From: "Richard W.M. Jones" <rjones@redhat.com>
To: "Marc Marí" <markmb@redhat.com>
Cc: "Marc Marí" <marc.mari.barcelo@gmail.com>,
"Gabriel L. Somlo" <somlo@cmu.edu>,
qemu-devel@nongnu.org, "Kevin O'Connor" <kevin@koconnor.net>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>, Laszlo <lersek@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v4] Add optionrom compatible with fw_cfg DMA version
Date: Mon, 21 Mar 2016 11:14:16 +0000 [thread overview]
Message-ID: <20160321111416.GC19398@redhat.com> (raw)
In-Reply-To: <1454065944-15887-1-git-send-email-markmb@redhat.com>
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!
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW
prev parent reply other threads:[~2016-03-21 11:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 11:12 [Qemu-devel] [PATCH v4] Add optionrom compatible with fw_cfg DMA version Marc Marí
2016-01-29 15:25 ` Stefan Hajnoczi
2016-02-02 11:06 ` Gerd Hoffmann
2016-02-02 12:04 ` Gerd Hoffmann
2016-02-02 13:07 ` Marc Marí
2016-02-02 14:23 ` Gerd Hoffmann
2016-02-02 15:04 ` Laszlo Ersek
2016-02-03 8:44 ` Gerd Hoffmann
2016-02-03 11:48 ` Laszlo Ersek
2016-02-03 12:57 ` Gerd Hoffmann
2016-02-02 12:58 ` Marc Marí
2016-02-03 9:47 ` Stefan Hajnoczi
2016-02-22 11:56 ` Vladimir Sementsov-Ogievskiy
2016-02-23 9:51 ` Stefan Hajnoczi
2016-03-21 11:14 ` Richard W.M. Jones [this message]
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