On Thu, 4 Aug 2011 12:46:58 +0100 James Tunnicliffe <james.tunnicli...@linaro.org> wrote:
> Hi, > > Our current default root file system, ext3, is proving to be a > bottleneck for SD card performance. Not only does it take a long time > to format the partitions, but it also takes a long time to write to. > This slows down creating images on SD cards a lot. I just did a very > simple experiment running linaro-media-create, writing an Ubuntu > Desktop image to an SD card: > > ext3: > 139.85user 35.27system 44:03.58elapsed 6%CPU (0avgtext+0avgdata > 107360maxresident)k > 2876115inputs+7048200outputs (958major+1677659minor)pagefaults 0swaps > > btrfs: > 146.52user 34.48system 19:57.16elapsed 15%CPU (0avgtext+0avgdata > 107408maxresident)k > 4417521inputs+6542992outputs (138major+1779874minor)pagefaults 0swaps > > As I understand it, btrfs is considered OK for file systems running on > systems that don't suffer from power failure, so for writing an image > and testing it this should be fine. > > So, what do people think about switching? There were few concerns already expressed, so I just add: is btrfs supported out of the box by kernels in last ~3 Ubuntu releases? Because if one can't look at/change contents produced on an SD card, that undermines purpose of evaluation builds much. Those ext3 vs btrfs results are very vivid though, but I wonder if it makes sense to try to tweak ext3 & mount options. And after all, we could prepare partition image(s) on the local HDD and dd them to a card... -- Best Regards, Paul Linaro.org | Open source software for ARM SoCs Follow Linaro: http://www.facebook.com/pages/Linaro http://twitter.com/#!/linaroorg - http://www.linaro.org/linaro-blog _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
