On Mon, Mar 18, 2013 at 3:52 PM, H. Peter Anvin <h...@zytor.com> wrote: > On 03/18/2013 02:25 PM, Yinghai Lu wrote: >> Current code does not set low range for crashkernel if the user >> does not specify that. >> >> That cause regressions on system that does not support intel_iommu >> properly. >> >> Chao said that his system does work well on 3.8 without extra parameter. >> even iommu does not work with kdump. >> >> Set crashkernel_low automatically if the user does not specify that. >> >> For system that does support IOMMU with kdump properly, user could >> specify crashkernel_low=0 to save that 72M low ram. >> >> -v3: add swiotlb_size() according to Konrad. >> >> Reported-by: WANG Chao <chaow...@redhat.com> >> Tested-by: WANG Chao <chaow...@redhat.com> >> Signed-off-by: Yinghai Lu <ying...@kernel.org> > > Can we get a bit more of an explanation instead of "and etc 8M"? At > least a hint of what kind of objects would go in there...
now only have: swiotlb overflow buffer v_overflow_buffer = alloc_bootmem_low_pages_nopanic( PAGE_ALIGN(io_tlb_overflow)); and /* * When the IOMMU overflows we return a fallback buffer. This sets the size. */ static unsigned long io_tlb_overflow = 32*1024; so it is 32K, and I round it to 8M. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/