tcp sendspace

2003-09-18 Thread Antoine Jacoutot
Hi !

I just wanted to know if setting:
net.inet.tcp.sendspace=65535
was a bad idea ?
I'm not sure about all the consequences this could have, if any...
Thanks in advance.

Antoine

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Re: tcp sendspace

2003-09-18 Thread Chuck Swiger
Antoine Jacoutot wrote:
I just wanted to know if setting:
net.inet.tcp.sendspace=65535
was a bad idea ?
Probably not.

I'm not sure about all the consequences this could have, if any...
Are you trying to solve a problem or tune network performance, or are you just 
asking what happens if you twiddle this particular knob?  :-)

There's a formula involving network latency and bandwidth which is relevant; 
that, plus the amount of traffic (how many connections) determines how much RAM 
the larger network buffer size could/will take up.  You haven't told us what the 
machine is being used for, either-- network tuning a fileserver talking to 
clients on the LAN can be quite different than tuning a webserver feeding 
clients using 56K modems.

--
-Chuck
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Re: tcp sendspace

2003-09-18 Thread Antoine Jacoutot
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On Thursday 18 September 2003 19:26, Chuck Swiger wrote:
  was a bad idea ?

 Probably not.

Good :)

 Are you trying to solve a problem or tune network performance, or are you
 just asking what happens if you twiddle this particular knob?  :-)

I'm trying to tune network performance.

 There's a formula involving network latency and bandwidth which is
 relevant; that, plus the amount of traffic (how many connections)
 determines how much RAM the larger network buffer size could/will take up. 

The boxes I'm talking about have between 512 and 1 Go of RAM.

 You haven't told us what the machine is being used for, either-- network
 tuning a fileserver talking to clients on the LAN can be quite different
 than tuning a webserver feeding clients using 56K modems.

Well, I'm building some servers that are not in production yet, but will be 
soon,
They're all going to be intensively accessed, either with samba shares (inside 
the LAN -- users homedir and other shares) or http (from optical fiber 2MB 
connection) from the internet.

Antoine
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