On Wed, Jan 16, 2013 at 06:05:59PM +0100, Soeren Moch wrote: > On 16.01.2013 16:50, Jason Cooper wrote: > >On Wed, Jan 16, 2013 at 09:55:55AM +0100, Soeren Moch wrote: > >>On 16.01.2013 04:24, Soeren Moch wrote: > >>>On 16.01.2013 03:40, Jason Cooper wrote: > >>>>On Wed, Jan 16, 2013 at 01:17:59AM +0100, Soeren Moch wrote: > >>>>>On 15.01.2013 22:56, Jason Cooper wrote: > >>>>>>On Tue, Jan 15, 2013 at 03:16:17PM -0500, Jason Cooper wrote: > > > >>OK, I could trigger the error > >> ERROR: 1024 KiB atomic DMA coherent pool is too small! > >> Please increase it with coherent_pool= kernel parameter! > >>only with em28xx sticks and sata, dib0700 sticks removed. > > > >Did you test the reverse scenario? ie dib0700 with sata_mv and no > >em28xx. > > Maybe I can test this next night. Please do, this will tell us if it is in the USB drivers or lower (something in common). > >>>>What would be most helpful is if you could do a git bisect between > >>>>v3.5.x (working) and the oldest version where you know it started > >>>>failing (v3.7.1 or earlier if you know it). > >>>> > >>>I did not bisect it, but Marek mentioned earlier that commit > >>>e9da6e9905e639b0f842a244bc770b48ad0523e9 in Linux v3.6-rc1 introduced > >>>new code for dma allocations. This is probably the root cause for the > >>>new (mis-)behavior (due to my tests 3.6.0 is not working anymore). > >> > >>I don't want to say that Mareks patch is wrong, probably it triggers a > >>bug somewhere else! (in em28xx?) > > > >Of the four drivers you listed, none are using dma. sata_mv is the only > >one. > > usb_core is doing the actual DMA for the usb bridge drivers, I think. Yes, my mistake. I'd like to attribute that statement to pre-coffee rambling. :-) > >If one is to believe the comments in sata_mv.c:~151, then the alignment > >is wrong for the sg_tbl_pool. > > > >Could you please try the following patch? > > OK, what should I test first, the setup from last night (em28xx, no > dib0700) plus your patch, or the reverse setup (dib0700, no em28xx) > without your patch, or my normal setting (all dvb sticks) plus your > patch? if testing time is limited, please do the test I outlined at the top of this email. I've been digging more into the dma code and while I think the patch is correct, I don't see where it would fix your problem (yet). thx, Jason. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>