- Os X Get Current Setting For Net.inet.tcp.delayed_ack Time
- Os X Get Current Setting For Net.inet.tcp.delayed_ack Money
I am trying to change the delayedack value to 0 from 3(default) in OS X. I can change the send space programmatically, but not the delayedack. Int sendspace,retval,newsendspa. Leave it to Mac OS X Snow Leopard to provide you with network configuration assistance when you first open the Network pane. (Whether you get this absolutely free offer of aid depends on whether you upgraded your Mac from a previous version of Mac OS X or whether you entered your network and Internet settings within the Snow Leopard Setup Assistant.). The messages in tr-udp.c around line 77 only give advice on fixing the issue on Linux. It would be great to add a Mac OS X version. I believe that the right sysctl on FreeBSD and Mac OS X is kern.ipc.maxsockbuf. It would be great if somebody could check that running sysctl -w kern.ipc.maxsockbuf=4194304. Setting TCPQUICKACK immediately sends an ACK if there is anything that needs to be ACK'ed, so I think this is sufficient. – ephemient Oct 23 '09 at 20:11 I am still send ing on that socket. But as I said, I am not responding to messages I receive. It's a bad idea to go changing around anything in /System because an update to OS X could easily clobber it. Make your own StartupItem and throw it in /Library. I won't describe the process in detail but it's painfully obvious if you are familiar with shell scripting and take a look at any of the ones that are there. On Mac OS X you can get this effect by running sudo sysctl -w net.inet.tcp.delayedack=0. I've heard that the Linux kernel have a very advanced IP stack and can use many different TCP congestion avoidance algorithm. I don't know if that has anything to do with TCP acknowledge frequency.
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After creating these files in Emacs, how do I save them? I read the man pages for Emacs, but I really couldn't understand how it works.
For emacs, you will want to type control-x then control-s to save, then control-x control-c to exit.
I guess I should have put those commands in there.
ctrl-x then ctrl-s saves. ctrl-x then ctrl-c saves and exits.
You could just use pico instead.
Or use BBEdit or whatever makes you happy.
As long as it handles newlines properly, you should be alright.
Tim
ctrl-x then ctrl-s saves. ctrl-x then ctrl-c saves and exits.
You could just use pico instead.
Or use BBEdit or whatever makes you happy.
As long as it handles newlines properly, you should be alright.
Tim
I did use bbedit, and I got the following upon attempting to run the script: this despite having saved linebreaks as 'UNIX' wha'appened?
Is there a service that can be restarted instead of rebooting?
Calibre for mac os x 10.6 8. All you have to do when you change settings in sysctl.conf is:
sudo sh /etc/rc.sysctl
As always with the sudo command you'll need an administors password.
Tim
sudo sh /etc/rc.sysctl
As always with the sudo command you'll need an administors password.
Tim
It's a bad idea to go changing around anything in /System because an update to OS X could easily clobber it. Make your own StartupItem and throw it in /Library. I won't describe the process in detail but it's painfully obvious if you are familiar with shell scripting and take a look at any of the ones that are there.
Would be nice to see a how to article w/correct info
Considering all the reported errors in the original posting and now the advice that this should be done with a Startup Item, it would be very helpful to have an article posted on how to do this correctly via Startup Items. I was so confused by all the corections in the comments that I've just given up.
RE:Would be nice to see a how to article w/correct info
Well, If there is enough interest, I would write it out in plain text.
The errors were a result of my failure to escape certain characters
which have different meaning to HTML than to the shell.
You'll notice I did use a StartupItem. The suggestion was to create a new
one in /Library/StartupItems. There have already been a number of hints that
explain how to do that. If we are lucky this will be a feature in 10.2.
If that does wind up being the case then most of this hint would be moot.
All that would be needed would be to create/edit /etc/sysctl.conf.
In any case, if this seems difficult to you even with corrections then perhaps
it is not an area you should be fooling around with anyway.
The errors were a result of my failure to escape certain characters
which have different meaning to HTML than to the shell.
You'll notice I did use a StartupItem. The suggestion was to create a new
one in /Library/StartupItems. There have already been a number of hints that
explain how to do that. If we are lucky this will be a feature in 10.2.
If that does wind up being the case then most of this hint would be moot.
All that would be needed would be to create/edit /etc/sysctl.conf.
In any case, if this seems difficult to you even with corrections then perhaps
it is not an area you should be fooling around with anyway.
There is an error in the script, which is in the line after
Internet explorer 6 for mac os x 10.4.11. There should be a ' before the '#' to stop the shell from interpreting the line as a comment:
Os X Get Current Setting For Net.inet.tcp.delayed_ack Time
It appears that backslash characters are being 'reduced' by the 'posting' editor--in plain text you need two in the message for each one you want in the output, and in HTML you need FOUR!!!
I'm surprised that this script isn't there already, as it's a standard FreeBSD script. Maybe someone with Jaguar can check whether it's there in the newer OS?
Os X Get Current Setting For Net.inet.tcp.delayed_ack Money
You are correct. Thanks for spotting this.
I chose to edit the startup item because they were
already using the sysctl command there. Good point though
about editing /System/Libray/StartupItems. I just copied
the /System/Libray/StartupItems/SystemTuning to /Library/StartupItems
and edited out the original text leaving my added script. It works fine,
but sysctl.conf is read much later in the boot sequence.
I do hope that they include this function in 10.2.
I chose to edit the startup item because they were
already using the sysctl command there. Good point though
about editing /System/Libray/StartupItems. I just copied
the /System/Libray/StartupItems/SystemTuning to /Library/StartupItems
and edited out the original text leaving my added script. It works fine,
but sysctl.conf is read much later in the boot sequence.
I do hope that they include this function in 10.2.
There are a couple more errors, the last two lines of /etc/rc.sysctl should be:
[whitespace]done < /etc/rc.sysctl
fi
the keyword/value pairs in /etc/sysctl.conf should be
kw=val instead of kw: val
It's kind of hard to post code fragments as HTML without being able to escape angle brackets, etc.
[whitespace]done < /etc/rc.sysctl
fi
the keyword/value pairs in /etc/sysctl.conf should be
kw=val instead of kw: val
It's kind of hard to post code fragments as HTML without being able to escape angle brackets, etc.
.. that way no one will have to bother with an erroneous article.
..Or deal with Noise makers.