[PATCH] usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP
From: Mark Salter <hidden>
Date: 2011-08-31 13:43:33
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linux-omap
On Wed, 2011-08-31 at 09:49 +0100, Will Deacon wrote:
On Wed, Aug 31, 2011 at 01:23:47AM +0100, Chen Peter-B29397 wrote:quoted
One question: why this write buffer issue did not happen at UP ARM V7 platform, whose dma buffer also uncache, but bufferable?Which CPU was on this platform?
Using a 3.1.0-rc4+ kernel on a Pandaboard, and running 'hdparm -t' on a usb disk drive, I see ~5.8MB/s read speed. Same kernel, but passing nosmp on the commandline, I see 20.3MB/s. Can someone explain why nosmp would make such a difference? --Mark