On 4 August 2011 12:46, 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
What's dpkg like these days on btrfs - it used to be awfully slow. Some comparisons from the installed running system would really be needed. > 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. It doesn't sound like the description of development systems though where people will crash them and reset them and generally pull the plug on them. > So, what do people think about switching? To be honest I trust ext* (it's never lost me a byte in many years of use) and btr feels a bit new to me; but that's a personal feeling. Dave _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
