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On Tue, Mar 15, 2005 at 06:02:45PM +0900, Noritoshi Demizu wrote:
> > > By the way, I think TCP_SACK_MAX (declared in tcp_var.h) should be 4.
> >
> > Yes, but I was working under the assumption that if a flow is SACK capa=
ble,
> > it will more than likely also be using the timestamp option.  It's triv=
ial
> > enough to checdk for it, I suppose.
>=20
> In my experience, Windows XP does not use the TCP Timestamps option by
> default, while it uses the SACK Permitted option.  That says, in a case
> where IE6 on a Windows XP machine accesses to Apache on a NetBSD
> machine, the TCP connection uses SACK while it does not use Timestamps.
>=20
> Although there would be only limited situations where IE6 would send
> large data to a web server (e.g., uploading large pictures), I think
> it is better to send SACK blocks as much as possible for such case.

(Pulls out ethereal and checks the behavior on $randomWindowsBox)

Oh wow.  That's kind of weird.  Ok, it's trivial enough to change, I'll do
it when I have a few moments.  (Working on making the SACK retransmission c=
ode
a bit smarter)

Thanks!

--=20
Kentaro A. Kurahone
SIGUSR1 Research and Development

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