Date: Sat, 22 Jun 2013 10:28:17 +0200 From: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: netstat -i not accurate on -stable ? Message-ID: <CA%2Bq%2BTcq=GWXGTxkLgBni_QZth_YcS0q2NTZVsROC_Jb=EAyciQ@mail.gmail.com>
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Hi all,
I was testing my pthread-netblbast (PR bin/179085) when I found a
problem with netstat counters (tested on 9-stable r252056).
netreceive (src/toots/tools/netrate) display this output:
542025 pps 43.362 Mbps - 271554 pkts in 0.500998393 ns
541562 pps 43.325 Mbps - 271323 pkts in 0.501000754 ns
541517 pps 43.321 Mbps - 271300 pkts in 0.500999700 ns
540487 pps 43.239 Mbps - 270784 pkts in 0.500999904 ns
541541 pps 43.323 Mbps - 271312 pkts in 0.500999621 ns
540624 pps 43.250 Mbps - 270853 pkts in 0.501000361 ns
541403 pps 43.312 Mbps - 271243 pkts in 0.500999669 ns
541079 pps 43.286 Mbps - 271081 pkts in 0.501000212 ns
540887 pps 43.271 Mbps - 270985 pkts in 0.501000258 ns
541796 pps 43.344 Mbps - 271440 pkts in 0.500999971 ns
541056 pps 43.284 Mbps - 271069 pkts in 0.500999719 ns
541224 pps 43.298 Mbps - 271155 pkts in 0.501002856 ns
541120 pps 43.290 Mbps - 271100 pkts in 0.500997659 ns
But in the same time a "netstat -ihw 1" display this output:
input (Total) output
packets errs idrops bytes packets errs bytes colls
521k 508k 0 30M 3 0 562 0
521k 511k 0 30M 3 0 514 0
521k 526k 0 30M 3 0 514 0
521k 538k 0 30M 4 0 616 0
521k 495k 0 30M 3 0 514 0
521k 502k 0 30M 3 0 514 0
521k 531k 0 30M 3 0 514 0
521k 502k 0 30M 3 0 514 0
521k 504k 0 30M 3 0 514 0
521k 495k 0 30M 3 0 514 0
521k 498k 0 30M 3 0 514 0
521k 516k 0 30M 3 0 514 0
There are about 20Kpps difference between them.
Regards,
Olivier
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