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Request #72066 Lack of TCP_NODELAY causes sockets to be horribly slow
Submitted: 2016-04-20 20:24 UTC Modified: 2016-04-29 12:42 UTC
From: slawek1211 at gmail dot com Assigned: krakjoe (profile)
Status: Closed Package: Streams related
PHP Version: 7.0.5 OS: Linux, all flavours
Private report: No CVE-ID: None
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 [2016-04-20 20:24 UTC] slawek1211 at gmail dot com 
Description:
------------
On loopback interfaces, where MTU is set to 65536 on modern linux flavours, lack of support to open persistent, nodelay sockets makes fast, 2-way, local communication impossible for small packets (15-30kb) due to very high latency.

While pfsockopen cannot be set to TCP_NODELAY mode, sockopen doesn't support persistency, so it's like nothing supports all features needed for fast 2-way communication.

Expected result:
----------------
Ability to set TCP_NODELAY on pfsockopen, or some function to access underlying socket, so this option could be set using socket_set_option

Actual result:
--------------
Lack of TCP_NODELAY support results in a situation that sending 20kb of data using loopback with high MTU could take 30-40ms.

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 [2016-04-29 12:42 UTC] krakjoe@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: krakjoe
 [2016-04-29 12:42 UTC] krakjoe@php.net 
socket_import_stream should do the trick :)
 
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