17 Jan
2014
17 Jan
'14
2:06 p.m.
On Tue, Jan 14, 2014 at 08:02:26AM +0100, Łukasz Majewski wrote:
Disable L2 caches for Trats and Trats2 devices.
It turns out that for data downloading with thordown command L2 cache disablement brings a significant speed improvement.
rootfs - 400 MiB:
- L2 cache enabled: 2.69 MiB/s
- L2 cache disabled: 5.56 MiB/s
Such improvement is possible due to reduction of the need to invalidate redundant data, which resides in L2 cache.
Since the sent USB request size at once is 512B (L1 - 32 KiB in total) - one can be quite confident that it is already available in L1 and L2 can be disabled.
Change-Id: I911ea18075526f7e8295c30dfcf7a658ebc4e53b Signed-off-by: Lukasz Majewski l.majewski@samsung.com Acked-by: Minkyu Kang mk7.kang@samsung.com
Applied to u-boot/master, thanks!
--
Tom