On 10/9/24 10:50 AM, Jens Axboe wrote: > On 10/9/24 10:35 AM, David Ahern wrote: >> On 10/9/24 9:43 AM, Jens Axboe wrote: >>> Yep basically line rate, I get 97-98Gbps. I originally used a slower box >>> as the sender, but then you're capped on the non-zc sender being too >>> slow. The intel box does better, but it's still basically maxing out the >>> sender at this point. So yeah, with a faster (or more efficient sender), >> >> I am surprised by this comment. You should not see a Tx limited test >> (including CPU bound sender). Tx with ZC has been the easy option for a >> while now. > > I just set this up to test yesterday and just used default! I'm sure > there is a zc option, just not the default and hence it wasn't used. > I'll give it a spin, will be useful for 200G testing. I think we're talking past each other. Yes send with zerocopy is available for a while now, both with io_uring and just sendmsg(), but I'm using kperf for testing and it does not look like it supports it. Might have to add it... We'll see how far I can get without it. -- Jens Axboe
