[AG-TECH] Mac buffer tweak?

[gurcharan khanna]

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.khanna at 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.khanna at rit.edu
Http:  www.rit.edu/~gskpop