On Wed, Nov 09, 2022 at 02:37:42PM +0800, Dust Li wrote: > > Haven't dive into your test case yet, but the performance data > looks disappointing > > I don't know why we need zerocopy if we can't get a big performance > gain. The cited numbers are intended to show that there is no network bandwidth performance drop from using RECV_ZC. For the systems under test (25Gb, 50Gb), we are getting linerate already, so there wouldn't be any BW improvement. The zerocopy gains come from a reduction in memory bandwith, removing the user memcpy overhead, reducing the CPU usage. This is why I put up the changes for iperf3, so cpu and membw usage metrics can be collected while under network load. > Have you tested large messages with jumbo or LRO enabled ? Haven't tested jumbo frames, but these are with GRO support. -- Jonathan
