Date: Mon, 1 Jul 2002 12:13:24 -0500 From: D J Hawkey Jr <hawkeyd@visi.com> To: Terry Lambert <tlambert2@mindspring.com> Cc: DougB@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: ftp and mail much slower into fbsd 4.4 vs and old BSDi Message-ID: <20020701121324.A6798@sheol.localdomain> In-Reply-To: <3D2089D5.89D0CE7D@mindspring.com>; from tlambert2@mindspring.com on Mon, Jul 01, 2002 at 09:56:53AM -0700 References: <5.1.0.14.2.20020629235459.031daf28_mail.Go2France.com@ns.sol.net> <3D1EB35C.70F64275_FreeBSD.org@ns.sol.net> <200207011600.g61G0RW06589@sheol.localdomain> <3D2089D5.89D0CE7D@mindspring.com>
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On Jul 01, at 09:56 AM, Terry Lambert wrote:
>
> D J Hawkey Jr wrote:
> > > You can turn off newreno with the sysctl. I put this in /etc/sysctl.conf
> > > on my machines:
> > >
> > > net.inet.tcp.newreno=0
> >
> > Could you explain what newreno is, in a nutshell, the upshots of using it,
> > and what the ramifications of turning it off are?
> >
> > I'm running FreeBSD 4.5-RELEASE-p7, and it's on by default.
>
>
> If you turn it off, you rat all your firends out in the Prisoner's
> Dilemma.
>
> Congestion control protocols only work if everyone participates.
>
> All "Reno TCP" implementations include TCP Fast Retransmit and Fast
> Recovery algorithms [RFC2581]...
>
> [SNIP]
>
> ...THat's the PSC "nutshell" description of NewReno.
OK. Thanks, Terry.
I'm guessing that the suggestion to turn it off (the original thread) is
valid enough, as all machines referred to were on the same network, else
why wouldn't the above still hold true? Or is it a matter of FTP and/or
SMTP (specifically, sendmail) not playing nice with newreno?
> -- Terry
Dave
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