lkml.org 
[lkml]   [2006]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Network drivers that don't suspend on interface down
On Wed, Dec 20, 2006 at 02:49:06PM -0800, Stephen Hemminger wrote:

> When device is down, it should:
> a) use as few resources as possible:
> - not grab memory for buffers
> - not assign IRQ unless it could get one
> - turn off all power consumption possible
> b) allow setting parameters like speed/duplex/autonegotiation,
> ring buffers, ... with ethtool, and remember the state

Veering off at something of a tangent - how much of this should be true
for wireless devices? Softmac seems to be unhappy about setting the
essid unless the card is up, which breaks various assumptions...

Beyond that, I think your descriptions of up and down states make sense
for userspace. As Arjan suggests, there's then the intermediate state of
"disable as much as possible while still providing scanning and link
detection".

> 2) Network device infrastructure should make it easier for devices:
> bring interface down on suspend and bring it up after resume
> (if it was running when suspended). This would allow many devices to
> have no suspend/resume hook; except those that have some better power
> control over hardware.

I'd have some concerns over how that would interact with the rest of the
PM infrastructure, but it certainly sounds good in principle.

--
Matthew Garrett | mjg59@srcf.ucam.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-12-21 02:15    [from the cache]
©2003-2011 Jasper Spaans