[bug #30778] Enabling serial terminal on a machine without serial hardware makes console terminal unusably slow

[Jordan Uggla]

URL:
  <http://savannah.gnu.org/bugs/?30778>

                 Summary: Enabling serial terminal on a machine without
serial hardware makes console terminal unusably slow
                 Project: GNU GRUB
            Submitted by: jordanu
            Submitted on: Sun 15 Aug 2010 08:27:48 AM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Bazaar - trunk
         Reproducibility: Every Time
         Planned Release: None

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Details:

When booting grub from a machine without serial hardware, enabling serial
terminal makes console terminal print so slowly that it takes 5 minutes to
display the initial menu.

This is reproducible in qemu following these steps:

mkdir -p overlay/boot/grub/

echo "serial; terminal_output --append serial" > overlay/boot/grub/grub.cfg

grub-mkrescue -o serial_timeout.img overlay

qemu serial_timeout.img -serial none




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