Return-path: Received: from charlotte.tuxdriver.com ([70.61.120.58]:43031 "EHLO smtp.tuxdriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932079Ab1DFPpT (ORCPT ); Wed, 6 Apr 2011 11:45:19 -0400 Date: Wed, 6 Apr 2011 11:39:18 -0400 From: "John W. Linville" To: Gottfried Haider Cc: Larry Finger , linux-wireless@vger.kernel.org Subject: Re: rtl8192ce: odd ping behavior Message-ID: <20110406153918.GF11941@tuxdriver.com> References: <4D9B5473.6040003@lwfinger.net> <20110406145700.GC11941@tuxdriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-wireless-owner@vger.kernel.org List-ID: 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. :-) John -- John W. Linville Someday the world will need a hero, and you linville@tuxdriver.com might be all we have. Be ready.