Author: rscheff
Date: Wed Jun 24 13:42:42 2020
New Revision: 362577
URL: https://svnweb.freebsd.org/changeset/base/362577
Log:
TCP: make after-idle work for transactional sessions.
The use of t_rcvtime as proxy for the last transmission
fails for transactional IO, where the client request
Author: rscheff
Date: Wed Jun 24 13:52:53 2020
New Revision: 362580
URL: https://svnweb.freebsd.org/changeset/base/362580
Log:
TCP: fix cubic RTO reaction.
Proper TCP Cubic operation requires the knowledge
of the maximum congestion window prior to the
last congestion event.
This re
Author: rscheff
Date: Tue Jul 7 12:10:59 2020
New Revision: 362988
URL: https://svnweb.freebsd.org/changeset/base/362988
Log:
Fix KASSERT during tcp_newtcpcb when low on memory
While testing with system default cc set to cubic, and
running a memory exhaustion validation, FreeBSD panics f
Author: rscheff
Date: Mon Jul 20 23:47:27 2020
New Revision: 363380
URL: https://svnweb.freebsd.org/changeset/base/363380
Log:
Add MODULE_VERSION to TCP loadable congestion control modules.
Without versioning information, using preexisting loader /
linker code is not easily possible when
Author: rscheff
Date: Tue Jul 21 16:21:52 2020
New Revision: 363397
URL: https://svnweb.freebsd.org/changeset/base/363397
Log:
Fix style and comment around concave/convex regions in TCP cubic.
In cubic, the concave region is when snd_cwnd starts growing slower
towards max_cwnd (cwnd at th
Author: rscheff
Date: Thu Aug 13 16:30:09 2020
New Revision: 364195
URL: https://svnweb.freebsd.org/changeset/base/364195
Log:
Improve SACK support code for RFC6675 and PRR
Adding proper accounting of sacked_bytes and (per-ACK)
delivered data to the SACK scoreboard. This will
allow more
Author: rscheff
Date: Thu Aug 13 16:38:51 2020
New Revision: 364196
URL: https://svnweb.freebsd.org/changeset/base/364196
Log:
TCP Cubic: After leaving slowstart fix unintended cwnd jump.
Initializing K to zero in D23655 introduced a miscalculation,
where cwnd would suddenly jump to cwnd_
Author: rscheff
Date: Thu Aug 13 16:45:55 2020
New Revision: 364197
URL: https://svnweb.freebsd.org/changeset/base/364197
Log:
TCP Cubic: Have Fast Convergence Heuristic work for ECN, and align concave
region
The Cubic concave region was not aligned nicely for the very first exit from
sl
Author: rscheff
Date: Tue Aug 18 19:34:31 2020
New Revision: 364354
URL: https://svnweb.freebsd.org/changeset/base/364354
Log:
TCP Cubic: recalculate cwnd for every ACK.
Since cubic calculates cwnd based on absolute
time, retaining RFC3465 (ABC) once-per-window updates
can lead to drama
Author: rscheff
Date: Sat Oct 24 16:09:18 2020
New Revision: 367007
URL: https://svnweb.freebsd.org/changeset/base/367007
Log:
tcp: move cwnd and ssthresh updates into cc modules
This will pave the way of setting ssthresh differently in TCP CUBIC, according
to RFC8312 section 4.7.
No
Author: rscheff
Date: Sat Oct 24 16:11:46 2020
New Revision: 367008
URL: https://svnweb.freebsd.org/changeset/base/367008
Log:
TCP Cubic: improve reaction to (and rollback from) RTO
1. fix compliancy issue of CUBIC RTO handling according to RFC8312 section 4.7
2. add CUBIC CC_RTO_ERR hand
Author: rscheff
Date: Sat Oct 24 21:01:18 2020
New Revision: 367021
URL: https://svnweb.freebsd.org/changeset/base/367021
Log:
Make use of IP_VLAN_PCP setsockopt in ping and ping6.
In order to validate the proper marking and use of a different
ethernet priority class, add the new session-
Author: rscheff
Date: Sat Oct 24 21:07:13 2020
New Revision: 367023
URL: https://svnweb.freebsd.org/changeset/base/367023
Log:
Add network QoS support for PCP to iscsi initiator.
Make the Ethernet PCP codepoint configurable
for L2 local traffic, to allow lower latency for
iSCSI block IO
Author: rscheff
Date: Sat Oct 24 21:10:53 2020
New Revision: 367024
URL: https://svnweb.freebsd.org/changeset/base/367024
Log:
Add network QoS support for PCP to iscsi target.
Mak the Ethernet PCP codepoint configurable
for L2 local traffic, to allow lower latency for
iSCSI block IO. Th
Author: rscheff
Date: Sun Nov 8 18:47:05 2020
New Revision: 367492
URL: https://svnweb.freebsd.org/changeset/base/367492
Log:
Prevent premature SACK block transmission during loss recovery
Under specific conditions, a window update can be sent with
outdated SACK information. Some clients
Author: rscheff
Date: Fri Dec 4 11:29:27 2020
New Revision: 368327
URL: https://svnweb.freebsd.org/changeset/base/368327
Log:
Add TCP feature Proportional Rate Reduction (PRR) - RFC6937
PRR improves loss recovery and avoids RTOs in a wide range
of scenarios (ACK thinning) over regular SA
Author: rscheff
Date: Thu Apr 16 15:59:23 2020
New Revision: 360010
URL: https://svnweb.freebsd.org/changeset/base/360010
Log:
Reduce default TCP delayed ACK timeout to 40ms.
Reviewed by: kbowling, tuexen
Approved by: tuexen (mentor)
MFC after:2 weeks
Sponsored by: NetApp, Inc.
Author: rscheff
Date: Tue Apr 21 13:05:44 2020
New Revision: 360143
URL: https://svnweb.freebsd.org/changeset/base/360143
Log:
Correctly set up the initial TCP congestion window
in all cases, by adjust snd_una right after the
connection initialization, to include the one byte
in sequence s
Author: rscheff
Date: Wed Apr 22 00:16:42 2020
New Revision: 360180
URL: https://svnweb.freebsd.org/changeset/base/360180
Log:
revert rS360143 - Correctly set up initial cwnd
due to syzkaller panics found
Reported by: tuexen
Approved by: tuexen (mentor)
Sponsored by: NetApp, Inc.
Author: rscheff
Date: Wed Apr 29 21:48:52 2020
New Revision: 360477
URL: https://svnweb.freebsd.org/changeset/base/360477
Log:
Correctly set up the initial TCP congestion window in all cases,
by not including the SYN bit sequence space in cwnd related calculations.
Snd_und is adjusted explic
Author: rscheff
Date: Wed Apr 29 22:01:33 2020
New Revision: 360479
URL: https://svnweb.freebsd.org/changeset/base/360479
Log:
Prevent premature shrinking of the scaled receive window
which can cause a TCP client to use invalid or stale TCP sequence numbers for
ACK packets.
Packets with
Author: rscheff
Date: Thu Apr 30 11:11:28 2020
New Revision: 360491
URL: https://svnweb.freebsd.org/changeset/base/360491
Log:
Introduce a lower bound of 2 MSS to TCP Cubic.
Running TCP Cubic together with ECN could end up reducing cwnd down to 1
byte, if the
receiver continously sets th
Author: rscheff
Date: Thu May 21 21:15:25 2020
New Revision: 361345
URL: https://svnweb.freebsd.org/changeset/base/361345
Log:
Handle ECN handshake in simultaneous open
While testing simultaneous open TCP with ECN, found that
negotiation fails to arrive at the expected final state.
R
Author: rscheff
Date: Thu May 21 21:26:21 2020
New Revision: 361346
URL: https://svnweb.freebsd.org/changeset/base/361346
Log:
Retain only mutually supported TCP options after simultaneous SYN
When receiving a parallel SYN in SYN-SENT state, remove all the
options only we supported locall
Author: rscheff
Date: Thu May 21 21:33:15 2020
New Revision: 361347
URL: https://svnweb.freebsd.org/changeset/base/361347
Log:
With RFC3168 ECN, CWR SHOULD only be sent with new data
Overly conservative data receivers may ignore the CWR flag
on other packets, and keep ECE latched. This ca
Author: rscheff
Date: Thu May 21 21:42:49 2020
New Revision: 361348
URL: https://svnweb.freebsd.org/changeset/base/361348
Log:
DCTCP: update alpha only once after loss recovery.
In mixed ECN marking and loss scenarios it was found, that
the alpha value of DCTCP is updated two times. The s
Author: rscheff
Date: Thu Jun 4 20:47:11 2020
New Revision: 361806
URL: https://svnweb.freebsd.org/changeset/base/361806
Log:
Add O_DIRECT flag to DD for cache bypass
FreeBSD DD utility has not had support for the O_DIRECT flag, which
is useful to bypass local caching, e.g. for unconditi
Author: rscheff
Date: Tue Jun 9 21:07:58 2020
New Revision: 361987
URL: https://svnweb.freebsd.org/changeset/base/361987
Log:
Prevent TCP Cubic to abruptly increase cwnd after slow-start
Introducing flags to track the initial Wmax dragging and exit
from slow-start in TCP Cubic. This prev
Author: rscheff
Date: Wed Jun 10 07:32:02 2020
New Revision: 362006
URL: https://svnweb.freebsd.org/changeset/base/362006
Log:
Prevent TCP Cubic to abruptly increase cwnd after app-limited
Cubic calculates the new cwnd based on absolute time
elapsed since the start of an epoch. A cubic ep
el="Ravi Pokala\nrpok...@freebsd.org\n2015/11/19"]
rrs [label="Randall R Stewart\n...@freebsd.org\n2007/02/08"]
+rscheff [label="Richard Scheffenegger\nrsch...@freebsd.org\n2020/04/06"]
rse [label="Ralf S. Engelschall\n...@freebsd.org\n1997/07/31"]
rstone [
Author: rscheff
Date: Thu Sep 10 00:46:38 2020
New Revision: 365546
URL: https://svnweb.freebsd.org/changeset/base/365546
Log:
cc_mod: remove unused CCF_DELACK definition
During the DCTCP improvements, use of CCF_DELACK was
removed. This change is just to rename the unused flag
bit to p
Author: rscheff
Date: Thu Sep 10 00:50:18 2020
New Revision: 365547
URL: https://svnweb.freebsd.org/changeset/base/365547
Log:
Add -z "TOS" option to ping6, to test DSCP/ECN values
ping has the option to add the (deprecated) TOS byte
using the -z option. Adding the same option, with the
Author: rscheff
Date: Fri Sep 25 10:23:14 2020
New Revision: 366149
URL: https://svnweb.freebsd.org/changeset/base/366149
Log:
TCP newreno: improve after_idle ssthresh
Adjust ssthresh in after_idle to the maximum of
the prior ssthresh, or 3/4 of the prior cwnd. See
RFC2861 section 2 for
Author: rscheff
Date: Fri Sep 25 10:38:19 2020
New Revision: 366150
URL: https://svnweb.freebsd.org/changeset/base/366150
Log:
TCP: send full initial window when timestamps are in use
The fastpath in tcp_output tries to send out
full segments, and avoid sending partial segments by
compa
Author: rscheff
Date: Sun Sep 27 21:43:19 2020
New Revision: 366206
URL: https://svnweb.freebsd.org/changeset/base/366206
Log:
Add DSCP support for network QoS to iscsi target.
In order to prioritize iSCSI traffic across a network,
DSCP can be used. In order not to rely on "ipfw setdscp"
Author: rscheff
Date: Fri Oct 9 10:07:41 2020
New Revision: 366566
URL: https://svnweb.freebsd.org/changeset/base/366566
Log:
Extend netstat to display TCP stack and detailed congestion state
Adding the "-c" option used to show detailed per-connection
congestion control state for TCP ses
Author: rscheff
Date: Fri Oct 9 10:55:19 2020
New Revision: 366567
URL: https://svnweb.freebsd.org/changeset/base/366567
Log:
Extend netstat to display TCP stack and detailed congestion state (2)
Extend netstat to display TCP stack and detailed congestion state
Adding the "-c" option
Author: rscheff
Date: Fri Oct 9 12:06:43 2020
New Revision: 366569
URL: https://svnweb.freebsd.org/changeset/base/366569
Log:
Add IP(V6)_VLAN_PCP to set 802.1 priority per-flow.
This adds a new IP_PROTO / IPV6_PROTO setsockopt (getsockopt)
option IP(V6)_VLAN_PCP, which can be set to -1 (
Author: rscheff
Date: Fri Oct 9 12:44:56 2020
New Revision: 366570
URL: https://svnweb.freebsd.org/changeset/base/366570
Log:
Stop sending tiny new data segments during SACK recovery
Consider the currently in-use TCP options when
calculating the amount of new data to be injected during
Author: rscheff
Date: Fri Oct 9 14:33:09 2020
New Revision: 366573
URL: https://svnweb.freebsd.org/changeset/base/366573
Log:
Add DSCP support for network QoS to iscsi initiator.
Allow the DSCP codepoint also to be configurable
for the traffic in the direction from the initiator
to the
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