linux-kernel - Re: ehci-hcd affects hda speed

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Message-Id: <200804160738.13437.oliver@neukum.org>
Date:	Wed, 16 Apr 2008 07:38:12 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	"Lev A. Melnikovsky" <melnikovsky@...l.ru>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Alessandro Suardi <alessandro.suardi@...il.com>,
	David Brownell <david-b@...bell.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: ehci-hcd affects hda speed

Am Dienstag, 15. April 2008 22:41:19 schrieb Lev A. Melnikovsky:
> 
>   On Wed, 16 Apr 2008 at 12:02am, Oliver Neukum wrote:
> 
> ON> Am Dienstag, 15. April 2008 21:56:24 schrieb Lev A. Melnikovsky:
> ON> > The oddest peculiarity for me is the hysteretic difference between #1 and 
> ON> > #3 states. I mean experimental data (hda throughput) depends not on the 
> ON> > state (hardware/loaded modules), but on the path we followed.
> ON> 
> ON> Did you compile with CONFIG_USB_SUSPEND?
> 
> # CONFIG_USB_SUSPEND is not set
> 
> Does this explain something?

EHCI should not scan an empty async. However this manufacturer
has shown a liberal attitude about conforming with specifications.
If the root hub is suspended, it can't do DMA. So it might help.

	Regards
		Oliver
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