On Mon, 13 Jan 2014 07:30:33 -0600 Cliff Wickman <cpw at sgi.com> wrote: > On Mon, Jan 13, 2014 at 10:58:31AM +0100, Michael Holzheu wrote: > > On Fri, 10 Jan 2014 11:58:30 -0600 > > Cliff Wickman <cpw at sgi.com> wrote: > > > > [snip] > > > > > Use O_DIRECT (raw) i/o for the dump and for the bitmaps file, so that writing > > > to those files does not allocate kernel memory for page cache. > > > > Hello Cliff, > > > > Have you tested O_DIRECT together with the new vmcore mmap interface? > > IIRC when we tried O_DIRECT together with mmap for some reason it did > > not work. > > > > Michael > > Hi Michael, > > How new of a kernel do I need? i.e. how 'new' of an mmap interface? > The latest kernel I used was 3.0.93 (sle11sp3). > And makedumpfile was 1.5.5. I think sles11 SP3 does not support mmap for /proc/vmcore. Upstream you need at least kernel 3.11. For makedumpfile version 1.5.5 should be ok. Michael
