[Gta04-owner] Host AP mode

NeilBrown neilb at suse.de
Thu May 31 08:31:52 CEST 2012


On Thu, 31 May 2012 08:14:35 +0200 Andreas Kemnade <andreas at kemnade.info>
wrote:

> Hi,
> 
> On Thu, 31 May 2012 11:00:44 +1000
> NeilBrown <neilb at suse.de> wrote:
> 
> >
> > I can confirm that I see the same slowdown.
> > 
> > With 2.6.32, it reports a Bit Rate of 24Mb/s and a link quality of 39/100,
> > and I get about 1.1 to 1.4 MB/s throughput.
> > 
> > With 3.4, it reports 5.5Mb/sec (and won't let me change it) with a link
> > quality of 63/70 (!) and I get about 150 kB/s throughput.
> > 
> > So it does look like something is broken in 3.4.
> > The difference between the hw kernel and 3.4 is 
> > 
> >  34 files changed, 5633 insertions(+), 3319 deletions(-)
> > 
> > which is quite a lot:
> > 
> > [,,,]
> > 
> > You would probably be better off posting a question to some relevant mailing list.
> > Daniel Drake <dsd at laptop.org> seems to be the main contributor, so 'cc' him.
> > Dan Williams <dcbw at redhat.com> is listed as the maintainer.
> > libertas-dev at lists.infradead.org and linux-wireless at vger.kernel.org 
> > seem to be the relevant email lists.
> > 
> I asked google a bit:
> 
> http://www.spinics.net/lists/linux-wireless/msg52355.html
> 
> To cite a bit:
> > What SDIO host controller?  Does the host controller support interrupts
> > and 4-bit mode?  We've always been able to get good performance out of
> > laptop host controllers (Ricoh mostly) and the largest source of
> > performance issues has always been quirky hardware or non-optimized SDHC
> > drivers.  Are there any errata for your SDHC that you're aware of?

Interesting. However that email thread is nearly 2 years old, and the
mmc driver in 3.4 does appear to support 4-bit mode and interrupts.
("grep mmc1 /proc/interrupts" shows lots of interrupts anyway).

So I suspect that the issues today are very different to the issues then.

NeilBrown
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