On Fri, Aug 16, 2019 at 4:31 PM Corentin Labbe <clabbe.montjoie@xxxxxxxxx> wrote: > On Wed, Aug 14, 2019 at 07:49:27PM +0200, Daniel Vetter wrote: > > On Wed, Aug 14, 2019 at 04:50:33PM +0200, Corentin Labbe wrote: > > > Hello > > > > > > Since lot of release (at least since 4.19), I hit the following error message: > > > DMA-API: cacheline tracking ENOMEM, dma-debug disabled > > > > > > After hitting that, I try to check who is creating so many DMA mapping and see: > > > cat /sys/kernel/debug/dma-api/dump | cut -d' ' -f2 | sort | uniq -c > > > 6 ahci > > > 257 e1000e > > > 6 ehci-pci > > > 5891 nouveau > > > 24 uhci_hcd > > > > > > Does nouveau having this high number of DMA mapping is normal ? > > > > Yeah seems perfectly fine for a gpu. > > Note that it never go down and when I terminate my X session, it stays the same. > So without any "real" GPU work, does it is still normal to have so many active mapping ? Might just be the dma_alloc cache. It should go down under memory pressure I think. Otherwise might also be a leak. > For example, when doing some transfer, the ahci mapping number changes and then always go down to 6. gpu drivers tend to cache everything, all the time ... -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
