Date: Wed, 30 Jan 2013 12:32:32 -0500 From: Alfred Perlstein <bright@mu.org> To: freebsd-net@freebsd.org Subject: Re: [PATCH] Add a new TCP_IGNOREIDLE socket option Message-ID: <51095930.1050900@mu.org> In-Reply-To: <5109588D.9070504@freebsd.org> References: <201301221511.02496.jhb@freebsd.org> <201301291350.39931.jhb@freebsd.org> <5108562A.1040603@freebsd.org> <201301301158.33838.jhb@freebsd.org> <5109543B.4020304@mu.org> <5109588D.9070504@freebsd.org>
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On 1/30/13 12:29 PM, Andre Oppermann wrote: > On 30.01.2013 18:11, Alfred Perlstein wrote: >> On 1/30/13 11:58 AM, John Baldwin wrote: >>> On Tuesday, January 29, 2013 6:07:22 pm Andre Oppermann wrote: >>>> >>>> Yes, unfortunately I do object. This option, combined with the >>>> inflated >>>> CWND at the end of a burst, effectively removes much, if not all, >>>> of the >>>> congestion control mechanisms originally put in place to allow >>>> multiple >>>> [TCP] streams co-exist on the same pipe. Not having any decay or >>>> timeout >>>> makes it even worse by doing this burst after an arbitrary amount >>>> of time >>>> when network conditions and the congestion situation have certainly >>>> changed. >>> You have completely ignored the fact that Linux has had this as a >>> global >>> option for years and the Internet has not melted. A socket option >>> is far more >>> fine-grained than their tunable (and requires code changes, not >>> something a >>> random sysadmin can just toggle as "tuning"). >> >> I agree with John here. >> >> While Andre's objection makes sense, since the majority of Linux/Unix >> hosts now have this as a >> global option I can't think of why you would force FreeBSD to be a >> final holdout. > > Unless OpenBSD, NetBSD, Solaris/Ilumos also support this it is hardly a > majority of Linux/Unix hosts. And this isn't something a "sysadmin" > should > tune at all. > My apologies, I should have been more clear. I was speaking of majority of install base, not majority of distros. -Alfred
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