updated TCP metrics descriptions according to kernel 4.15.rc6 source
Costa Tsaousis (ktsaou) committed
Jan 6, 2018 at 13:29 UTC
a2c09cd2bd3a3777692defd5c33761d886d752aa
1 file changed
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web/dashboard_info.js
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-8
@@ -690,24 +690,24 @@ netdataDashboard.context = {
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},
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'ipv4.tcpsock': {
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- info: 'The number of TCP connections (known as <code>CurrEstab</code>) with status <code>ESTABLISHED</code> or <code>CLOSE_WAIT</code>.'
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+ info: 'The number of established TCP connections (known as <code>CurrEstab</code>). This is a snapshot of the established connections at the time of measurement (i.e. a connection established and a connection disconnected within the same iteration will not affect this metric).'
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},
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'ipv4.tcpopens': {
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- info: '<b>active</b> or <code>ActiveOpens</code> is the number of <b>connections made</b> (i.e. connections that made a direct transition from <code>CLOSED</code> to <code>SYN-SENT</code>).'
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- + ' <b>passive</b> or <code>PassiveOpens</code> is the number of <b>connections received</b> (i.e. connections that made a direct transition from <code>LISTEN</code> to <code>SYN-RCVD</code>).'
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+ info: '<b>active</b> or <code>ActiveOpens</code> is the number of outgoing TCP <b>connections attempted</b> by this host.'
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+ + ' <b>passive</b> or <code>PassiveOpens</code> is the number of incoming TCP <b>connections accepted</b> by this host.'
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},
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'ipv4.tcperrors': {
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- info: '<code>InErrs</code> is the number of TCP segments received in error.'
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- + ' <code>InCsumErrors</code> is the number of TCP segments received with checksum errors.'
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+ info: '<code>InErrs</code> is the number of TCP segments received in error (including header too small, checksum errors, sequence errors, bad packets - for both IPv4 and IPv6).'
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+ + ' <code>InCsumErrors</code> is the number of TCP segments received with checksum errors (for both IPv4 and IPv6).'
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+ ' <code>RetransSegs</code> is the number of TCP segments retransmitted.'
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},
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'ipv4.tcphandshake': {
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- info: '<code>EstabResets</code> is the number of established connections resets (i.e. connections that made a direct transition from <code>ESTABLISHED</code> to <code>CLOSED</code>).'
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- + ' <code>OutRsts</code> is the number of TCP segments sent, with the <code>RST</code> flag set.'
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- + ' <code>AttemptFails</code> is the number of times TCP connections made a direct transition from either <code>SYN-SENT</code> or <code>SYN-RCVD</code> to <code>CLOSED</code>, plus the number of times TCP connections made a direct transition from the <code>SYN-RCVD</code> to <code>LISTEN</code>.'
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+ info: '<code>EstabResets</code> is the number of established connections resets (i.e. connections that made a direct transition from <code>ESTABLISHED</code> or <code>CLOSE_WAIT</code> to <code>CLOSED</code>).'
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+ + ' <code>OutRsts</code> is the number of TCP segments sent, with the <code>RST</code> flag set (for both IPv4 and IPv6).'
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+ + ' <code>AttemptFails</code> is the number of times TCP connections made a direct transition from either <code>SYN_SENT</code> or <code>SYN_RECV</code> to <code>CLOSED</code>, plus the number of times TCP connections made a direct transition from the <code>SYN_RECV</code> to <code>LISTEN</code>.'
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+ ' <code>TCPSynRetrans</code> shows retries for new outbound TCP connections, which can indicate general connectivity issues or backlog on the remote host.'
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},
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