Pulling stalls before 52MB (works via netcat)

[mancha]

On Sat, May 03, 2014 at 08:57:26PM -0700, Grant wrote:
> > I can push fine over ssh but pulling via rsync or scp always stalls
> > at about the same point which must be between 26MB and 52MB.  I can
> > pull via netcat just fine.  I've tried compiling HPN out of the
> > install on both the client and server and I've tried -C on the
> > client with the same result.  I'm on Gentoo.  Any ideas?
> 
> I should have said I'm on openssh-6.6_p1-r1.
> 
> - Grant

Hi.

First off, the HPN patches will not be supported here so I recommend
doing all further debugging on this issue with a pristine OpenSSH.

Now, you mentioned you backed out HPN and the problem remains, so I'll
assume it's not HPN related.

The first thing that comes to mind is you're over-taxing Linux's
selective ack's. Try disabling with:

# echo 0 > /proc/sys/net/ipv4/tcp_sack

If that doesn't help, let's start getting more info, maybe some packet
logs around hang time and client-side and server-side logs.

--mancha

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