Adding some more people to CC. On Tue, Jan 06, 2015 at 03:51:11PM +0100, Joerg Roedel wrote: > v1->v2: > > * Updated comments based on feedback from Konrad > * Added Acked-bys > * Rebased to v3.19-rc3 > > Hi, > > here is a patch-set to fix failed kdump kernel boots when > the systems was booted with crashkernel=X,high. On those > systems the kernel allocates only 72MiB of low-memory for > DMA buffers, which showed to be too low on some systems. > > The problem is that 64MiB of the low-memory is allocated by > swiotlb, leaving 8MB for the page-allocator. But swiotlb > tries to allocate DMA memory from the page-allocator first, > which fails pretty fast in the boot sequence, causing > warnings. This patch-set removes these warnings. > > But even the 64MiB for swiotlb are eaten up on some systems, > so that the default of low-memory allocated for the > crash-kernel is increase from 72MB to 256MB (only changing > the defaults, can still be overwritten by crashkernel=X,low). > > This number comes from experiments on the affected systems, > 128MiB low-memory was still not enough there, thus I set the > value to 256MiB to fix the issues. > > Any feedback appreciated. > > Thanks, > > Joerg > > Joerg Roedel (3): > swiotlb: Warn on allocation failure in swiotlb_alloc_coherent > x86, swiotlb: Try coherent allocations with __GFP_NOWARN > x86, crash: Allocate enough low-mem when crashkernel=high > > arch/x86/kernel/pci-swiotlb.c | 8 ++++++++ > arch/x86/kernel/setup.c | 5 ++++- > lib/swiotlb.c | 11 +++++++++-- > 3 files changed, 21 insertions(+), 3 deletions(-) > > -- > 1.9.1 > > Joerg Roedel (3): > swiotlb: Warn on allocation failure in swiotlb_alloc_coherent > x86, swiotlb: Try coherent allocations with __GFP_NOWARN > x86, crash: Allocate enough low-mem when crashkernel=high > > arch/x86/kernel/pci-swiotlb.c | 8 ++++++++ > arch/x86/kernel/setup.c | 5 ++++- > lib/swiotlb.c | 11 +++++++++-- > 3 files changed, 21 insertions(+), 3 deletions(-) > > -- > 1.9.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --
