Nick Hudson <skrll%netbsd.org@localhost> writes: > This is just a symptom of how usb network vs non-usb network drivers > work. Expanding on this, it is typical for PCI network drivers (e.g. bnx, wm) to allocate many mbufs/clusters (256 or 512 per interface) and place the clusters in the receive descriptor ring, allowing the interface to DMA packets when they arrive, and then interrupt which has the driver send the packets up the stack and replenish the waiting memory. So really the odd thing is that idle systems with PCI interfaces tend to have buffers in use.
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