From mboxrd@z Thu Jan 1 00:00:00 1970 From: Minkyu Kang Date: Tue, 14 Jan 2014 18:57:41 +0900 Subject: [U-Boot] [PATCH 3/3] config: Update envs for trats and trats2 - Disable L2 cache In-Reply-To: <1389682946-29694-4-git-send-email-l.majewski@samsung.com> References: <1389682946-29694-1-git-send-email-l.majewski@samsung.com> <1389682946-29694-4-git-send-email-l.majewski@samsung.com> Message-ID: <52D50A15.8020102@samsung.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 14/01/14 16:02, Lukasz 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 > --- > include/configs/trats.h | 1 + > include/configs/trats2.h | 1 + > 2 files changed, 2 insertions(+) > Acked-by: Minkyu Kang Thanks, Minkyu Kang.