[FS#3674] WLAN transfer rate drops extreme under high load (Attachment added)

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FS#3674 - WLAN transfer rate drops extreme under high load
User who did this - Gerry K (renegat)

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I tried to reproduce the issue using iperf without success. 

Client connecting to odu3p, TCP port 5001
TCP window size:  153 KByte (default)
------------------------------------------------------------
[  3] local 192.168.200.208 port 50122 connected with 192.168.200.13 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-120.0 sec  1.31 GBytes  93.4 Mbits/sec


But when I try to copy some files via nfs-share using rsync bandwith drops after some seconds with approx. 10MB/s to 7MB/s than 2MB/s and vice versa.

Sometimes the WLAN connection is lost completely and the client has to reassociate with the router. No entries about this in logs.


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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3674#comment9478

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