On 09/10/2024 13:55, Mina Almasry wrote:
[...]
If not, I would like to see a comparison between TCP RX zerocopy and
this new io-uring zerocopy. For Google for example we use the TCP RX
zerocopy, I would like to see perf numbers possibly motivating us to
move to this new thing.
[1] https://lwn.net/Articles/752046/
Hi!
From my own testing, the TCP RX Zerocopy is quite heavy on the page
unmapping side. Since the io_uring implementation is expected to be
lighter (see patch 11), I would expect a simple comparison to show
better numbers for io_uring.
To be fair to the existing implementation, it would then be needed to be
paired with some 'real' computation, but that varies a lot. As we
presented in netdevconf this year, HW-GRO eventually was the best option
for us (no app changes, etc...) but still a case by case decision.
