HPN-SSH

Hi, does anyone have any thought's on this...

http:
//www.psc.edu/networking/projects/hpn-ssh/

basicly it's a patch to openssh to allow tuning of the
internal flow
control buffers.  I'm currently googling for comments from
openssh team...

thanks,
-pete

-- 
~~oO00Oo~~
Peter Wright
petenomadlogic.org
www.nomadlogic.org/~pete
310.869.9459
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On Mon, May 22, 2006 at 10:23:31AM -0700, Peter Wright
wrote:
> Hi, does anyone have any thought's on this...
> 
> http:
//www.psc.edu/networking/projects/hpn-ssh/
> 
> basicly it's a patch to openssh to allow tuning of the
internal flow
> control buffers.  I'm currently googling for comments
from openssh team...

It seems to decrease performance on slow networks:

	http:
//marc.theaimsgroup.com/?m=112884429502318

-Ray-
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> On Mon, May 22, 2006 at 10:23:31AM -0700, Peter Wright
wrote:
>> Hi, does anyone have any thought's on this...
>>
>> http:
//www.psc.edu/networking/projects/hpn-ssh/
>>
>> basicly it's a patch to openssh to allow tuning of
the internal flow
>> control buffers.  I'm currently googling for
comments from openssh
>> team...
>
> It seems to decrease performance on slow networks:
>
> 	http:
//marc.theaimsgroup.com/?m=112884429502318
>
> -Ray-
>


yes it could do that for sure...i am targeting it on 1 and
10 gig-e
ethernet, and am hoping this will help scp performance.  i
guess my
question is, does this introduce any serious compatibility
issues...or
more importantly has the OpenSSH team spotted any problems
with this
patch?

thanks!
-pete


-- 
~~oO00Oo~~
Peter Wright
petenomadlogic.org
www.nomadlogic.org/~pete
310.869.9459
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On Mon, May 22, 2006 at 10:57:22AM -0700, Peter Wright
wrote:
> 
> > On Mon, May 22, 2006 at 10:23:31AM -0700, Peter
Wright wrote:
> >> Hi, does anyone have any thought's on this...
> >>
> >> http:
//www.psc.edu/networking/projects/hpn-ssh/
> >>
> >> basicly it's a patch to openssh to allow
tuning of the internal flow
> >> control buffers.  I'm currently googling for
comments from openssh
> >> team...
> >
> > It seems to decrease performance on slow networks:
> >
> > 	http:
//marc.theaimsgroup.com/?m=112884429502318
> >
> > -Ray-
> >
> 
> 
> yes it could do that for sure...i am targeting it on 1
and 10 gig-e
> ethernet, and am hoping this will help scp performance.
 i guess my
> question is, does this introduce any serious
compatibility issues...or
> more importantly has the OpenSSH team spotted any
problems with this
> patch?

I've only seen reports of slowness for slower networks; I
haven't
seen incompatibility reports, but I don't work on OpenSSH.

Have you tried running with the patch yet?  It might not
improve
performance even for 10 gig Ethernet.

Spam the OpenSSH list for more information.

-Ray-
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On Mon 2006.05.22 at 10:23 -0700, Peter Wright wrote:
> Hi, does anyone have any thought's on this...
> 
> http:
//www.psc.edu/networking/projects/hpn-ssh/
> 
> basicly it's a patch to openssh to allow tuning of the
internal flow
> control buffers.  I'm currently googling for comments
from openssh team...

as an alternative, consider piping over ssh - that tends to
be so much
faster than scp'ing (for me) - however, i have to numbers
to back that
up ;)
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> On Mon 2006.05.22 at 10:23 -0700, Peter Wright wrote:
>> Hi, does anyone have any thought's on this...
>>
>> http:
//www.psc.edu/networking/projects/hpn-ssh/
>>
>> basicly it's a patch to openssh to allow tuning of
the internal flow
>> control buffers.  I'm currently googling for
comments from openssh
>> team...
>
> as an alternative, consider piping over ssh - that
tends to be so much
> faster than scp'ing (for me) - however, i have to
numbers to back that
> up ;)

hmm...i'll have to look into that.  although for this
specific case I do
not think that it will be suitable...although for my
personal cases ;)

-pete

-- 
~~oO00Oo~~
Peter Wright
petenomadlogic.org
www.nomadlogic.org/~pete
310.869.9459
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* Okan Demirmen <okandemirmen.com>
[2006-05-22 14:45:20 -0400]:
> as an alternative, consider piping over ssh - that
tends to be so much
> faster than scp'ing (for me) - however, i have to
numbers to back that
> up ;)

I do this when I need to do a quick and dirty file transfer
and security
is not a concern:

    $ nc -v -l 10000|tar xvf -              # wait for file
to be transferred
    $ tar cf - foo |nc -v example.org 10000 # (sending
machine) transfer file

Thomas

-- 
N.J. Thomas
njtayvali.org
Etiamsi occiderit me, in ipso sperabo
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On Mon, May 22, 2006 at 03:37:24PM -0400, N.J. Thomas wrote:
> * Okan Demirmen <okandemirmen.com>
[2006-05-22 14:45:20 -0400]:
> > as an alternative, consider piping over ssh - that
tends to be so much
> > faster than scp'ing (for me) - however, i have to
numbers to back that
> > up ;)
> 
> I do this when I need to do a quick and dirty file
transfer and security
> is not a concern:
> 
>     $ nc -v -l 10000|tar xvf -              # wait for
file to be transferred
>     $ tar cf - foo |nc -v example.org 10000 # (sending
machine) transfer file

Similarly, I do:

	$ tar czf - . | ssh host 'tar xvzf -'

I remember having trouble when needing to enter a password,
but it
always works when using ssh-agent.

-Ray-
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On Mon, May 22, 2006 at 03:37:24PM -0400, N.J. Thomas wrote:
> * Okan Demirmen <okandemirmen.com>
[2006-05-22 14:45:20 -0400]:
> > as an alternative, consider piping over ssh - that
tends to be so much
> > faster than scp'ing (for me) - however, i have to
numbers to back that
> > up ;)
> 
> I do this when I need to do a quick and dirty file
transfer and security
> is not a concern:
> 
>     $ nc -v -l 10000|tar xvf -              # wait for
file to be transferred
>     $ tar cf - foo |nc -v example.org 10000 # (sending
machine) transfer file

Also, using this method (and even ssh) you may want to read
this:

http:
//www.psc.edu/networking/projects/tcptune/

Basically it explains how to tweak the tcp/ip stack in order
to get a
better performance. 

This is very interesting also:

http:
//www.sun.com/blueprints/0203/817-1657.pdf

David
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Hi Pete, All,

On May 22, 2006, at 1:23 PM, Peter Wright wrote:

> http:
//www.psc.edu/networking/projects/hpn-ssh/
>
> basicly it's a patch to openssh to allow tuning of the
internal flow
> control buffers.  I'm currently googling for comments
from openssh  
> team...

So what do the OpenSSH guys say about HPN-SSH?

Rocket-
.ike


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