netdev - Re: [PATCH] make _minimum_ TCP retransmission timeout configurable

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

Message-Id: <20070829.152812.74548456.davem@davemloft.net>
Date:	Wed, 29 Aug 2007 15:28:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	ian.mcdonald@...di.co.nz, rick.jones2@...com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] make _minimum_ TCP retransmission timeout configurable

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Wed, 29 Aug 2007 15:13:01 -0700

> There was some discussion about implementing TCP NCR (RFC4653)
> and Narasimha Reddy said he might have something that could be used.

Although this looks interesting, I'm unsure it will help these
cell folks.  Actually I can't tell for sure until Rick provides
us with some more details of the exact issue at hand.

NCR seems to deal with when the trigger loss recovery, whereas
the cell phone network folks aparently want to jack up TCP_RTO_MIN
so that hard timeout based retranmits are deferred a lot more
than normal.

And reading NCR some more, we already have something similar in the
form of Alexey's reordering detection, in fact it handles exactly the
case NCR supposedly deals with.  We do not trigger loss recovery
strictly on the 3rd duplicate ACK, and we've known about and dealt
with the reordering issue explicitly for years.

-
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