Update cheatsheets

iperf

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# iperf
+
+> Measure network bandwidth between computers.
+> More information: <https://iperf.fr>.
+
+- Run on server:
+
+`iperf -s`
+
+- Run on server using UDP mode and set server port to listen on 5001:
+
+`iperf -u -s -p {{5001}}`
+
+- Run on client:
+
+`iperf -c {{server_address}}`
+
+- Run on client every 2 seconds:
+
+`iperf -c {{server_address}} -i {{2}}`
+
+- Run on client with 5 parallel threads:
+
+`iperf -c {{server_address}} -P {{5}}`
+
+- Run on client using UDP mode:
+
+`iperf -u -c {{server_address}} -p {{5001}}`