From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v3 3/8] ehci-hcd: Boost transfer speed
Date: Fri, 10 Aug 2012 00:32:03 +0200 [thread overview]
Message-ID: <201208100032.03595.marex@denx.de> (raw)
In-Reply-To: <1023824512.2236771.1344549080659.JavaMail.root@advansee.com>
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
next prev parent reply other threads:[~2012-08-09 22:32 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-19 20:17 [U-Boot] [PATCH 2/5] ehci-hcd: Boost transfer speed Benoît Thébaudeau
2012-07-20 11:26 ` [U-Boot] [PATCH v2 " Benoît Thébaudeau
2012-07-20 11:37 ` Stefan Herbrechtsmeier
2012-07-20 13:17 ` Benoît Thébaudeau
2012-07-20 13:44 ` Marek Vasut
2012-07-20 13:56 ` Benoît Thébaudeau
2012-07-20 14:51 ` Stefan Herbrechtsmeier
2012-07-20 15:03 ` Benoît Thébaudeau
2012-07-20 15:15 ` Stefan Herbrechtsmeier
2012-07-20 15:35 ` Benoît Thébaudeau
2012-07-23 13:35 ` Stefan Herbrechtsmeier
2012-07-23 17:15 ` Benoît Thébaudeau
2012-07-24 13:02 ` Stefan Herbrechtsmeier
2012-07-29 0:48 ` Benoît Thébaudeau
2012-07-30 22:38 ` Marek Vasut
2012-07-31 1:06 ` Benoît Thébaudeau
2012-07-31 19:52 ` Stefan Herbrechtsmeier
2012-08-01 2:41 ` Marek Vasut
2012-08-03 23:02 ` Benoît Thébaudeau
2012-08-04 7:45 ` Marek Vasut
2012-08-08 23:14 ` Benoît Thébaudeau
2012-08-08 23:14 ` Marek Vasut
2012-07-31 20:01 ` Stefan Herbrechtsmeier
2012-07-27 14:07 ` Marek Vasut
2012-07-27 14:16 ` Benoît Thébaudeau
2012-07-27 14:30 ` Marek Vasut
2012-08-09 21:51 ` [U-Boot] [PATCH v3 3/8] " Benoît Thébaudeau
2012-08-09 22:32 ` Marek Vasut [this message]
2012-07-27 12:54 ` [U-Boot] [PATCH 2/5] " Marek Vasut
2012-07-27 13:59 ` Benoît Thébaudeau
2012-07-27 14:01 ` Marek Vasut
2012-07-27 14:13 ` Benoît Thébaudeau
2012-07-27 14:31 ` Marek Vasut
2012-07-29 0:58 ` Benoît Thébaudeau
2012-07-29 1:40 ` Marek Vasut
2012-07-29 14:14 ` Benoît Thébaudeau
2012-07-29 18:08 ` Marek Vasut
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