Zero-copy network transmission with io

Zero-copy network transmission with io_uring

Posted Jan 1, 2022 11:14 UTC (Sat) by Sesse (subscriber, #53779)
In reply to: Zero-copy network transmission with io_uring by smurf
Parent article: Zero-copy network transmission with io_uring

But how is the behavior more predictable? What are you trying to achieve by waiting for the call to return? (Even more so if you put it in a thread; the context switch cost is going to be way higher than the data copy cost.)

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Zero-copy network transmission with io_uring

Posted Jan 1, 2022 12:30 UTC (Sat) by smurf (subscriber, #17840) [Link]

That depends how much data you have to copy and how you set up your threads.

Assume, for instance, that you are a server. You have a thread per client. You get a request, assemble the response, send it, then you free the data structure. An end-to-end-blocking send would obviate the need for copying the data to the kernel while not affecting anything else.

I do agree that doing the same thing is way more useful in an io_uring setup.