diff options
Diffstat (limited to 'Documentation/networking/snmp_counter.rst')
| -rw-r--r-- | Documentation/networking/snmp_counter.rst | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/Documentation/networking/snmp_counter.rst b/Documentation/networking/snmp_counter.rst index 38a4edc4522b..423d138b5ff3 100644 --- a/Documentation/networking/snmp_counter.rst +++ b/Documentation/networking/snmp_counter.rst @@ -314,7 +314,7 @@ https://lwn.net/Articles/576263/ * TcpExtTCPOrigDataSent This counter is explained by `kernel commit f19c29e3e391`_, I pasted the -explaination below:: +explanation below:: TCPOrigDataSent: number of outgoing packets with original data (excluding retransmission but including data-in-SYN). This counter is different from @@ -324,7 +324,7 @@ explaination below:: * TCPSynRetrans This counter is explained by `kernel commit f19c29e3e391`_, I pasted the -explaination below:: +explanation below:: TCPSynRetrans: number of SYN and SYN/ACK retransmits to break down retransmissions into SYN, fast-retransmits, timeout retransmits, etc. @@ -332,7 +332,7 @@ explaination below:: * TCPFastOpenActiveFail This counter is explained by `kernel commit f19c29e3e391`_, I pasted the -explaination below:: +explanation below:: TCPFastOpenActiveFail: Fast Open attempts (SYN/data) failed because the remote does not accept it or the attempts timed out. @@ -382,7 +382,7 @@ Defined in `RFC1213 tcpAttemptFails`_. Defined in `RFC1213 tcpOutRsts`_. The RFC says this counter indicates the 'segments sent containing the RST flag', but in linux kernel, this -couner indicates the segments kerenl tried to send. The sending +counter indicates the segments kernel tried to send. The sending process might be failed due to some errors (e.g. memory alloc failed). .. _RFC1213 tcpOutRsts: https://tools.ietf.org/html/rfc1213#page-52 @@ -700,7 +700,7 @@ SACK option could have up to 4 blocks, they are checked individually. E.g., if 3 blocks of a SACk is invalid, the corresponding counter would be updated 3 times. The comment of the `Add counters for discarded SACK blocks`_ patch has additional -explaination: +explanation: .. _Add counters for discarded SACK blocks: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=18f02545a9a16c9a89778b91a162ad16d510bb32 @@ -792,7 +792,7 @@ counters to indicate the ACK is skipped in which scenario. The ACK would only be skipped if the received packet is either a SYN packet or it has no data. -.. _sysctl document: https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt +.. _sysctl document: https://www.kernel.org/doc/Documentation/networking/ip-sysctl.rst * TcpExtTCPACKSkippedSynRecv @@ -829,7 +829,7 @@ PAWS check fails or the received sequence number is out of window. * TcpExtTCPACKSkippedTimeWait -Tha ACK is skipped in Time-Wait status, the reason would be either +The ACK is skipped in Time-Wait status, the reason would be either PAWS check failed or the received sequence number is out of window. * TcpExtTCPACKSkippedChallenge @@ -908,8 +908,8 @@ A TLP probe packet is sent. A packet loss is detected and recovered by TLP. -TCP Fast Open -============= +TCP Fast Open description +========================= TCP Fast Open is a technology which allows data transfer before the 3-way handshake complete. Please refer the `TCP Fast Open wiki`_ for a general description. @@ -984,7 +984,7 @@ TcpExtSyncookiesRecv counter wont be updated. Challenge ACK ============= -For details of challenge ACK, please refer the explaination of +For details of challenge ACK, please refer the explanation of TcpExtTCPACKSkippedChallenge. * TcpExtTCPChallengeACK @@ -1002,7 +1002,7 @@ prune ===== When a socket is under memory pressure, the TCP stack will try to reclaim memory from the receiving queue and out of order queue. One of -the reclaiming method is 'collapse', which means allocate a big sbk, +the reclaiming method is 'collapse', which means allocate a big skb, copy the contiguous skbs to the single big skb, and free these contiguous skbs. @@ -1163,7 +1163,7 @@ The server side nstat output:: IpExtOutOctets 52 0.0 IpExtInNoECTPkts 1 0.0 -Input a string in nc client side again ('world' in our exmaple):: +Input a string in nc client side again ('world' in our example):: nstatuser@nstat-a:~$ nc -v nstat-b 9000 Connection to nstat-b 9000 port [tcp/*] succeeded! @@ -1211,7 +1211,7 @@ replied an ACK. But kernel handled them in different ways. When the TCP window scale option is not used, kernel will try to enable fast path immediately when the connection comes into the established state, but if the TCP window scale option is used, kernel will disable the -fast path at first, and try to enable it after kerenl receives +fast path at first, and try to enable it after kernel receives packets. We could use the 'ss' command to verify whether the window scale option is used. e.g. run below command on either server or client:: @@ -1343,7 +1343,7 @@ Check TcpExtTCPAbortOnMemory on client:: nstatuser@nstat-a:~$ nstat | grep -i abort TcpExtTCPAbortOnMemory 54 0.0 -Check orphane socket count on client:: +Check orphaned socket count on client:: nstatuser@nstat-a:~$ ss -s Total: 131 (kernel 0) @@ -1685,7 +1685,7 @@ Send 3 SYN repeatly to nstat-b:: nstatuser@nstat-a:~$ for i in {1..3}; do sudo tcpreplay -i ens3 /tmp/syn_fixcsum.pcap; done -Check snmp cunter on nstat-b:: +Check snmp counter on nstat-b:: nstatuser@nstat-b:~$ nstat | grep -i skip TcpExtTCPACKSkippedSynRecv 1 0.0 @@ -1770,7 +1770,7 @@ string 'foo' in our example:: Connection from nstat-a 42132 received! foo -On nstat-a, the tcpdump should have caputred the ACK. We should check +On nstat-a, the tcpdump should have captured the ACK. We should check the source port numbers of the two nc clients:: nstatuser@nstat-a:~$ ss -ta '( dport = :9000 || dport = :9001 )' | tee @@ -1778,7 +1778,7 @@ the source port numbers of the two nc clients:: ESTAB 0 0 192.168.122.250:50208 192.168.122.251:9000 ESTAB 0 0 192.168.122.250:42132 192.168.122.251:9001 -Run tcprewrite, change port 9001 to port 9000, chagne port 42132 to +Run tcprewrite, change port 9001 to port 9000, change port 42132 to port 50208:: nstatuser@nstat-a:~$ tcprewrite --infile /tmp/seq_pre.pcap --outfile /tmp/seq.pcap -r 9001:9000 -r 42132:50208 --fixcsum |