Date: Wed, 4 Nov 2015 13:28:50 -0600 From: Christian Peron <csjp@sqrt.ca> To: elof2@sentor.se Cc: freebsd-net <freebsd-net@FreeBSD.org> Subject: Re: netstat -B "Recv" Message-ID: <04EF5880-800D-4A52-8CD1-DAF87EB6E37A@sqrt.ca> In-Reply-To: <alpine.BSF.2.00.1511041736240.49057@farmermaggot.shire.sentor.se> References: <alpine.BSF.2.00.1511041736240.49057@farmermaggot.shire.sentor.se>
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Your assumptions are correct, recv count is the number of packets which are received by the bpf peer, match count is the number of packets which matched the bpf filter that is active.. this shouldn’t be happening. Are you running netstat during the tcpreplay run or after it completed? Also can you give me more information on what specifically mon0 is? > On Nov 4, 2015, at 10:44 AM, elof2@sentor.se wrote: > > > Hi! > > Question: > What do the Recv column in 'netstat -B' show? > > I thought it was tha amount of packets received, but appaently not so. > > I send 2000000 packets from a tcpreplay machine to a receiving machine. > I do it a few times. > > On the receiver I see: > netstat -in > Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll > ix0 1500 <Link#1> 0c:c4:7a:58:e2:3c 0 0 0 0 0 0 > ix1 1500 <Link#2> 0c:c4:7a:58:e2:3d 6000000 0 0 0 0 0 > > and then > netstat -in > Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll > ix0 1500 <Link#1> 0c:c4:7a:58:e2:3c 0 0 0 0 0 0 > ix1 1500 <Link#2> 0c:c4:7a:58:e2:3d 8000000 0 0 0 0 0 > > So 6000000 has increased to 8000000. Good. > > > However, 'netstat -B' show: > Pid Netif Flags Recv Drop Match Sblen Hblen Command > 25553 mon0 p--s--- 1996862 0 2000000 0 0 tcpdump > > How can the "Recv" be *lower* than "Match"? > 1996862 < 2000000. > > > For every new run (fast and slow) I get the same results, slightly less than 2000000 Recv. > > What am I missing? > > /Elof > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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