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Re: Why is my gigabit ethernet so slow?

On Fri, Jan 29, 2010 at 03:57:51PM +0200, Andreas Gustafsson wrote:
> > In theory, one should never have to disable it explicitly; its use
> > is negotiated.  But there's no particular harm to using if if both
> > sides support it; it's just that it's not likely to help much.
> In my experience, on NetBSD, SACK does cause harm, by breaking
> TCP Fast Retransmit.  See the discussion on tech-net in 2008:

Are you using hardware checksum offload on that "re0" interface?
If you do please try to disable it and reenable SACK.

        Kind regards

Matthias Scheler                        

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