[erlang-questions] UDP receive performance

[Lukas Larsson]

Hello!

On Wed, Jun 13, 2018 at 11:08 PM Jonas Falkevik <
jonas.falkevik@REDACTED> wrote:

> Hi,
> I think I was able to reproduce this problem.
> And to me it looks like a bug.
> On my system the packet_inet_input is called but the recv call returns
> eagain.
> This isn’t freeing the buffer so the realloc (intended for fragments?) are
> trigged.
> Reallocating the same size buffer again.
>
> The below branch with the below change reduced the reallocs on my linux
> system.
> https://github.com/falkevik/otp/tree/udp_performance_bug
>
>
> https://github.com/falkevik/otp/commit/ca08458a0663792390d5e89f83b883e19a33054c
>
>
Interesting... I wonder if maybe it wouldn't be better to solve this
problem in the code for realloc so that no copy is done when a realloc of
the same size if issued... that way we solve it in all places instead of
only in the inet_driver

Lukas
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