Date: Sat, 02 May 2009 22:16:04 +1000 From: Lawrence Stewart <lstewart@freebsd.org> To: Kevin Day <toasty@dragondata.com> Cc: freebsd-net@freebsd.org Subject: Re: Slow local TCP transfers on -CURRENT Message-ID: <49FC3984.8050609@freebsd.org> In-Reply-To: <00C19FCC-837A-44B8-A0C9-C56E3D02F8EF@dragondata.com> References: <00C19FCC-837A-44B8-A0C9-C56E3D02F8EF@dragondata.com>
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Kevin Day wrote: > > I've been seeing this for a few months now on -CURRENT. TCP transfers to > local IP addresses (but not 127.0.0.1) are incredibly slow. > > Transfer from localhost: > > # scp "root@127.0.0.1:/boot/kernel/kernel" . > kernel > 100% 11MB 11.1MB/s 00:00 > > Appropriately fast. > > > Transfer from an IP on a local interface: > > # scp "root@216.14.96.4:/boot/kernel/kernel" . > kernel > 0% 16KB 13.0KB/s 14:37 ETA > > > The routes seem normal: > > > # route get 127.0.0.1 > route to: localhost > destination: localhost > interface: lo0 > flags: <UP,HOST,DONE,LOCAL> > recvpipe sendpipe ssthresh rtt,msec mtu weight expire > 0 0 0 0 16384 1 0 > > # route -n get 216.14.96.4 > route to: 216.14.96.4 > destination: 216.14.96.0 > mask: 255.255.255.128 > interface: nfe0 > flags: <UP,DONE> > recvpipe sendpipe ssthresh rtt,msec mtu weight expire > 0 0 0 0 1500 1 0 > > > nfe0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4> > ether 00:30:48:c6:dd:9c > inet 216.14.96.4 netmask 0xffffff80 broadcast 216.14.96.127 > > Takes 10-60 minutes to copy, stalling frequently during the transfer. > It's not limited to just scp either, all TCP transfers seem to stall > this way. > > > > I don't believe I'm doing anything unusual, has anyone seen anything > like this? Known fallout from the ARPv2 work I believe. As a workaround until it gets fixed: route add -host (if-ip) -iface lo0 (note I haven't tested this myself) (see the Jan 2009 freebsd-net@ thread "Bacula: VERY SLOW on SAME host" for some details). Cheers, Lawrence
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