17 Dec
2010
17 Dec
'10
9:52 p.m.
Wolfgang,
On 12/17/2010 02:21 PM, Wolfgang Denk wrote:
Dear Rob Herring,
In message1292425994-24331-1-git-send-email-robherring2@gmail.com you wrote:
From: Rob Herringrob.herring@calxeda.com
swab functions are heavily used by FDT code, so enable optimized assembly code for ARMv6 and later.
Signed-off-by: Rob Herringrob.herring@calxeda.com
arch/arm/include/asm/byteorder.h | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-)
Do you have any numbers if this changes gives any measurable improvement?
I have an instruction trace capture and see repeated calls to swab32 by the fdt code. It's an obvious low hanging fruit. The boot time for device tree vs. non-device tree is noticeably longer, but I don't have any formal measurements.
Rob