On 01/19/2012 05:55 AM, Jim Abernathy wrote: > On 01/18/2012 04:34 PM, Darren Hart wrote: >> >> On 01/18/2012 09:05 AM, Jim Abernathy wrote: >> >>> FYI for those wanting to use Soft RAID, make sure you create one very >>> small primary partition for GRUB2 to put the second part of the >>> boot-loader in. Can't use the old process. >> I strongly recommend using a separate DISK for your OS installation. >> Yocto builds are hard on disks, and RAID 0 increases your risk of >> failure in exchange for the added performance. I use a small SSD for my >> OS disk and a large RAID0 array of spinning disks for /build and another >> array for /virt (where my VM images live - easily recreated). >> > Learned a few things in this process. I appreciate all the help and advice. > > 1. So we know that at least with Edison, btrfs does not work with bitbake. > 2. When I rebuilt the system, this time I put the Linux root directory > on an 80GB SSD. That is where I also have my clone of Linux-Yocto > repository, poky, and download directory , DL_DIR. > 3. I have create /build with EXT4 format on a Software RAID 0 (striped) > partition, using 2 separate hard drives, to use as the working > build directory for bitbake. I have a striped swap file on the same > two drives. But with 8GB or RAM, I shouldn't be using that much. > > My build times for some of the basic meta-intel BSPs is around 103 minutes.
You may be able to improve upon that with the following in /etc/fstab: /dev/md0 /build ext4 noauto,noatime,nodiratime,commit=6000 0 2 This reduces the number of writes due to updated access time and increases the commit interval so it doesn't stall while writing out every 5 minutes per default. NOTE: THIS INCREASES YOUR RISK OF DATA LOSS If your machine goes down during a build, you should plan on formatting that drive. If you only keep builds on it, they easily recreateable and you may find the performance boost is worth the risk. -- Darren Hart Intel Open Source Technology Center Yocto Project - Linux Kernel _______________________________________________ yocto mailing list yocto@yoctoproject.org https://lists.yoctoproject.org/listinfo/yocto
