Re: [PATCH] sky2: receive dma mapping error handling
From: Michael Breuer
Date: Sun Jan 31 2010 - 13:50:53 EST
On 1/30/2010 11:55 PM, Michael Breuer wrote:
On 01/30/2010 07:34 PM, Jarek Poplawski wrote:
I put a printk as a third else case in sky2_tx_unmap. Looks like the
issue is that a large number (perhaps all) calls to sky2_tx_unmap have
re->flags set to neither TX_MAP_SINGLE or TX_MAP_PAGE. Thus the elements
are never being unmapped.
With the default # entries & dma_debug_driver=sky2:
Could you try the patch below to show maybe some other users of
6:00 is eth0 & 4:00 is eth1.
Jan 30 23:53:14 mail kernel: DMA-API: 0000:06:00.0: entries: 31961
I suspect that the system collapses when using DMAR sooner than if not
using DMAR. Probably some hardware limitation on the number of mapped
elements that is less than the software limitation. I don't see at
present how a ring element can ever get to this code without re->flags
being set to one or the other.
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