Date: Mon, 28 Feb 2005 13:21:37 +0200 From: Urmas Lett <urmas.lett@eenet.ee> To: freebsd-net@freebsd.org Subject: kern.hz and single tcp connection throughput Message-ID: <6.1.2.0.2.20050228131836.01ba4280@muheleja.eenet.ee>
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Hello, I was playing with iperf over ~500km empty gigabit link. FreeBSD 5.3-STABLE kern.hz="100" (default) root@test2:~# iperf -c x.x.x.x ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local y.y.y.y port 56931 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 28.8 MBytes 24.1 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 64k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 57926 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 28.3 MBytes 23.6 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 128k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 129 KByte (WARNING: requested 128 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 64330 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 29.0 MBytes 24.2 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 256k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 257 KByte (WARNING: requested 256 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 55575 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 31.2 MBytes 26.0 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 512k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 513 KByte (WARNING: requested 512 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 59043 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.2 sec 30.0 MBytes 24.7 Mbits/sec ============================================================ kern.hz="1000" root@test2:~# iperf -c x.x.x.x ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local y.y.y.y port 61402 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 44.5 MBytes 37.3 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 64k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 62718 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 87.9 MBytes 73.7 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 128k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 129 KByte (WARNING: requested 128 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 50571 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 169 MBytes 142 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 256k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 257 KByte (WARNING: requested 256 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 61072 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 305 MBytes 255 Mbits/sec root@test2:~# iperf -c x.x.x.x -w 512k ------------------------------------------------------------ Client connecting to x.x.x.x, TCP port 5001 TCP window size: 513 KByte (WARNING: requested 512 KByte) ------------------------------------------------------------ [ 3] local y.y.y.y port 62887 connected with x.x.x.x port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.5 sec 451 MBytes 362 Mbits/sec
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