On 05/13/2016 02:33 PM, François Patte wrote:
Le 13/05/2016 18:45, Rick Stevens a écrit :
On 05/13/2016 02:12 AM, François Patte wrote:
Bonjour,
The issue now is about wifi connections and usb (!!)
If I plug an external usb harddrive, the wifi connection becomes awfull:
I tested the rate of transfert from one computer to my updated laptop,
using this:
dd if=/dev/zero of=test bs=100M count=1; scp test me@laptop:/dev/null;
Without any usb hdd plugged, the rate begins at 4.7MB/s and falls down
to 2.4MB/s which is acceptable I think.
With an usb hdd plugged (I tested with several devices), the rate
quickly falls down to 100KB/s sometimes to 20KB/s and sometimes remains
completely stalled. Moreover, the wifi connection is very often
disconnected (even when there is no tranfert of data at all).
It is not uncommon for a laptop's wifi to be on the USB bus. My Dell
laptop does precisely this (it is on one of the EHCI controllers).
Yes, it is a laptop Dell (latitude e6540)
Mine is a Inspiron N7110.
Why do I think that it an update issue?: 1- because this behaviour did
not happen before the update... 2- I have another laptop (exacttly the
same, same brand, same model) which I did not update and this issue does
not happen!
which of these packages could be responsible for this issue? I can
exclude the kernel, because I tested the problem with the previous one
(4.4.6) and NetworkManager* because I downgraded them.
There was a kernel 4.4.7-300 between 4.4.6 and 4.4.8. Did you test it?
Try rebooting into as many of your older kernels as you have and do the
test.
If the problem only appears on the 4.4.8 kernel, then my guess is that
kernel-modules for kernel 4.4.8-300 is the issue since that's where the
USB network and (some) disk drivers come from. I doubt if network
manager has anything to do with the problem as it simply manages
connections and has nothing to do with USB bus contention (which is
what you're probably seeing).
The problem is the same with all kernels: as soon as a hdd is plugged in
an usb port, the rate slows down and even the wifi connection stops. So
it is not a kernel modules problem.
Ok, it could (and I mean "_could_") be a firmware issue with the
underlying USB hardware. I can only suggest two things at this point.
Item 1: See if you can plug the HDD into a port that's on a different
USB device on the machine. You can use the "lsusb -t" utility (as root)
to show you a tree of what's on the USB ports. Mine looks like:
[root@golem4 ~]# lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
|__ Port 5: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 5: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 6: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 4: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 4: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
The first ehci device has both the bluetooth and wifi on it. The second
ehci device has the webcam on it. Try to plug the HDD into a port
that's not shared with the "wireless" stuff (verify with the lsusb
command). If you can find one, see if that helps.
Item 2: This might be a firmware issue on your laptop. Go to Dell's
site and see if there's an updated firmware version for your machine.
You can find the current version via (again, as root):
dmidecode -s bios-version
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- -- Larry Fine -
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