Re: [LAU] USB on ThinkPad T520

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To: Robin Gareus <robin@...>
Cc: A list for linux audio users <linux-audio-user@...>
Date: Sunday, May 13, 2012 - 8:40 pm

On Sun, May 13, 2012 at 4:06 PM, Robin Gareus wrote:

> Any hints on how to address this issue, then? If I understand correctly,

The primary problem with EHCI is only bandwidth allocation; it's
inefficient. I'm unaware of any timing problems. That's not to say
they don't exist, I just haven't run into them myself.

Poor bandwidth efficiency aside, I usually see ~ the same latency and
timing behavior on UHCi and EHCI with a TT.

> Would forward porting your schedulers be an option? Has anything of this

I'm unlikely to do this unless I need it myself, sorry :-(. Not
enough time, too much to do. And the kernel devs are absolutely right
that replacing a working but inefficient driver with a brand new one
that is faster but will require long-term testing is not something to
be done lightly.

> Maybe you can do play some tricks on the EHCI controller/scheduler: add

You'll still be going through the translator in the root hub.

Monty
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Messages in current thread:
[LAU] USB on ThinkPad T520, plutek, (Sat May 12, 2:52 pm)
Re: [LAU] USB on ThinkPad T520, Clemens Ladisch, (Sat May 12, 6:31 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Sun May 13, 1:12 am)
Re: [LAU] USB on ThinkPad T520, Clemens Ladisch, (Sun May 13, 9:07 am)
Re: [LAU] USB on ThinkPad T520, Karsten Wiese, (Sat May 12, 9:18 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Sun May 13, 1:13 am)
Re: [LAU] USB on ThinkPad T520, Robin Gareus, (Sun May 13, 6:57 am)
Re: [LAU] USB on ThinkPad T520, plutek, (Sun May 13, 5:45 pm)
Re: [LAU] USB on ThinkPad T520, Robin Gareus, (Sun May 13, 6:15 pm)
Re: [LAU] USB on ThinkPad T520, Monty Montgomery, (Sun May 13, 7:28 pm)
Re: [LAU] USB on ThinkPad T520, Robin Gareus, (Sun May 13, 8:06 pm)
Re: [LAU] USB on ThinkPad T520, Monty Montgomery, (Sun May 13, 8:40 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Mon May 14, 4:31 pm)
Re: [LAU] USB on ThinkPad T520, david, (Mon May 14, 6:23 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Mon May 14, 7:20 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Mon May 14, 7:22 pm)
Re: [LAU] USB on ThinkPad T520, david, (Wed May 16, 8:25 am)
Re: [LAU] USB on ThinkPad T520, hermann, (Wed May 16, 8:33 am)
Re: [LAU] USB on ThinkPad T520, david, (Thu May 17, 5:45 pm)
Re: [LAU] USB on ThinkPad T520, Tim Westbrook, (Fri May 18, 6:57 am)
Re: [LAU] USB on ThinkPad T520, Clemens Ladisch, (Sun May 13, 8:29 pm)
Re: [LAU] USB on ThinkPad T520, plutek, (Sun May 13, 6:32 pm)
Re: [LAU] USB on ThinkPad T520, Monty Montgomery, (Sun May 13, 2:56 am)