Date: Wed, 18 Sep 2024 21:01:16 +0800 From: dashuai wu <wds24@mails.tsinghua.edu.cn> To: freebsd-net@freebsd.org Subject: Does the UDP socket in FreeBSD actually use a send buffer to store packets like Linux? Message-ID: <9a1e0b13-e06f-46aa-8174-4b80eea4473a@mails.tsinghua.edu.cn>
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I noticed that FreeBSD does not have kernel parameters for adjusting the send buffer size like Linux does. The parameter kern.ipc.maxsockbuf does not seem to affect UDP sending behavior in this thread(https://forums.freebsd.org/threads/increase-buffer-with-maxsockbuf-for-udp-streaming.75981/). While reading the source code, I found that the UDP socket seems to only use the buffer size to determine if a single message is too large, and it does not track the amount of buffer space already used. So, does the UDP socket in FreeBSD actually have a send buffer like Linux? If yes, where can I find the source code about it? Thanks all for your time. - Dashuai Wu
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