[Qemu-devel] [PATCH v2 0/4] virtio-net: More configurability and bh handling for tx

[Alex Williamson <alex.williamson@redhat.com>]

Incorporated feedback.  txburst= and txtimer= are now "x-" prefixed
developer options.  I added a tx= option, because I do want there to
be a supported way to switch between TX strategies.  This also drops
the magic value of txtimer= 1 or 0 (setting default timeout or switching
modes).  I also dropped the trickiness around only enabling the bottom
half for the iothread since Anthony indicates we don't care about
performance for the non-iothread case.

New performance data against both qemu.git and qemu-kvm.git:

https://spreadsheets.google.com/pub?key=0AoEm50Bac2U7dGdlREhrWUpPVEdMcTJaX0RjSEgtc3c&hl=en&single=true&gid=0&output=html

This shows the base performance versus patched with new default for
various packet sizes and netperf test loads.  The guest is a 2-way
SMP, connected directly to the host via a tap (no bridge).  Thanks,

Alex

---

Alex Williamson (4):
      virtio-net: Introduce a new bottom half packet TX
      virtio-net: Rename tx_timer_active to tx_waiting
      virtio-net: Limit number of packets sent per TX flush
      virtio-net: Make tx_timer timeout configurable


 hw/s390-virtio-bus.c |    8 +++
 hw/s390-virtio-bus.h |    1 
 hw/syborg_virtio.c   |    8 +++
 hw/virtio-net.c      |  129 +++++++++++++++++++++++++++++++++++++++++---------
 hw/virtio-net.h      |   14 +++++
 hw/virtio-pci.c      |    8 +++
 hw/virtio.h          |    4 +-
 7 files changed, 144 insertions(+), 28 deletions(-)