Bug 140597 - [tcp] [patch] implement Lost Retransmission Detection
Summary: [tcp] [patch] implement Lost Retransmission Detection
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: Unspecified
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-net (Nobody)
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-11-16 07:20 UTC by Richard Scheffenegger
Modified: 2021-01-10 21:10 UTC (History)
2 users (show)

See Also:


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Description Richard Scheffenegger 2009-11-16 07:20:00 UTC
SACK TCP in FreeBSD does not do Lost Retransmission Detection.

Unlike linux, that functionality is not implemented, leading to a RTO when a single segment is lost twice. This reduces Goodput considerably during phases 
of higher congestion.

See http://ubinet.yonsei.ac.kr/v2/publication/hpmn_papaers/ij/29.pdf
And http://projects.itri.aist.go.jp/gnet/pfldnet08kodama.ppt

Fix: 

Simple fix is rather easy (doesn't work perfectly under all circumstances,
but doesn't need new state variable and runs in constant time):

When sending the last segment in a sackhole, store snd.max in rxmit.
During SACK Ack processing, check the value of rxmit from the lowest 
hole against snd.fack; if snd.fack <= rxmit of that hole, set rxmit to 
start, and sackhint.nexthole == sackhole[0]. 

Care must be taken during hole-splitting (if rxmit > end of lower hole, set
rxmit to snd.max), and all checks of sackhole[].rxmit need to deal with
the signal rxmit > end.

See http://www.ietf.org/mail-archive/web/tcpm/current/msg05003.html ff.
How-To-Repeat: Drop the same segment of a TCP Stram twice, when cwnd is open enough (3+ segments).
Comment 1 Mark Linimon freebsd_committer freebsd_triage 2009-11-16 08:39:23 UTC
State Changed
From-To: open->suspended

Mark suspended awaiting patches. 


Comment 2 Mark Linimon freebsd_committer freebsd_triage 2009-11-16 08:39:23 UTC
Responsible Changed
From-To: freebsd-bugs->freebsd-net

Over to maintainer(s).
Comment 3 Richard Scheffenegger 2010-04-02 18:48:04 UTC
As discussed earlier, here is a simple fix.

Caveat: Doesn't work at the end of a session or when cwnd is very small
(<4 segments). Also, during heavy reordering, some spurious
re-retransmissions might occur (but that would only affect very few
re-retransmitted segments, as holes would still close with each
additional received SACK, reducing the chance of spurious
re-transmissions).=20

Benefit: during LAN burst drop events, TCP will not revert to
retransmission timeouts in order to recover. In a LAN, the RTO is
typically many orders of magnitude larger than the RTT. Not relying on
RTO whenever possible can help keep throughput up..


Simple Patch:


------------------------------------------
diff -u netinet.orig/tcp_output.c netinet/tcp_output.c
--- netinet.orig/tcp_output.c   2009-10-25 02:10:29.000000000 +0100
+++ netinet/tcp_output.c        2010-04-02 16:55:14.000000000 +0200
@@ -953,6 +953,10 @@
        } else {
                th->th_seq =3D htonl(p->rxmit);
                p->rxmit +=3D len;
+               /* lost again detection */
+               if (SEQ_GEQ(p->rxmit, p->end)) {
+                       p->rxmit =3D tp->snd_nxt;
+               }
                tp->sackhint.sack_bytes_rexmit +=3D len;
        }
        th->th_ack =3D htonl(tp->rcv_nxt);
diff -u netinet.orig/tcp_sack.c netinet/tcp_sack.c
--- netinet.orig/tcp_sack.c     2009-10-25 02:10:29.000000000 +0100
+++ netinet/tcp_sack.c  2010-04-02 16:46:42.000000000 +0200
@@ -460,6 +460,13 @@
        /* We must have at least one SACK hole in scoreboard. */
        KASSERT(!TAILQ_EMPTY(&tp->snd_holes),
            ("SACK scoreboard must not be empty"));
+       /* lost again - then restart */
+       if ((temp =3D TAILQ_FIRST(&tp->snd_holes)) !=3D NULL) {
+               if (SEQ_GT(tp->snd_fack, temp->rxmit)) {
+                       temp->rxmit =3D temp->start;
+                       tp->sackhint.nexthole =3D temp;
+               }
+       }
        cur =3D TAILQ_LAST(&tp->snd_holes, sackhole_head); /* Last SACK
hole. */
        /*
         * Since the incoming sack blocks are sorted, we can process
them
@@ -508,7 +515,9 @@
                        if (SEQ_GEQ(sblkp->end, cur->end)) {
                                /* Move end of hole backward. */
                                cur->end =3D sblkp->start;
-                               cur->rxmit =3D SEQ_MIN(cur->rxmit,
cur->end);
+                               if (SEQ_GEQ(cur->rxmit, cur->end)) {
+                                       cur->rxmit =3D tp->snd_nxt;
+                               }
                        } else {
                                /*
                                 * ACKs some data in middle of a hole;
need
@@ -524,8 +533,9 @@
                                                    - temp->start);
                                        }
                                        cur->end =3D sblkp->start;
-                                       cur->rxmit =3D =
SEQ_MIN(cur->rxmit,
-                                           cur->end);
+                                       if (SEQ_GEQ(cur->rxmit,
cur->end)) {
+                                               cur->rxmit =3D
tp->snd_nxt;
+                                       }
                                }
                        }
                }
Comment 4 Mark Linimon freebsd_committer freebsd_triage 2010-04-03 18:54:12 UTC
State Changed
From-To: suspended->open

New patch received.
Comment 5 Mark Linimon 2010-04-05 05:09:23 UTC
uuencoded version of patch received in private email (should fix the
problems with quoted-printable):

----- Forwarded message from "Scheffenegger, Richard" <rs@netapp.com> -----

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"`0``
`
end

----- End forwarded message -----
Comment 6 Richard Scheffenegger 2010-04-21 02:16:01 UTC
I found a small oversight (bug) in my earlier simple fix. If we had sent
out multiple holes already, all of which get (partially) lost in the
retransmission again, the original simple patch would only work for the
very first hole. So, subsequent holes would not get re-sent, unless
another ACK (SACK) would be received - however, seeing more SACKs
becomes less likely the more loss is expirienced.

This is a updated patch diff, which accounts for that case as well - but
at the cost of O(n) time, instead of O(c).

(Just check all holes from the hint backwards to the head, if any
already fully resent hole needs to be reset, instead of only the first
one - which might go away during subsequent processing in the original
patch).



diff -u netinet.orig/tcp_output.c netinet/tcp_output.c
--- netinet.orig/tcp_output.c   2009-10-25 02:10:29.000000000 +0100
+++ netinet/tcp_output.c        2010-04-02 16:55:14.000000000 +0200
@@ -953,6 +953,10 @@
        } else {
                th->th_seq =3D htonl(p->rxmit);
                p->rxmit +=3D len;
+               /* lost again detection */
+               if (SEQ_GEQ(p->rxmit, p->end)) {
+                       p->rxmit =3D tp->snd_nxt;
+               }
                tp->sackhint.sack_bytes_rexmit +=3D len;
        }
        th->th_ack =3D htonl(tp->rcv_nxt);
diff -u netinet.orig/tcp_sack.c netinet.simple_mod/tcp_sack.c
--- netinet.orig/tcp_sack.c     2009-10-25 02:10:29.000000000 +0100
+++ netinet/tcp_sack.c          2010-04-21 00:48:23.000000000 +0200
@@ -508,7 +508,9 @@
                        if (SEQ_GEQ(sblkp->end, cur->end)) {
                                /* Move end of hole backward. */
                                cur->end =3D sblkp->start;
-                               cur->rxmit =3D SEQ_MIN(cur->rxmit,
cur->end);
+                               if (SEQ_GEQ(cur->rxmit, cur->end)) {
+                                       cur->rxmit =3D tp->snd_nxt;
+                               }
                        } else {
                                /*
                                 * ACKs some data in middle of a hole;
need
@@ -524,8 +526,9 @@
                                                    - temp->start);
                                        }
                                        cur->end =3D sblkp->start;
-                                       cur->rxmit =3D =
SEQ_MIN(cur->rxmit,
-                                           cur->end);
+                                       if (SEQ_GEQ(cur->rxmit,
cur->end)) {
+                                               cur->rxmit =3D
tp->snd_nxt;
+                                       }
                                }
                        }
                }
@@ -540,6 +543,15 @@
                else
                        sblkp--;
        }
+       /* retransmission lost again - then restart */
+       if ((temp =3D tp->sackhint.nexthole) !=3D NULL) {
+               do {
+                       if (SEQ_GT(tp->snd_fack, temp->rxmit)) {
+                               temp->rxmit =3D temp->start;
+                               tp->sackhint.nexthole =3D temp;
+                       }
+               } while ((temp =3D TAILQ_PREV(temp, sackhole_head,
scblink)) !=3D NULL);
+       }
 }

 /*




Richard Scheffenegger

=20
Comment 7 Andre Oppermann freebsd_committer 2010-08-10 23:15:15 UTC
Responsible Changed
From-To: freebsd-net->andre

Take over.
Comment 8 Hiren Panchasara freebsd_committer 2017-01-05 22:30:21 UTC
This might still be true but I am not quite sure. i.e. dropping the same segment twice resulting in RTO. If thats still the case, it'd be nice to resurrect this patch.
Comment 9 Eitan Adler freebsd_committer freebsd_triage 2018-05-28 19:41:10 UTC
batch change:

For bugs that match the following
-  Status Is In progress 
AND
- Untouched since 2018-01-01.
AND
- Affects Base System OR Documentation

DO:

Reset to open status.


Note:
I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.