我启用IOAT，但似乎没有数据传输使用DMA的networking：
我在BIOS中启用了IOAT。 CPU是Intel（R）Xeon（R）CPU E5-2650 v2 @ 2.60GHz。 我在ubuntu 14.04（3.11.0-26-generic）中加载了这个模块。 这是dmesg中的相关消息：
dmesg | grep ioat [ 7.314760] ioatdma: Intel(R) QuickData Technology Driver 4.00 [ 7.315893] ioatdma 0000:00:04.0: irq 186 for MSI/MSI-X [ 7.317850] ioatdma 0000:00:04.1: irq 187 for MSI/MSI-X [ 7.318319] ioatdma 0000:00:04.2: irq 188 for MSI/MSI-X [ 7.323282] ioatdma 0000:00:04.3: irq 189 for MSI/MSI-X [ 7.323567] ioatdma 0000:00:04.4: irq 190 for MSI/MSI-X [ 7.323855] ioatdma 0000:00:04.5: irq 191 for MSI/MSI-X [ 7.324134] ioatdma 0000:00:04.6: irq 192 for MSI/MSI-X [ 7.324400] ioatdma 0000:00:04.7: irq 193 for MSI/MSI-X [ 7.324759] ioatdma 0000:40:04.0: irq 194 for MSI/MSI-X [ 7.325197] ioatdma 0000:40:04.1: irq 195 for MSI/MSI-X [ 7.325559] ioatdma 0000:40:04.2: irq 196 for MSI/MSI-X [ 7.325828] ioatdma 0000:40:04.3: irq 197 for MSI/MSI-X [ 7.326091] ioatdma 0000:40:04.4: irq 198 for MSI/MSI-X [ 7.326361] ioatdma 0000:40:04.5: irq 199 for MSI/MSI-X [ 7.326620] ioatdma 0000:40:04.6: irq 200 for MSI/MSI-X [ 7.326886] ioatdma 0000:40:04.7: irq 201 for MSI/MSI-X 在bios中我找不到与DCA相关的任何选项，但这是dmesg | grep dca输出：
dmesg | grep dca [ 2.216975] dca service started, version 1.12.1
我发送了很多大的UDP数据包
for i in seq 4; do netperf -H 192.168.56.2 -p 12865 -t UDP_STREAM -l 20 -C -c -- -m 65000 -s 16M -S 16M -R 1 & done
但/ sys / class / dma /显示没有使用dma传输字节
/sys/class/dma# for i in `seq 0 16`; do cat dma${i}chan0/bytes_transferred; done 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0