159  
    160  
    161  
    162 boot session 1: 
     145 No hang when the following: ---- 
     146 
     147 
     148 boot session 1: 
    163149 
    164150{{{ 
     
    166152}}} 
    167153 
    168 boot session 2: 
    169  
     154 boot session 2: 
    170155{{{ 
    171156dd if=/dev/sda of=/dev/null bs=512 skip=42216 count=2 
    172157}}} 
    173158 
    174 boot session 3: 
    175  
     159 boot session 3: 
    176160{{{ 
    177161dd if=/dev/sda of=/dev/null bs=512 skip=42215 count=1 
     
    180164 
    181165 
    182 Hang when the following: ---- 
    183  
    184  
    185  
    186 boot session 1: 
    187  
     166 Hang when the following: ---- 
     167 
     168 
     169 boot session 1: 
    188170{{{ 
    189171dd if=/dev/sda of=/dev/null bs=512 skip=42208 count=9 
    190172}}} 
    191173 
    192 boot session 2: 
    193  
     174 boot session 2: 
    194175{{{ 
    195176dd if=/dev/sda of=/dev/null bs=512 skip=42215 count=2 
    196177}}} 
    197178 
    198 boot session 3: 
    199  
     179 boot session 3: 
    200180{{{ 
    201181dd if=/dev/sda of=/dev/null bs=512 skip=42215 count=2 

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