[Qemu-devel] e1000e migration

[Dr. David Alan Gilbert]

Hi Dmitry,
  Have you seen any problems with e1000e migration under windows?
I've got a repeatable case where after migration with e1000e windows
hangs/almost hangs.
  I'm seeing the e1000e generate interrupts at a very very high
rate (maybe ~1000 second ish?) after migration.

  Some versions of qemu do it and some dont, but my attempts
at bisection lead me to code that should be irrelevant.

Prior to migration I see:

address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x100000 (ICR: 
0x80100082, IMS: 0x1f00004)
address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x0 (ICR: 0x80000082, 
IMS: 0x1a00004)
address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x0 (ICR: 0x80000082, 
IMS: 0x1f00004)
address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x0 (ICR: 0x80000082, 
IMS: 0x1a00004)
address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x0 (ICR: 0x80000082, 
IMS: 0x1f00004)

which I think the ICR means:
      31 - int asserted
      20 - RxQ0 - receive queue 0 interrupt
      7  - RXT0 - receiver timer interrupt
      1  - TXQE - Transmit Queue empty

after migration it varies more, I'm seeing mostly:
address@hidden:e1000e_irq_pending_interrupts ICR PENDING: 0x1000000 (ICR: 
0x815000c2, IMS: 0x1a00004)
      31 - int asserted
      24 - 'Other'
      22 - TxQ0 interrupt
      20 - RxQ0 interrupt
      07 - RXT0 Receiver timer interrupt
      06 - RX0 - Receiver overrun
      01 - TXQE - Transmit queue empty

For reference this is https://bugzilla.redhat.com/show_bug.cgi?id=1447935

Dave
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK