Messages in this thread | | | Date | Tue, 06 Nov 2012 22:28:45 +0100 | From | Sören Moch <> | Subject | Re: [PATCH V2 1/4] arm: mvebu: increase atomic coherent pool size for armada 370/XP |
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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 already sent this bug report to m.szyprowski and gregory.clementearlier, but Sebastian suggested to send it to the mailing list and the responsible maintainers, too.
Please write to my e-mail directly if you have further questions or patches for me to test.
Regards, Soeren
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