Re: hpn_buffer_size

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Fri, Apr 27, 2012 at 08:10:07PM +0200, Petar Bogdanovic wrote:
> Hi,
> 
> I'm trying to figure out, why two nearly identical netbsd-6 hosts have
> troubles using hpn.  They are connected through a 5000 Kb/s link and the
> following (not very scientific) test:
> 
>       dd if=FILE bs=1m count=2 | ssh HOST dd bs=64k of=/dev/null
> 
> yields different results when defaults are in place (430KB/s) and when
> HPNDisabled=yes and/or HPNBufferSize=2048 (590KB/s).

590 KB/sec on a 50000 Kb/sec link is pretty good!

It does strike me that you aren't moving enough data for measurements to
be particularly useful.  The SSH negotiation will have a significant
impact.

Thor