Why is SeaBIOS used with -kernel?

Commit Message

Richard W.M. Jones April 1, 2016, 8:25 p.m. UTC

On Fri, Apr 01, 2016 at 03:44:14PM -0400, Kevin O'Connor wrote:
[...]

I ran all the tests again, but this time I ran the test program 3
times (so 30 passes for each setting).  As you can see from the
results below the test is not very stable, so that could easily have
accounted for the variation I saw when I only ran the test program
once for each setting.

The difference in .config is just:


Rich.

----------------------------------------------------------------------

CONFIG_BOOTORDER=y

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1098.0ms ±0.8ms

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1095.9ms ±0.4ms

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1087.5ms ±3.8ms



CONFIG_BOOTORDER=n

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1103.4ms ±2.6ms

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1097.2ms ±4.8ms

 passes 10
 append 
backend libvirt
     hv /home/rjones/d/qemu/x86_64-softmmu/qemu-system-x86_64
memsize 500
    smp 1

Result: 1098.0ms ±8.3ms

Patch

--- seabios-bootorder=n.config	2016-04-01 21:19:53.599230008 +0100
+++ seabios-bootorder=y.config	2016-04-01 21:19:31.090441232 +0100
@@ -14,7 +14,7 @@ 
 CONFIG_THREADS=y
 # CONFIG_RELOCATE_INIT is not set
 # CONFIG_BOOTMENU is not set
-# CONFIG_BOOTORDER is not set
+CONFIG_BOOTORDER=y
 CONFIG_ENTRY_EXTRASTACK=y
 CONFIG_MALLOC_UPPERMEMORY=y
 CONFIG_ROM_SIZE=0