Hi Martin, Iperf isn't ignoring the -w flag, it's asking the OS for 4M of space but the OS is denying the request. Most likely this is due to the limits on the system being set too low. You can find information on raising those limits on this page:
http://fasterdata.es.net/fasterdata/host-tuning/ Jon On Mon, Apr 4, 2011 at 7:38 AM, Martin T <[email protected]> wrote: > If I execute Iperf(version 2.0.5 (08 Jul 2010) pthreads) client with > "iperf -c 192.168.2.1 -u -fm -t60 -d -b 10m -w 4m" command, Iperf > server with "iperf -s u -w 4m" command, Iperf client with "iperf -c > 192.168.1.1 -t 60 -w 2m" command etc, I get the "TCP window size: 50.0 > KByte (WARNING: requested 2.00 MByte)", "UDP buffer size: 0.01 MByte > (WARNING: requested 4.00 MByte)" or similar warning. In other words > the value of the "-w" flag seems to be ignored. One example: > > [root@ ~]# iperf -c 192.168.2.1 -u -fm -t60 -d -b 10m -w 4M > ------------------------------------------------------------ > Server listening on UDP port 5001 > Receiving 1470 byte datagrams > UDP buffer size: 0.04 MByte (WARNING: requested 4.00 MByte) > ------------------------------------------------------------ > ------------------------------------------------------------ > Client connecting to 192.168.2.1, UDP port 5001 > Sending 1470 byte datagrams > UDP buffer size: 0.01 MByte (WARNING: requested 4.00 MByte) > ------------------------------------------------------------ > [ 4] local 192.168.1.1 port 31589 connected with 192.168.2.1 port 5001 > [ 3] local 192.168.1.1 port 5001 connected with 192.168.2.1 port 38678 > > > > What might cause this? > > I Googled with 'iperf "WARNING: requested *"', but found anything useful. > > > regards, > martin > > ------------------------------------------------------------------------------ > Create and publish websites with WebMatrix > Use the most popular FREE web apps or write code yourself; > WebMatrix provides all the features you need to develop and > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf > _______________________________________________ > Iperf-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/iperf-users > ------------------------------------------------------------------------------ Create and publish websites with WebMatrix Use the most popular FREE web apps or write code yourself; WebMatrix provides all the features you need to develop and publish your website. http://p.sf.net/sfu/ms-webmatrix-sf _______________________________________________ Iperf-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/iperf-users
