Date: Fri, 1 Nov 2002 15:32:28 -0500 From: Barney Wolff <barney@tp.databus.com> To: Mark Allman <mallman@grc.nasa.gov> Cc: freebsd-net@freebsd.org Subject: Re: Problem in High Speed and Long Delay with FreeBSD Message-ID: <20021101203228.GA92397@tp.databus.com> In-Reply-To: <200211011928.OAA63524@guns.lerc.nasa.gov> References: <3DC2D147.8357C198@lmco.com> <200211011928.OAA63524@guns.lerc.nasa.gov>
next in thread | previous in thread | raw e-mail | index | archive | help
Try retrieving a very large file via ftp. The sendfile() code seems more efficient than ttcp, and if performance improves that may be a clue that the problem lies in the user/kernel interface. If not, probably in the stack. Could it conceivably be a resonance effect between the actual rtt and the stack timing granularity? I would also try setting ttcp's block size to a multiple of the exact transmitted seg size rather than a power of 2. Barney -- Barney Wolff http://www.databus.com/bwresume.pdf I'm available by contract or FT, in the NYC metro area or via the 'Net. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20021101203228.GA92397>