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Re: [Qemu-devel] [PATCH v4] Add optionrom compatible with fw_cfg DMA ver

From: Richard W.M. Jones
Subject: Re: [Qemu-devel] [PATCH v4] Add optionrom compatible with fw_cfg DMA version
Date: Mon, 21 Mar 2016 11:14:16 +0000
User-agent: Mutt/1.5.20 (2009-12-10)

My notes on this patch:

* It applies and compiles fine with current qemu on Linux/x86_64 host.
  However after building I had to do:

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

  I wasn't sure if that was supposed to be done automatically.

* It reduces libguestfs appliance boot time by about ½ second
  (2.00 s -> 1.53 s), so that's excellent.

* Overhead of BIOS-to-kernel drops from nearly 50% to under 20% of the
  total libguestfs appliance boot time.  SeaBIOS is still using 0.27
  seconds, of which at least 0.12 seconds is PCI bus scanning.

Anyway, all in all, a good change!


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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