How to check DMA mode on SATA
dmesg |grep DMA
$ sudo dmesg |grep DMA
[ 0.000000] DMA 0x00000010 -> 0x00001000
[ 0.000000] DMA zone: 32 pages used for memmap
[ 0.000000] DMA zone: 0 pages reserved
[ 0.000000] DMA zone: 3951 pages, LIFO batch:0
[ 4.338031] ata1: SATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xffa0 irq 14
[ 4.338041] ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xffa8 irq 15
[ 4.664422] ata2.00: CFA: SILICONMOTION SM223AC, , max UDMA/66
[ 4.680417] ata2.00: configured for UDMA/66
DMA mode is activated by all SATA devices
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