netdev - Re: [PATCH] tcp: Increase the initial congestion window to 10.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Sat, 5 Feb 2011 14:58:42 +0100
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	Leandro Melo de Sales <leandroal@...il.com>
Cc:	netdev@...r.kernel.org, dccp@...r.kernel.org
Subject: Re: [PATCH] tcp: Increase the initial congestion window to 10.

Leandro,
| >  include/net/tcp.h      |   12 +++---------
| >  net/dccp/ccids/ccid2.c |    9 +++++++++
|
David's change only affects CCID-2, CCID-3/4 remain unaffected,
they use rfc3390_initial_rate() (which does almost the same).

|     I don't think this change will make sense for DCCP, once IW10 is
| for the cases of short-lived flows. DCCP is used on scenarios for
| multimedia flows, which are, in general, long-lived flows. So, IMO the
| way how we calculate IW for DCCP is appropriate, at least considering
| a quick answer. 
I agree with you, and also vote to eventually bring CCID-2 on a par with
the state of art in TCP. Before we can do this, the CCID-2 implementation
needs some work (as per separate thread with Samuel Jero).

| In fact, nowadays we need better congestion control algorithms for DCCP,
| and in this sense we are working on adapt TCP Cubic for DCCP as a CCID,
| and also we started some work to make DCCP support TCP pluggable
| mechanism , which will allow us to use TCP congestion control
| algorithms in DCCP.
This is very good news and am very much looking forward to the new approach.

| DCCP should calculate its IW as specified in RFC3390 rather than set
| it to IW10. For the moment, I understand that for DCCP, we have to 
| discuss more about this in a separated thread.
Agree that we should keep an eye on this - perhaps too early to turn it into a
should. Networking speeds are growing, and many of the simulations were based
on TCP Reno which stems from the 10 Mbit ethernet era.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html