Date: Fri, 11 Apr 2003 18:42:57 +0200 From: Borje Josefsson <bj@dc.luth.se> To: Terry Lambert <tlambert2@mindspring.com> Cc: David Gilbert <dgilbert@velocet.ca> Subject: Re: tcp_output starving -- is due to mbuf get delay? Message-ID: <200304111642.h3BGgwKl087226@dc.luth.se> In-Reply-To: Your message of Fri, 11 Apr 2003 09:32:51 PDT. <3E96EE33.FAF4FABB@mindspring.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, 11 Apr 2003 09:32:51 PDT Terry Lambert wrote: > Borje Josefsson wrote: > > > A good thing to look at at this point would be: > > > > > > o Clean boot of FreeBSD target > > > o Run NetBSD against it > > > o Save statistics > > = > > What type of statistics do You mean? > = > Dropped packets; frags; delayed acks. The stuff you get from > "netstat -s" and "netstat -m". > = > > > You mean "bandwidth delay product". Yes, assuming you have packet > > > loss. From your description of your setup, packet loss should not > > > be possible, so we can discount it as a factor. > > = > > Of cause packet loss is possible on a nationwide network. If I loose = a > > packet on the (expected) 10 second test (with NetBSD), recovering fro= m > > that drops performance from 900+ to ~550 Mbps. Thos shows very clearl= y if > > I run "netstat 1". > = > You are running these tests over .se's nationwide network? One of them, I'm using GigaSunet, the nationwide network for the = universities in Sweden. 10 Gbps to 22 cities, connecting 35 universities = with 2,5G (redundant). This not a "research network" per se, it's the = "production" network for the universities. If I suceeed with this, the = next challenge (no kidding) is to try the same thing over the commodity = Internet from here to California (or sonething similar), showing that You= = don't need a "private" network for high speed communication if You do = things right. After that I've thought of testing against Japan or New = Zealand, which is about as far You can get from here :-) --B=F6rje
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200304111642.h3BGgwKl087226>