[U-Boot] [PATCH v3 3/8] ehci-hcd: Boost transfer speed

Marek Vasut
2012-08-09T22:32:03Z

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 <benoit.thebaudeau@advansee.com>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Ilya Yanok <ilya.yanok@cogentembedded.com>
> Cc: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
[...]

Seems fine :)

Best regards,
Marek Vasut