Date: Wed, 3 Feb 2010 08:36:16 +1300 From: Jonathan Chen <jonc@chen.org.nz> To: freebsd-stable@freebsd.org Subject: 8-STABLE outgoing scp stalling frequently. Message-ID: <20100202193616.GA16953@osiris.chen.org.nz>
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Hi,
I've noticed that on a recent 8-STABLE/amd64, scp(1) appears to be
stalling very frequently. This is the output from a "scp -v -v"
of a 300Mb file from a local to a remote within an internal network:
[.. authentication negotiation ...]
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 131072
debug2: channel_input_status_confirm: type 99 id 0
debug2: exec request accepted on channel 0
Sending file modes: C0700 367085370 file1
file1 0% 192KB 140.0KB/s 42:39 ETAdebug2: channel 0: rcvd adjust 65593
file1 0% 256KB 78.2KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 336KB 41.6KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 416KB 26.9KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 496KB 17.1KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 576KB 12.4KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 656KB 11.3KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 736KB 9.7KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 816KB 9.9KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 896KB 9.0KB/s - stalled -debug2: channel 0: rcvd adjust 81920
file1 0% 976KB 9.5KB/s - stalled -debug2: channel 0: rcvd adjust 81920
/etc/ssh/ssh_config is untouched. Oddly enough a scp of a remote file
to the local machine is blindingly fast.
Does anyone know what's happening here? Any tips on how to track down
what the problem is? The network config appears to be fine - fetch(1) will
have downloads speeds of up to 300KB/s.
Cheers.
--
Jonathan Chen <jonc@chen.org.nz>
----------------------------------------------------------------------
"With sufficient thrust, pigs fly just fine. However, this is not necessarily
a good idea. It is hard to be sure where they are going to land, and it
could be dangerous sitting under them as they fly overhead." -- RFC 1925
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