linux-kernel - Re: [PATCH] usbnet: improve/fix status interrupt endpoint interval

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Message-ID: <7493213.1jnuhRJXML@linux-5eaq.site>
Date:	Wed, 05 Jun 2013 08:06:05 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Andreas Mohr <andi@...as.de>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	OndrejZary <linux@...nbow-software.org>,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH] usbnet: improve/fix status interrupt endpoint interval

On Tuesday 04 June 2013 20:28:30 Andreas Mohr wrote:
> 
> From 307685fe8e6dfc8181e30167b9c31479332cb22f Mon Sep 17 00:00:00 2001
> From: Andreas Mohr <andim2@...rs.sourceforge.net>
> Date: Sun, 2 Jun 2013 20:37:05 +0200
> Subject: [PATCH] usbnet: improve/fix status interrupt endpoint interval
>  tweaking.
> 
> - failed to take super-speed into account
> - <= full-speed seems to have wrong value (specified as frames [ms],
>   thus 3 is not suitable to achieve 8ms)
>   Value 8 now managed to reduce powertop wakeups from ~ 540 to ~ 155
> - add detailed docs and question marks about current practice
> ---
>  drivers/net/usb/usbnet.c |   17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> 
> Found this with MCS7830 on a full-speed USB 1.1 port (Inspiron 8000).
> Good to have a rusty notebook with noisy PSU coils, else it would
> have taken a lot longer to nail it ;)
> Tested on -rc4, checkpath.pl:d.
> 
> Signed-off-by: Andreas Mohr <andim2@...rs.sourceforge.net>
Acked-by: Oliver Neukum <oliver@...kum.org>
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