On Thu, 31 May 2007 22:06:39 +0800, Pang <[EMAIL PROTECTED]> 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.

Hope it helps.

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