Re: Why is my gigabit ethernet so slow?

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

On Wed, Jan 27, 2010 at 12:31:36PM +0700, Robert Elz wrote:
>     Date:        Tue, 26 Jan 2010 23:59:19 -0500
>     From:        Thor Lancelot Simon <tls%panix.com@localhost>
>     Message-ID:  <20100127045919.GA15910%panix.com@localhost>
> 
>   | Why the automatic socket buffer sizing code isn't bringing the socket
>   | buffer size and thus the window size up to 128K by itself over the course
>   | of a 10GB test is not obvious to me.
> 
> Is that still used if the application explicitly sets a buffer size?
> 
> And, if the -b option is not used, does ttcp just use whatever is the
> default socket buffer size, or does it have its own default (perhaps 32KB)
> that it explicitly sets?

I just checked -- it uses the default.  It only calls setsockopt if the
user supplies a size with -b on the command line.

Thor