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

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Sep 02, 2010 at 09:00:42AM -0600, Alex Williamson wrote:
> 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

ACK the series.

Please remember to clone bugzilla into libvirt and ask them
to support the new option on zstream/0day, so that we do have
a working backup plan.

> ---
> 
> 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(-)