Date: Mon, 24 Jul 2017 14:36:10 +0200 From: Ilya Bakulin <ilya@bakulin.de> To: Russell Haley <russ.haley@gmail.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: BBB & IMX6 Hummingboard SDIO driver Message-ID: <6f7abe006bb0f50bb27413676fc635c8@bakulin.de> In-Reply-To: <CABx9NuQCyS6c%2BrhkE4T_-7GdwpruO%2BsgCqJKTguxj0SGJ_qRRQ@mail.gmail.com> References: <CABx9NuR-ahQ3-PF2DV_6zAzMdFKhkyCt0b8%2BcyQ1KDBcaYHU=g@mail.gmail.com> <CABx9NuS89JcgzMkO0tq8gLFP64Rt3R-y3esaXHGu0%2BdW9XSU9A@mail.gmail.com> <703c195298dd3bbbd3abd53603758f14@bakulin.de> <CABx9NuRuC5xfgG2%2Bm4kq3fA90afJnd07ehcdAwrKnsqZv8R6dg@mail.gmail.com> <ac1f1ec6-0679-4732-c252-c3dbb81192f3@bakulin.de> <CABx9NuQCyS6c%2BrhkE4T_-7GdwpruO%2BsgCqJKTguxj0SGJ_qRRQ@mail.gmail.com>
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On 2017-07-23 00:34, Russell Haley wrote: > - My observation is that it's slow. I have no concrete data (yet) and > quite possibly have forgotten how slow Arm and SD cards really are. I > have hesitated to add your patch as I do want to test in various > states to collect data (i.e. regular BBB kernel, MMCCAM kernel, MMCCAM > kernel with changes). With the debugging prints turned on it's expected that everything is deadly slow. So please do `camcontrol debug off` before running any performance tests. Even without debugging stuff the old stack might be faster on at least UHS-I cards because the new stack doesn't yet support UHS-I. I've been doing some simple performance tests before, and performance both of the old and the new stack was limited by SD card, not by anything in code. -- Mit freundlichen Grüßen, Ilya Bakulinhome | help
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