Re: Gnome Pilot Causing USB Drive problems (version 2.0.10)

[Jason 'vanRijn' Kasper <vR movingparts net>]

On Wed, 2004-09-08 at 09:15, Nigel Metheringham wrote:
> On Wed, 2004-09-08 at 06:46 -0400, David A. Desrosiers wrote:
> > > Won't help in this case.  Its not when gnome-pilotd is talking to a 
> > > USB palm device, but when gnome-pilotd polling to see if a palm 
> > > device is attached.  At that point (unless you have just hit hotsync 
> > > on the palm) the visor module isn't loaded.
> > 
> >  	That depends on your system configuration. I've never yet run 
> > the visor driver on a sytem where it wasn't already loaded. hotplug 
> > causes FAR too many problems with Palm devices, and that is exactly 
> > why we strongly recommend disabling it if you use a USB-connected 
> > Palm.
> 
> OK, I have now managed to reproduce this problem with pretty much a bare
> minimum around it.
> 
> If a program uses poll() and opens/stat/reads /proc/bus/usb/devices then
> USB transfers appear to stutter/fail to USB Mass Storage or other bulk
> USB users (I have a USB mouse which is unaffected).  Use of poll() or
> read or stat of the device file alone is not effective - you need all
> three components.
> 
> I did not have the visor module loaded during these tests, so thats not
> involved.  The poll was looking at input from a FH opened on /dev/null
> (so it wasn't doing much).  I did see freezes on the open/read
> of /proc/bus/usb/devices while this was happening - 4 or 5 second hangs.
> 
> If anyone wants my bit of perl which I am using as a test load generator
> to show this problem then drop me a line - its only 30 or so lines.
> 
> I suspect that if gpilod was modded to drop the fstat() of
> the /proc/bus/usb/devices file after opening it then the problem would
> go away - I may try doing this later.
> 


yes, please post your script!  =:)

thanks!!

-- 

,-----------------------------------------------------------------//
| Jason 'vanRijn' Kasper ::  Numbers 6:22-26 
 `
 | All brontosauruses are thin at one end, much MUCH thicker 
 | in the middle, and then thin again at the far end.  That is 
 | the theory that I have and which is mine, and what it is too.  
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