> To: "David S. Miller" <davem@redhat.com>, "William L. Jones" > <jones@hpc.utexas.edu> > cc: linux-net@vger.kernel.org > Subject: Re: SO_SNDBUF > > > Thanks for the help. I have been trying to get netperf to work correctly > under > linux. It depends on getsockopt returning a value that represents the > window > size of the connection. Since getsockeopt was giving it a value that too > large by a factor of two it was setting it buffer incorrectly. Which was > causing poor performance, yes it matters. > > Bill Jones > Netperf had the additional bug in that it used the same variable for the setsockopt() and getsockopt() calls, and repeated iterations of netperf tests hence double the socket buffer sizes quickly to the max and stay there. I should have added that we ran into the same problem when testing with netperf, and a colleague of mine in the course of reviewing netperf for Rick Jones has fed some changes back to him for the next release. The test numbers which I just posted were with the modified netperf tests.. thanks, nivedita --- Nivedita Singhvi (503) 578-4580 Linux Technology Center nivedita@us.ibm.com IBM Beaverton, OR nivedita@sequent.com - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
