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On 6/21/19 12:17 PM, Jonas Smedegaard
wrote:
Quoting Erik Josefsson (2019-06-21 09:28:38)On 6/19/19 3:38 AM, David Christensen wrote:The best way to answer your question regarding performance of a size N SD card vs. a size 2*N SD card is to buy two cards and benchmark them using your workload. Please publish your findings.Please find my four (4) findings below or at http://paste.debian.net/1088723 The only benchmark I know how to use is flashbench. But unfortunately I don't know how to interpret the resulting data.flashbench is for benchmarking page/erase-blocks/allocation-group (not transfer speed). My tool to generate images supports custom-aligned since April 28: https://salsa.debian.org/tinker-team/box/commit/be07a3a1b0-I That's great, but granted all 4 cards are optimized by your scripts, the question is if flashbench can tell me which one to pick? All of them work fine, but I want to spend time with the one that is best for "my workload", as suggested by David Christensen earlier in the thread. Maybe flashbench cannot tell me anything about that anyway? Are there other tools? //Erik |