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Re: Why is my gigabit ethernet so slow? (Andreas Gustafsson) writes:

> 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:

So probably our SACK implementation should get fixed, unless this is
really intrinsic in the spec (which seems hard to believe).

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