Date: Mon, 14 Nov 2011 16:32:22 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Vincent Hoffman <vince@unsane.co.uk> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: question on netstat statistics. Message-ID: <20111115003222.GA82751@icarus.home.lan> In-Reply-To: <4EC1AAAE.1030007@unsane.co.uk> References: <4EC1AAAE.1030007@unsane.co.uk>
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On Mon, Nov 14, 2011 at 11:56:30PM +0000, Vincent Hoffman wrote:
> I've been trying to work out why my nfs mounts seem to be a little speed
> limited (thats another email though) and though I'd go through the stats
> netstat makes available.
> >From the manpage
>
> netstat -i | -I interface -s [-f protocol_family | -p protocol] [-M
> core]
> [-N system]
> Display per-interface statistics for each network protocol,
> for a
> particular protocol_family, or for a single protocol.
>
>
> I was expecting to be able to see at least some tcp/ip stats per
> interface, but
> [root@banshee ~]# ifconfig -l
> igb0 igb1 lo0 lagg0 lagg0.53 lagg0.52 pflog0 lagg0.66
> [root@banshee ~]# for int in $(ifconfig -l) ; do netstat -I $int -s -f
> inet; done
> [root@banshee ~]#
>
> I can get system wide using netstat -s -f inet and if use netstat -I
> $int -s I get a bunch of ipv6 stats.
> and of course i can get the stats from netstat -I $int too.
>
> Is this expected behaviour? if so maybe the manpage could be made a
> little clearer.
>
> Thanks,
> Vince
>
> ps tested on
> [root@ostracod ~]# uname -a
> FreeBSD ostracod.unsane.co.uk 9.0-RC1 FreeBSD 9.0-RC1 #15 r226879: Fri
> Oct 28 22:25:26 BST 2011
> toor@ostracod.unsane.co.uk:/usr/obj/usr/src/sys/OSTRACOD amd64
> [root@ostracod ~]#
> FreeBSD banshee.namesco.net 8.2-STABLE FreeBSD 8.2-STABLE #5: Wed Nov 2
> 14:53:03 GMT 2011
> toor@banshee.lon.domain.com:/usr/obj/usr/src/sys/BANSHEE amd64
>
> FreeBSD zfstest 9.0-RC2 FreeBSD 9.0-RC2 #0 r227497M: Mon Nov 14 16:14:54
> GMT 2011 toor@zfstest:/usr/obj/usr/src/sys/ZFSTEST amd64
On my system:
netstat -s = returns system-wide statistics for all IP-related bits
netstat -I {iface} = returns network I/O statistics and related bits
associated with that interface
netstat -I {iface} -s = returns nothing (no output)
netstat -I {iface} -f inet = same as "netstat -I {iface}" but only
with IPv4 specific data
netstat -I {iface} -s -f inet = returns nothing (no output)
I think what you're actually looking for is, BTW:
netstat -I em0 -inbd
And if you want real-time I/O rates:
netstat -I em0 -bd 1
Where "1" is the number of seconds between polling iterations.
I don't particularly care what the man page says, I just know what
works. :-)
If you're wanting "netstat -s" output but on a per-interface basis,
those statistics are not tracked per-interface. Maybe netgraph can do
that for you, I do not know.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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