Download speed and TCPIP window sizing

[Pang]

Thanks for reply.

Nicolas Gieczewski wrote:
> On Thu, 31 May 2007 22:06:39 +0800, Pang <freebsd at laws.ms> wrote:
>   
>>   Recently, I have leased a rack in Asianetcom and some bandwidth.
>> However, the speed for my curcuit is substantially slower than my
>> provider's company site.
>> [...]
>> *This server is using FreeBSD 6.2 patch 4 with Apache in the port tree.
>> The kernel is custom built but I haven't made any modification in sysctl
>>
>>   I have asked many techs in Asianetcom and they blamed on TCPIP window
>> sizing.
>>     
>
> I used to have the same problem with my FreeBSD dedicated servers in the U.S. when I was living in South America with a latency of ~200 ms. Given identical hardware and connectivity, I could max out my download speed when downloading from a server running Linux, but would get no more than 100-150 KB/s when downloading from an otherwise identical FreeBSD box.
>
> The solution was to increase the size of the TCP send window on the FreeBSD server to about 128 KB--the default of 32 KB turned out to be way too small.
>
> # sysctl net.inet.tcp.sendspace=131072
>
> After modifying this value, you need to restart any processes (e.g. Apache) that you want to take advantage of the change.
>   

It doesn't work. I am still getting ~10KB/s speed.


> Hope it helps.
>
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>   

Thanks
Pang