Hello Nikolaus, "Demmel Nikolaus (BOSP/PAR)": > we are using AUFS for our root filesystem with an tmpfs overlay and recentl= > y wanted to switch to a kernel with PREEMPT_RT patch. Unfortunately, it see= > ms that mounting aufs seems to hang about 40% of the time during boot (ther= > e is no specific kernel or log message). When it comes up, it seems to work= > correctly.
Do you mean that mounting aufs took very long time and your system runs flawlessly after that? Interesting... My first suggestion to see what is going on is "strace -T -f mount -t aufs ..." which will give us a hint. Sometimes people sets aufs FHSM feature incorrectly. That setting/configuration should match in kernel-space and user-space. If it doesn't match, it will take a long time in mounting aufs unexpectedly. When FHSM is enabled both in kernel and user-space, then it will take a long time too. But it is an expected behaviour. > In order to get AUFS to compile, we needed to apply the following additiona= > l patch: https://github.com/beagleboard/linux/pull/108/commits/ad740435f28e= > 3ffb5d73a419086b0b6fd3bc7240 Hmm, this patch reminds me a post from Daniel Vidal in May 2013 (the patch looks different from what I suggested, though). Refer to http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg04210.html and its thread. Next time when you post, tell me the version of patches you are using and the URL where I can get all of thme. J. R. Okajima ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi
