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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, gson%gson.org@localhost
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