Date: Thu, 21 Jul 2011 10:10:11 -0400 From: "Michael W. Lucas" <mwlucas@blackhelicopters.org> To: Eduardo Morras <nec556@retena.com> Cc: questions@freebsd.org Subject: Re: em0 NIC slow on 8.2-p1 amd64? Message-ID: <20110721141011.GB47190@bewilderbeast.blackhelicopters.org> In-Reply-To: <4D301C9702145855@> References: <20110720160432.GA41775@bewilderbeast.blackhelicopters.org> <4D6348DC01B1E406@> <20110720191640.GA42821@bewilderbeast.blackhelicopters.org> <4D301C9702145855@>
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On Wed, Jul 20, 2011 at 09:32:27PM +0200, Eduardo Morras wrote: > At 21:16 20/07/2011, Michael W. Lucas wrote: > > >It's at gigabit: > > > >em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > > > >options=219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC> > > ether 00:15:17:31:c8:fe > > inet xxxxxxx > > media: Ethernet autoselect (1000baseT <full-duplex>) > > status: active > > All seems to be ok, try a netstat -I em0 -d (it's a capital 'i') to > get statistics. If too much packets are dropped recheck cables. > > Other options: > > a) 30 MB/s looks very strange, do you have pf or similar with a filter rule? > b) Have you checked your disk i/o performance? > c) If you generate the data dinamically, may be your producer app is > the problem. > > About the em specific problem under 8.2 you cite, others can guide > better than me. > > HTH No obvious errors on netstat: netstat -I em0 -d Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll Drop em0 1500 <Link#1> 00:15:17:31:c8:fe 11709782 0 0 6855755 0 0 0 em0 1500 139.171.199.0 data5-vm 9546994 - - 7584135 - - - PF is running, but disabling it makes no difference in throughput. Disk is mostly idle... not saying it can't be disk, mind you, but local disk-to-disk copies go much more quickly. I'm testing by copying an ISO. And as far as me knowing "many more things," well, if I knew what the problem was, I wouldn't be begging for help like any other user. :-) Thanks, ==ml -- Michael W. Lucas http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/ Latest book: Network Flow Analysis http://www.networkflowanalysis.com/ mwlucas@BlackHelicopters.org, Twitter @mwlauthor
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