[bbkane]

Hmm in the 2025 talk ( https://youtu.be/f30PceqQWko?si=qZESxMaSyt7fYMfz ), Andrew emphasizes that this approach is more efficient than before- even showing compiled assembly iirc. I guess that was a one-off?

[chaz72]

My guess is that one of these (Andrew) is measuring syscalls and the other is measuring vtable indirections.

[kristoff_it]

A vtable indirection is essentially free when you're going to perform a syscall. What matters is that the buffer is above the vtable (which is already the case for the current implementation) so that you don't pay for the indirection when hitting the buffer.

[chaz72]

Apples and oranges, yeah. I should have spelled that out more, thanks.

[rastignack]

And if you write to a bytes buffer?