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Date: Wed, 13 Jul 2016 13:27:41 +0100
From: "Richard W.M. Jones" <rjones@redhat.com>
Message-ID: <20160713122741.GW16797@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v10] Add optionrom compatible with fw_cfg
 DMA version
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org, marc.mari.barcelo@gmail.com, kraxel@redhat.com, Marc =?iso-8859-1?Q?Mar=ED?= <markmb@redhat.com>

Thanks for reposting this Paolo.

I tested it by applying it on top of qemu.  In libguestfs sources we
have a benchmark program called utils/boot-benchmark/boot-benchmark.

Using the qemu package from Fedora (qemu-2.6.0-3.fc24.x86_64):

  $ killall -STOP firefox
  $ ./boot-benchmark
  Result: 2341.7ms =B110.9ms

With the unpatched upstream qemu:

  $ LIBGUESTFS_HV=3D~/d/qemu/x86_64-softmmu/qemu-system-x86_64 ./boot-ben=
chmark=20
  Result: 2282.3ms =B11.7ms

With the patched upstream qemu:

  $ LIBGUESTFS_HV=3D~/d/qemu/x86_64-softmmu/qemu-system-x86_64 ./boot-ben=
chmark=20
  Result: 1452.4ms =B10.9ms

So the patch works and makes a significant difference.

Note I still had to do by hand:

  $ cp pc-bios/optionrom/linuxboot_dma.bin pc-bios/

Rich.

--=20
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rj=
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