From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Fri, 10 Aug 2012 00:32:03 +0200 Subject: [U-Boot] [PATCH v3 3/8] ehci-hcd: Boost transfer speed In-Reply-To: <1023824512.2236771.1344549080659.JavaMail.root@advansee.com> References: <1023824512.2236771.1344549080659.JavaMail.root@advansee.com> Message-ID: <201208100032.03595.marex@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Beno?t Th?baudeau, > This patch takes advantage of the hardware EHCI qTD queuing mechanism to > avoid software and transfer splitting overhead so as to make transfers as > fast as possible. > > The only drawback is a call to memalign. However, this is fast compared to > the transfer timings, and the heap size to allocate is small, e.g. 128 kiB > in the worst case for a transfer length of 65535 packets of 512 bytes. > > Tested on i.MX25, i.MX35 and i.MX51. In my test conditions, the speed gain > was very significant (several times faster), which is really appreciable > when accessing large files. > > Signed-off-by: Beno?t Th?baudeau > Cc: Marek Vasut > Cc: Ilya Yanok > Cc: Stefan Herbrechtsmeier [...] Seems fine :) Best regards, Marek Vasut