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Date: Mon, 29 Apr 2019 20:30:06 +0200 (CEST)
From: Wojciech Puchar <wojtek@puchar.net>
To: freebsd-hackers@freebsd.org
Subject: very low performance tcp/rsh
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i tried

rsh -l user localhost "cat /dev/zero" >/dev/null

got 300MB/s or machine that can do memcpy at 10GB/s (with 1GB blocks 
- no cache) single threaded.

what limits the performance