Posted April 3, 201410 yr We are constantly writing images from a camera at 4MBytes/s to an SD card (SLC, ext4). After we start writing, the CPU usage jumps by 15-20 percent and stays there. These writes are spread across up to 13 open file handles. I am using a Texas Instruments distro of kernel 3.2.0 on an embedded ARM platform. My understanding is that the writes should mostly be taken care of using DMA, so I am wondering why such high CPU utilization? Bryce Continue reading...
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