On 04/06/2011 10:39 AM, John W. Linville wrote:
On Wed, Apr 06, 2011 at 05:05:19PM +0200, Gottfried Haider wrote:
Thanks for testing. I had hoped that the ping results could make a
light go on somewhere..
FWIW, the behaviour you described sounds a lot like bufferbloat.
Thanks John, I was looking forward to reading this soon.
But (without knowing about bufferbloat): would this manifest itself
only on the single network adapter? I am having no issues at all with
a Broadcom card on the same network or on the same machine when using
a USB-tethered phone to access the WiFi..
It depends on where the bottlenecks are in the network, and where the
"dark" buffers are too. I'm not sure how big the hardware tx ring
is for the rtl8192ce for example, or if it has any problems with
retries or whatever. I was mostly just observing that what you were
describing sounded like typical bufferbloat (i.e. high latency leading
to full big slow buffers) behavior. :-)
I have no idea what the hardware does internally, but rtl8192ce allocates 2 TX
software ring entries for the beacon queue, 256 for the best effort queue, and
128 for all others. It is not much different than b43, which allocates 256
entries for all queues.
Larry
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