Module Name: src Committed By: jmcneill Date: Sun Apr 19 21:23:01 UTC 2015
Modified Files: src/sys/arch/arm/amlogic: amlogic_sdhc.c Log Message: The Amlogic SDHC controller doesn't support SG DMA. When we advertise DMA but not SG DMA support, the sdmmc layer breaks up transfers into multiple PAGE_SIZE (8KB here) transfers. Remove the DMA capability flag and do transfers through a MAXPHYS-sized buffer instead. This lets us do larger transfers and even with the memcpy, still a significant win for performance. Before: 134217728 bytes transferred in 15.301 secs (8771827 bytes/sec) After: 134217728 bytes transferred in 8.834 secs (15193313 bytes/sec) To generate a diff of this commit: cvs rdiff -u -r1.4 -r1.5 src/sys/arch/arm/amlogic/amlogic_sdhc.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.