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Re: Why is my gigabit ethernet so slow?

Steven Bellovin wrote:
> > I wonder if it would make sense for the kernel to keep a list of
> > networks to disable SACK on, or look at TTL values to determine that.
> 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:

Andreas Gustafsson,

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