On Mon, Jan 29, 2007 at 02:07:11PM -0600, Eric Haszlakiewicz wrote:
> On Mon, Jan 29, 2007 at 02:48:26PM +0000, Steven M. Bellovin wrote:
> > I believe you were on the right track.  I think I understand the
> > problem now.
> > 
> > I had changed my dhclient.conf file to include
> > 
> > 
> > 	interface "wm0" {
> > 	       media "media autoselect";
> > 	}
> > 
> > That meant that any time I was using wireless or EVDO, dhclient was
> > still trying to acquire a wired lease.  This in turn meant constant
> > ifconfigs to change the media type, and neither dhclient nor the driver
> 
> 	If that's the cause of the jerky behaviour, then it's not limited
> to wm network cards.  I've seen similar stuff when fiddling with vr
> network interfaces (VIA VT6105 (Rhine III) 10/100 Ethernet) especially
> things like running tcpdump.
> 	I haven't looked into it, but my guess is there's probably a call to
> delay() with interrupts blocked somewhere in the driver.  In contrast,
> the aue interface on the same machine was fine.

I've reopened PR 29126 which is exactly about this issue (not sure about
wm, though - I don't see how might changing media cause it, but maybe
I haven't looked closely enough.)

Please append your observations to this PR.