[SeaBIOS] QEMU fw_cfg DMA interface
stefanha at gmail.com
Thu Aug 6 12:40:24 CET 2015
On Thu, Aug 6, 2015 at 1:37 PM, Marc Marí <markmb at redhat.com> wrote:
> On Thu, 6 Aug 2015 13:27:16 +0100
> Stefan Hajnoczi <stefanha at gmail.com> wrote:
>> On Thu, Aug 6, 2015 at 12:00 PM, Marc Marí <markmb at redhat.com> wrote:
>> > When running a Linux guest on top of QEMU, using the -kernel
>> > options, this is the timing improvement for x86:
>> > QEMU commit 2be4f242b50a8 and SeaBIOS commit 908a58c1d5ff
>> > QEMU startup time: .078
>> > BIOS startup time: .060
>> > Kernel setup time: .578
>> > Total time: .716
>> > QEMU with this patch series and SeaBIOS with this patch series
>> > QEMU startup time: .080
>> > BIOS startup time: .039
>> > Kernel setup time: .002
>> > Total time: .121
>> Impressive results!
>> Is this a fully-featured QEMU build or did you disable things?
>> Is this the default SeaBIOS build or did you disable things?
> This is the default QEMU configuration I get for my system. It's not a
> fully-featured QEMU, but it has a lot of things enabled. SeaBIOS
> has a default configuration (with debugging disabled).
Since SeaBIOS is a default configuration, the remaining BIOS startup
time is amenable to more optimizations in the future.
More information about the SeaBIOS