Really Slow Boot

ikogan · 17. September 2015

I have my system installed on a 32gb SanDisk Ultra Fit USB 3.0 USB stick connected to (unfortunately) a USB 2.0 controller on a SuperMicro X7QC3 board. My system takes an unreasonably long time to boot. After it's all done POSTing and finding the boot drive, it'll sit at a black screen for minutes before showing the Grub menu, ticking down, and switching to a different black screen, where it will sit for another few minutes before showing the "Loading Kernel...". This then takes a minute or two and finally "Loading initial ram disk..." (or whatever) for minutes as well. Finally, once that's done, the system boots up quickly and functions great. I haven't counted but I would not be surprised if it takes upwards of 10 minutes to boot (but it's probably more like 5).

Does anyone know why this takes so long? I'm not loading the system into memory or anything after bootup:

Code

root@ezra:~# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=6193554,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=4956632k,mode=755)
/dev/disk/by-uuid/d926f14b-4de2-4d74-9ee8-460432c583b3 on / type ext4 (rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
Data on /data type zfs (rw,noatime,xattr,posixacl)
Data/Backups on /data/Backups type zfs (rw,relatime,xattr,posixacl)
Data/Homes on /data/Homes type zfs (rw,nodev,relatime,xattr,posixacl)
Data/Quarantine on /data/Quarantine type zfs (rw,noatime,xattr,posixacl)

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subzero79 · 17. September 2015

I would say is USB 1.1 speed, anything in bios that might be downgrading the speed of the USB controller ?

ikogan · 17. September 2015

According to `lsusb`:

Code

Bus 001 Device 004: ID 0781:5583 SanDisk Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x0781 SanDisk Corp.
  idProduct          0x5583
  bcdDevice            1.00
  iManufacturer           1 SanDisk
  iProduct                2 Ultra Fit
  iSerial                 3 4C530001020208115280
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              224mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk-Only
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Device Status:     0x0000
  (Bus Powered)

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However, you might be right that the BIOS runs the USB device at 1.0 and it only flips it to 2.0 once the kernel boots. That might make sense.

subzero79 · 17. September 2015

I think that's not possible if the usb 2 controller is disabled at bios I doubt it would make it to 2.0 by kernel

check the bios, also is this a new install and how much usage does that stick has?

ikogan · 17. September 2015

According to this presentation: http://www.usb.org/developers/…res0602/john_macinnis.pdf, most older BIOSes that support USB 2.0 will configure them for USB 1.0 until the OS reconfigures them. I'll check what my BIOS is set to but Linux claims, in the above output, that it's configured it for USB 2.0.

ikogan · 21. September 2015

It looks like we were both right. My BIOS settings had the USB 2.0 controller "enabled" but set to "Full Speed" rather than "Hi Speed" (what stupid names). Setting it to "Hi Speed" resolved my slow boot issue.

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