Re: [Nouveau] DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ?
On Fri, Aug 16, 2019 at 4:31 PM Corentin Labbe 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 ___ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau
Re: [Nouveau] DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ?
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. That is a lot and apparently overwhelm the dma-debug tracking. Robin rewrote this code in Linux 4.21 to work a little better, so I'm curious why this might have changes in 4.19, as dma-debug did not change at all there. ___ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau
Re: [Nouveau] DMA-API: cacheline tracking ENOMEM, dma-debug disabled due to nouveau ?
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. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch ___ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau