Messages in this thread | | | Date | Mon, 15 Apr 96 12:21:35 PDT | From | (Bob Felderman) | Subject | Caches and DMA with PPro |
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I'm running 1.3.88 on a Micron 180MHz PentiumPro machine. It appears that our network board is DMAing stale data when transmitting a packet and/or the host is reading stale data after a pakcet is received.
I've looked at the flush_cache_xxx() code in pgtable.h and it has the following code.
/* Caches aren't brain-dead on the intel. */ #define flush_cache_all() do { } while (0) #define flush_cache_mm(mm) do { } while (0) #define flush_cache_range(mm, start, end) do { } while (0) #define flush_cache_page(vma, vmaddr) do { } while (0)
I've tried disabling the caches from the BIOS setup, but the performance of the system and the behavior is unchanged, so I suspect the BIOS isn't really turning off the caches.
This is with a network card that is doing DMA on the PCI bus. Have others found that other networking cards work fine on the PPro with linux-1.3.xx?
Bob
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