On 22/05/14 20:59, Eric Dumazet wrote: > On Thu, 2014-05-22 at 20:39 +0100, Jim Baxter wrote: > >> I now think that the correct solution here is to create a new smaller >> skb and copy the data from the sub packets into it. > > For low speed devices, this is indeed the best way. > > (this is called copybreak in some nic drivers) > > > Thank you Eric. It is USB device that can handle 480Mbits/s so a middle speed device. It looks like it is the normal trade off of speed versus memory. Either I can use skb_clone for speed but that will impact memory with multiple skb's of 16k or I copy the data to keep the memory usage low. Though copying 2k of data into an skb will not likely be a massive overhead. Jim -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
