From: David Brownell <david-b@pacbell.net>
To: "Lev A. Melnikovsky" <melnikovsky@mail.ru>
Cc: Alessandro Suardi <alessandro.suardi@gmail.com>,
Rene Herman <rene.herman@keyaccess.nl>,
linux-kernel@vger.kernel.org
Subject: Re: ehci-hcd affects hda speed
Date: Mon, 17 Mar 2008 13:06:52 -0800 [thread overview]
Message-ID: <200803171406.53241.david-b@pacbell.net> (raw)
In-Reply-To: <alpine.LFD.1.00.0803160054360.23451@nev.ubzr>
On Saturday 15 March 2008, Lev A. Melnikovsky wrote:
> Particularly, what does "MAC turn around
> time" stand for with respect to EHCI? I would appreciate some reference,
> thanks.
Blame VIA for that one. Notice how their descriptions of the
fields in that register don't even mention a MAC. :)
But the relevant bit is the "sleep time" and that's described
in the EHCI specification. It basically means how long it waits,
after noticing a "no work for me" async schedule ring, before
scanning that schedule again. It seems your system had that
set to just 1 usec, meaning it would hardly give anything else
a chance to get onto the PCI bus. That's probably why the EHCI
spec uses a value of 10 usec: basic fairness.
- Dave
next prev parent reply other threads:[~2008-03-17 21:07 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-04 22:27 Lev A. Melnikovsky
2008-03-05 16:19 ` Rene Herman
2008-03-05 20:03 ` Alessandro Suardi
2008-03-05 21:03 ` David Brownell
2008-03-06 16:25 ` Alessandro Suardi
2008-03-06 20:10 ` Lev A. Melnikovsky
2008-03-10 10:11 ` Lev A. Melnikovsky
2008-03-15 22:46 ` Lev A. Melnikovsky
2008-03-17 16:15 ` Alessandro Suardi
2008-03-17 21:06 ` David Brownell [this message]
[not found] ` <47DC596A.4010800@keyaccess.nl>
[not found] ` <200803171400.40045.david-b@pacbell.net>
2008-03-17 23:23 ` Rene Herman
2008-03-17 23:26 ` Rene Herman
2008-03-18 0:00 ` David Brownell
2008-03-18 0:24 ` Lev A. Melnikovsky
2008-03-18 1:27 ` Rene Herman
2008-03-18 1:45 ` David Brownell
2008-03-18 1:23 ` Rene Herman
2008-03-18 1:55 ` David Brownell
2008-03-18 3:13 ` Rene Herman
2008-03-19 23:47 ` Lev A. Melnikovsky
2008-03-20 0:31 ` Rene Herman
2008-03-20 5:08 ` Alessandro Suardi
2008-03-20 11:35 ` Rene Herman
2008-03-20 21:01 ` Alessandro Suardi
2008-04-15 19:56 ` Lev A. Melnikovsky
2008-04-15 20:02 ` Oliver Neukum
2008-04-15 20:41 ` Lev A. Melnikovsky
2008-04-16 5:38 ` Oliver Neukum
2008-04-16 22:23 ` Lev A. Melnikovsky
2008-04-17 8:20 ` Oliver Neukum
2008-04-15 20:24 ` Rene Herman
2008-04-15 20:32 ` Rene Herman
2008-04-15 23:17 ` David Brownell
2008-04-16 22:44 ` Lev A. Melnikovsky
2008-03-18 22:02 ` Alessandro Suardi
2008-03-18 22:09 ` Rene Herman
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