Christoph Willing wrote: > > On 10/11/2007, at 7:56 AM, gurcharan khanna wrote: > >> Mark, >> >> my link to the source for this seems to be broken but here's what i >> have personally on my mac. >> >> in /etc/sysctl.conf, add these lines: >> >> >> net.inet.tcp.recvspace=4000000 >> net.inet.tcp.sendspace=4000000 >> kern.ipc.maxsockbuf=8000000 > > > Those settings look like they may have come from: > http://www.psc.edu/networking/projects/tcptune/ You're right about the URL. However, the link doesn't work anymore.... > > However, note that TCP tuning is the subject there, not UDP (which is > what multicast uses). Understood. However, changing these settings DOES in fact improve things considerably, predictably, and repeatedly. I don't quite understand it, but it does work.
-gurcharan > > > chris > > > >> you probably have to restart to activate them. you can set these from >> the command line as well but they won't "stick", but you can try out >> different >> settings that way. >> >> use: sysctl -w net.inet.tcp.recvspace=4000000 (for example) >> >> to set these values interactively. >> >> -gurcharan >> >> >> >> Leonard, Mark wrote: >>> Listers-- >>> >>> It was probably a year ago that a setting change for Mac OS that >>> improved video quality of big video multicast streams (Gurcharan?) >>> but I >>> can't seem to find it any where... >>> >>> Can someone repost or point me towards a troubleshooting page for >>> tweaks >>> like this? >>> >>> Thanks >>> Mark >>> >>> >>> Mark Leonard >>> DL Studios, UNH >>> 603-862-0192 >>> >>> >>> >>> >>> >> >> -- >> ------------------------- >> Gurcharan S. Khanna, Ph.D. >> Director of Research Computing >> Office of the Vice President for Research >> >> Director, Interactive Collaboration Environments Laboratory, >> Center for the Advancing the Study of Cyberinfrastructure >> --- >> Rochester Institute of Technology >> 1 Lomb Memorial Drive >> Rochester, New York 14623-5603 >> Phone: 585-475-7504 ~ Cell: 585-451-8370 >> Email: gurcharan.kha...@rit.edu >> Http: people.rit.edu/gskpop >> > > Christoph Willing +61 7 3365 8350 > QCIF Access Grid Manager > University of Queensland > > > -- ------------------------- Gurcharan S. Khanna, Ph.D. Director of Research Computing Office of the Vice President for Research Director, Interactive Collaboration Environments Laboratory, Center for the Advancing the Study of Cyberinfrastructure --- Rochester Institute of Technology 1 Lomb Memorial Drive Rochester, New York 14623-5603 Phone: 585-475-7504 ~ Cell: 585-451-8370 Email: gurcharan.kha...@rit.edu Http: www.rit.edu/~gskpop
