[RHEL5.3 GA] A message 'serial8250: too much work for irq4' is out on SMP full-virtualized domU with serial console.

Solution Verified - Updated -

Issue

  • Note that this problem was originated in RHEL5.1 Beta (IT#130134) and seemed almost fixed on RHEL5.3 GA,
  • The problem that remains to be solved is that weired message is shown on serial console.

  • Where creating a SMP full-virtualized domU by Virtual Machine Mnager(VMM) or "xm create"

  • and access to its serial console via "View"-"Serial Console" or "xm console",

  • and if a certain amount of data is output at once to the serial console, a message "serial8250: too much work for irq4" is displayed.

  • Additional info:

    • This issue happens on i386 SMP full-virtualized domU(with "acpi=off" kernel parameter) too.
    • This issue does not happen on UP full-virtualized domU(both x86_64 and i386), i.e. if you specify "vcpus = 1" in config file.

Environment

  • Red Hat Enterprise Linux 5.3
    • xen-3.0.3-80.el5
    • kernel-2.6.18-128.el5
    • kernel-xen-2.6.18-128.el5

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