Hi,
I've been following armv7 recent changes and these days I was able to
compare kernel compile times on 2 of the supported boards.
The first is an omap BeagleBone Black with a NFS-mounted /usr/src. It's
pretty stable and I had no issues so far with what is supported.
The second is a sunxi CubieBoard 2 with the Allwinner A20 SoC. This one
has a 1.8" hdd instead.
BeagleBone Black:
(...)
ld -T ldscript --warn-common -nopie -S -o bsd ${SYSTEM_HEAD} vers.o ${OBJS}
text data bss dec hex
3684900 104816 470508 4260224 410180
59m00.17s real 51m31.67s user 3m43.93s system
CubieBoard 2:
(...)
ld -T ldscript --warn-common -nopie -S -o bsd ${SYSTEM_HEAD} vers.o ${OBJS}
text data bss dec hex
3684128 104816 470080 4259024 40fcd0
269m38.01s real 252m33.07s user 12m29.56s system
The sizes are slightly different because one source tree is maybe a
dozen commits ahead of the other, so no significant changes.
The cb2 host kernel has a small workaround published by Patrick Wildt on
bugs@, to only flush a TLB for a specified VA, not the entire TLB. It
prevents a flood of pmap_fault_fixup messages on console. I know there
are things to be done here, although I don't know if the slow cb2 times
compared to bbb are related to this.
http://marc.info/?l=openbsd-bugs&m=145840460330909&w=2
I was expecting cb2 to be faster than bbb.
Related to sxie(4) on cb2, it's common to lose the ssh session with
packet_write_poll when there is no activity. I was able to compile the
full kernel without problem, though.
packet_write_poll: Connection to 192.168.1.220 port 22: Host is down
It seems the imx are much more popular on arm@ because they are faster,
but these boards are tough to find in Brazil.
Just a little feedback.
--
db
