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[Bug 247960] Re: Grub long sequential reads are extremely slow from USB2.0 HDD/FLASH drives

 

I can report that this bug is still present in 14.04 Server Edition.

I am running an HP Proliant MicroServer G1610.  The OS boots from a
Sandisk Cruzer.  It is a full installation, not a LiveUSB.

The delay between POST and GRUB is over 5 minutes.  Reinstalling Grub
does not resolve the issue.  Once Grub shows up, the rest of the boot
goes smoothly, and the USB drive works fine.

Replacing Grub2 with Extlinux (Syslinux) results in a normal boot time
that can be measured in seconds between POST and the bootloader.

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https://bugs.launchpad.net/bugs/247960

Title:
  Grub long sequential reads are extremely slow from USB2.0 HDD/FLASH
  drives

Status in GRand Unified Bootloader:
  Confirmed
Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  Grub long sequential reads are extremely slow from USB2.0 HDD/FLASH drives.
  Reading vmlinuz(4.6MB) + initrd(18MB) takes several minutes (~0.5Mb/s)

  Issues affects all grub versions until current in Natty (1.99~rc1-13ubuntu1).
  But might be related to bad BIOS implementations.

  Affected chipsets:
  Intel 915 (todo)
  Intel 965 (82801G)
  Nvidia MCP79

  Not-Affected chipsets:
  Intel 965 (82801H)

  Original description:
  I'm using Hardy. Nothing happens for 50 seconds during bootup. There is only a blinking cursor on the screen after the grub menu. After the 50 seconds the splash screen appears. This problem only occurs on cold start, it doesn't happen when I just reboot. I have an HP nw8440 laptop. I'm attaching my dmesg and lspci -vv output.

  Old Update: I've found out that initrd is read really slowly and this
  is causing the long delay during boot. Please read comment #27:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/247960/comments/27

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