On 22.12.2013 21:26, Vladimir 'φ-coder/phcoder' Serbinenko wrote: > Hello, all. While testing on raspberry pi using standalone image I've > noticed that all file operations were sluggish. The culprit was tar that > we use as a filesystem for memdisk which requires complete scan to find > one file. On most systems it's a minor time penalty but on raspberry pi > it almost halved boot time. I propose a specialised compact and fast > uncompressed read-only filesystem by storing filenames in sorted array > and using binary search. It's a pretty big change but I feel like it's > worth to be put into 2.02. > Does anybody disagree? > After discussing with Leif Lindholm, it was found out that real culprit was disabled cache on U-boot port. Time to console Cached, tar: 0.5s Cached, greffs: 0.3s Uncached tar: 7.3s Uncached greffs: 4.3s On coreboot the speed-up is only 4ms
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