Date: Fri, 01 Jun 2007 02:21:13 +0800 From: Pang <freebsd@laws.ms> To: freebsd-questions@freebsd.org, freebsd-net@freebsd.org Subject: Re: Download speed and TCPIP window sizing Message-ID: <465F1219.3080004@laws.ms> In-Reply-To: <37f6bd601e453b39a3f70c0e95be3876@75.126.162.136> References: <465ED66F.30902@laws.ms> <37f6bd601e453b39a3f70c0e95be3876@75.126.162.136>
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Thanks for reply. Nicolas Gieczewski wrote: > On Thu, 31 May 2007 22:06:39 +0800, Pang <freebsd@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. > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > Thanks Pang
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