| To: | Stephen Hemminger <shemminger@xxxxxxxx> |
|---|---|
| Subject: | Re: [PATCH] fix tcp_default_win_scale. |
| From: | "David S. Miller" <davem@xxxxxxxxxx> |
| Date: | Tue, 6 Jul 2004 13:33:43 -0700 |
| Cc: | jbglaw@xxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxx |
| In-reply-to: | <20040706133146.7ed47c69@dell_ss3.pdx.osdl.net> |
| References: | <32886.63.170.215.71.1088564087.squirrel@www.osdl.org> <20040629222751.392f0a82.davem@redhat.com> <20040630152750.2d01ca51@dell_ss3.pdx.osdl.net> <20040630153049.3ca25b76.davem@redhat.com> <20040701133738.301b9e46@dell_ss3.pdx.osdl.net> <20040701140406.62dfbc2a.davem@redhat.com> <20040702013225.GA24707@conectiva.com.br> <20040706093503.GA8147@outpost.ds9a.nl> <20040706114741.1bf98bbe@dell_ss3.pdx.osdl.net> <20040706185856.GN18841@lug-owl.de> <20040706131731.540dd5fd.davem@redhat.com> <20040706133146.7ed47c69@dell_ss3.pdx.osdl.net> |
| Sender: | netdev-bounce@xxxxxxxxxxx |
On Tue, 6 Jul 2004 13:31:46 -0700 Stephen Hemminger <shemminger@xxxxxxxx> wrote: > The default tcp_rmem[2] is 174760, so we only need a wscale of 2 to represent > that. We were sending 7. It's only going to paper over this problem, because a window scale of 2 still gets edited by the firewalls yet doesn't cause the kind of damage 7 does. Also, using a value of 7 is very safe, because it handles even the tinyest of MTU's in use today (512 byte SLIP connections, for example can still advertise sub-MTU sized chunks in the window). Since a window scale of 7 allows a granularity of 128 octets. |
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