<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">In the robaho version there is no setting of the socket send buffer - it uses the os default size. The 1mb buffer in user space is the same in both. Same with the baseline. </div><div dir="ltr"><br></div><div dir="ltr">The floating buffer is what causes the ENOBUFS in OSX - Linux does not exhibit this issue. </div><div dir="ltr"><br></div><div dir="ltr">That helidon is setting the kernel send buffer behind the scenes was not obvious to me. </div><div dir="ltr"><br></div><div dir="ltr">I will try and configure both to be be the same and rerun. </div><div dir="ltr"><br><blockquote type="cite">On Nov 10, 2023, at 5:25 AM, Alan Bateman <Alan.Bateman@oracle.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
On 10/11/2023 00:12, robert engels wrote:<br>
<blockquote type="cite" cite="mid:0727F3FD-53E6-4CC0-8547-6B3E1A89364C@ix.netcom.com">
Btw, I had a chance to check out Helidon 4.0 and the results are
mixed. I really like the programming model.
<div class=""><br class="">
</div>
<div class="">In a very simple (and probably not very meaningful
nor scientific) test <a href="https://urldefense.com/v3/__http://github.com/robaho/httpserver__;!!ACWV5N9M2RV99hQ!MaRcL-OkeTKhFMLWO41GoPNPaU62g46ixqLDPzafDqnq3M0aXR6wNkSkQ5LVZ3xZ8Q1ocjsybl6R9Mc9SA$" class="" moz-do-not-send="true">github.com/robaho/httpserver</a> outperforms
it by 2x. I couldn’t get it to work on Linux (see <a href="https://urldefense.com/v3/__https://github.com/helidon-io/helidon/issues/7983__;!!ACWV5N9M2RV99hQ!MaRcL-OkeTKhFMLWO41GoPNPaU62g46ixqLDPzafDqnq3M0aXR6wNkSkQ5LVZ3xZ8Q1ocjsybl5NK77uZQ$" class="" moz-do-not-send="true">https://github.com/helidon-io/helidon/issues/7983</a>),
which is strange given that they have very similar non-async
designs.</div>
<div class=""><br class="">
</div>
<div class="">The robaho httpserver achieves more than 6GB/sec on
Linux under the same conditions as reported in the issue.
Hopefully the Helidon team checks it out and makes some
recommendations or at least provides reasoning around the
performance issues.</div>
<br>
</blockquote>
<br>
If I read this correctly, this is comparing two HTTP servers that
serve up responses with a 1MB payload through the loopback
interface. <br>
<br>
For the Helidon case, it's Socket.write with the socket's send
buffer (SO_SNDBUF) set to 32k. The robaho server is using
SocketChannel.write channel's socket send buffer set to 1.3MB. You
probably need to configure them to be the same.<br>
<br>
-Alan<br>
</div></blockquote></body></html>