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

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Message-ID: <alpine.LFD.1.10.0804170211220.8464@nev.ubzr>
Date:	Thu, 17 Apr 2008 02:23:08 +0400 (MSD)
From:	"Lev A. Melnikovsky" <melnikovsky@...l.ru>
To:	Oliver Neukum <oliver@...kum.org>
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

Oliver,

ON> EHCI should not scan an empty async. However this manufacturer
ON> has shown a liberal attitude about conforming with specifications.
ON> If the root hub is suspended, it can't do DMA. So it might help.
Yes, it does, thank you. No DMA when suspended. Auto-suspend is executed 
if external hub is the only attached device. Can this be used to block 
spurious schedule traversal?

Thnks
-L
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