<div dir="ltr">Suppose TCP_NODELAY sock opt can prevent Nagle join small packets?</div><br><div class="gmail_quote"><div dir="ltr">On Wed, Jul 13, 2016 at 11:10 AM Andrey Sverdlichenko <<a href="mailto:blaze@ruddy.ru">blaze@ruddy.ru</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Wed, Jul 13, 2016 at 3:14 AM Ruben Astudillo <<a href="mailto:ruben.astud@gmail.com" target="_blank">ruben.astud@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Right on the nail. I played a bit with tcpdump/wireshark to see I was<br>
just sending 0 length ACKs and multiple 4 byte messages joined on a<br>
single packet. Seems TCP buffers tiny packets using a strategy called<br>
Nagle's algorithm and thus joined all my packets on a bufferzone until a<br>
threeshold. Then it sent them all at once, making the other end crazy.<br></blockquote><div><br></div></div></div><div dir="ltr"><div dir="ltr"><div class="gmail_quote"><div>This looks a bit scary. It should not matter if replies are merged or not.<br>By any chance, don't your code use recv with some large max buffer size, but expect to get only 4 bytes because this is how much receiver sends each time? If so, change it to read 4 bytes only, and handle the case when less than 4 bytes are out. TCP do not preserve message boundaries and you can expect reads to return data in arbitrary sized chunks.</div><div><br></div><div>Regards,</div><div> Andrey</div></div></div></div>
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