Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe
From: Eric Dumazet <hidden>
Date: 2014-02-12 04:17:46
Also in:
lkml
On Tue, 2014-02-11 at 18:07 -0800, Dan Williams wrote:
The overlap granularity is too large. Multiple dma_map_single mappings are allowed to a given page as long as they don't collide on the same cache line.
I am not sure why you try number of mappings of a page. Try launching 100 concurrent netperf -t TCP_SENFILE Same page might be mapped more than 100 times, more than 10000 times in some cases.