Hi Sujuan, > Yes, it is so expensive, but if no memcopy, it will casue memory > fragmentation (we hit this issue in internal SQC). > > as we know, wed needs to exchange rx pkt(belongs to wed rx buffer > manager) with wifi driver(dma rx data queue) by exchanging wfdma dmad > to ensure the free wed rx buffer. > > it is possiable that a large number of buffer has been exchanged to wed > and can not come back to wlan driver. So, the memory from the same 32K > page cache is unable to be released, and it will be failed at > page_frag_alloc in mt76_dma_rx_fill. > > Any ideas but memcopy? A simple solution would be to simply allocate single pages, or half-page fragments. - Felix
