FW: pmtu patch
Qing Li
qingli at speakeasy.net
Fri Apr 29 19:30:40 PDT 2005
-----Original Message-----
From: Qing Li [mailto:qingli at FreeBSD.org]
Sent: Thursday, April 28, 2005 5:36 PM
To: andre at freebsd.org
Cc: qingli at freebsd.org
Subject: pmtu patch
Hi Andre,
I was thinking whether we could add another variable
in "hc_metrics" called "u_long rmx_mtu_lastupdate" and
perhaps a new function called "tcp_hc_getmtu_update"
When we get the ICMP PRC_MSGSIZE notification, we do
if (((time_second() - tcp_hc_getmtu_update(&inc)) < PMTU_MIN)
do_nothing;
else {
...
}
If there is no suggested mtu value, instead of immediately
falling back to the default, or rely on the original
packet fragment, can we just use the mtu value in the
host cache as the basis for the next try as in:
else {
<set new value for rmx_mtu_lastupdate>
mtu = ip_next_mtu(tcp_hc_getmtu(&inc), 1);
}
-- Qing
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