Messages in this thread | | | Date | Tue, 6 Nov 2012 23:32:57 +0100 | From | Andrew Lunn <> | Subject | Re: [PATCH V2 1/4] arm: mvebu: increase atomic coherent pool size for armada 370/XP |
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On Tue, Nov 06, 2012 at 10:28:45PM +0100, S?ren Moch wrote: > resent as plain text, sorry. > > > > For Armada 370/XP we have the same problem that for the commit > > cb01b63, so we applied the same solution: "The default 256 KiB > > coherent pool may be too small for some of the Kirkwood devices, so > > increase it to make sure that devices will be able to allocate their > > buffers with GFP_ATOMIC flag" > > I see a regression from linux-3.5 to linux-3.6 and think there might > be a fundamental problem > with this patch. On my Kirkwood system (guruplug server plus) with > linux-3.6.2 I see following > errors and corresponding malfunction even with further increased > (2M, 4M) pool size: > > Oct 19 00:41:22 guru kernel: ERROR: 4096 KiB atomic DMA coherent > pool is too small! > Oct 19 00:41:22 guru kernel: Please increase it with coherent_pool= > kernel parameter! > > So I had to downgrade to linux-3.5 which is running without problems. > > I use SATA and several DVB sticks (em28xx / drxk and dib0700).
I'm guess its the DVB sticks which are causing the problems. We have a number of kirkwood devices with two SATA devices which had problems until we extended the coherent_pool. The DVB sticks are probably take more coherent RAM. There was also an issue found recently:
http://www.spinics.net/lists/arm-kernel/msg203962.html
That conversation has gone quiet, but that could be because the participants are at ELCE.
Andrew
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