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[73.185.129.58]) by smtp.googlemail.com with ESMTPSA id y18sm12685362ilg.82.2020.03.11.20.10.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2020 20:10:02 -0700 (PDT) Subject: Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver (UPDATED) To: Dave Taht References: <20200306042831.17827-1-elder@linaro.org> From: Alex Elder Message-ID: Date: Wed, 11 Mar 2020 22:09:56 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200311_201004_162774_28B80D26 X-CRM114-Status: GOOD ( 20.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Ohad Ben-Cohen , Susheel Yadav Yadagiri , Eric Caruso , Arnd Bergmann , devicetree@vger.kernel.org, Dan Williams , Linux Kernel Network Developers , linux-kernel@vger.kernel.org, Rob Herring , Bjorn Andersson , Siddharth Gupta , Andy Gross , Evan Green , linux-arm-kernel , linux-arm-msm@vger.kernel.org, Subash Abhinov Kasiviswanathan , Johannes Berg , linux-soc@vger.kernel.org, David Miller , Chaitanya Pratapa Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/9/20 11:54 AM, Dave Taht wrote: > I am happy to see this driver upstream. > >> Arnd's concern was that the rmnet_data0 network device does not >> have the benefit of information about the state of the underlying >> IPA hardware in order to be effective in controlling TX flow. >> The feared result is over-buffering of TX packets (bufferbloat). >> I began working on some simple experiments to see whether (or how >> much) his concern was warranted. But it turned out that completing >> these experiments was much more work than had been hoped. > > Members of the bufferbloat project *care*, and have tools and testbeds for > exploring these issues. It would be good to establish a relationship with > the vendor, obtain hardware, and other (technical and financial) support, if > possible. > > Is there any specific hardware now available (generally or in beta) that > can be obtained by us to take a harder look? A contact at linaro or QCA > willing discuss options? There exists some hardware that could be used, but at the moment I have not ported this code to operate on it. It is a current effort however, and I will be glad to keep you in the loop on progress. There are a couple of target environments we'd like to support but until last week the primary goal was inclusion in the upstream tree. I will follow up with you after the dust settles a little bit with this patch series, maybe in a week or so. In the mean time I'll also find out whether there are any other resources (people and/or hardware) available. -Alex _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel