On 1/6/21 6:42 AM, Sieng Piaw Liew wrote: > We can increase the efficiency of rx path by using buffers to receive > packets then build SKBs around them just before passing into the network > stack. In contrast, preallocating SKBs too early reduces CPU cache > efficiency. > > Check if we're in NAPI context when refilling RX. Normally we're almost > always running in NAPI context. Dispatch to napi_alloc_frag directly > instead of relying on netdev_alloc_frag which does the same but > with the overhead of local_bh_disable/enable. > > Tested on BCM6328 320 MHz and iperf3 -M 512 to measure packet/sec > performance. Included netif_receive_skb_list and NET_IP_ALIGN > optimizations. > > Before: > [ ID] Interval Transfer Bandwidth Retr > [ 4] 0.00-10.00 sec 49.9 MBytes 41.9 Mbits/sec 197 sender > [ 4] 0.00-10.00 sec 49.3 MBytes 41.3 Mbits/sec receiver > > After: > [ ID] Interval Transfer Bandwidth Retr > [ 4] 0.00-30.00 sec 171 MBytes 47.8 Mbits/sec 272 sender > [ 4] 0.00-30.00 sec 170 MBytes 47.6 Mbits/sec receiver > > Signed-off-by: Sieng Piaw Liew <liew.s.p...@gmail.com>
Acked-by: Florian Fainelli <f.faine...@gmail.com> -- Florian
