Hi Harris, That looks pretty good to me : )
Cheers, Ben On 04/10/2010, at 7:06 PM, Harris Hui wrote: > Hi Ben, > > Thanks for your suggestion. > > I had performed the iPerf UDP test, do you think is it normal for the 100Mbps > link? > > Host A (10.16.xx.58) <-----> EX 4200 Switch <------> J6350 (MTU 9018) <----- > Fiber circuit 100Mbps (from West to East coast ~80ms) ------> (MTU 9018) > J6350 <------ EX 4200 Switch ------> Host B (10.26.xx.60) > > > r...@xxxxxxx bin]# ./iperf -c 10.26.xx.60 -t 60 -u -b 100M > ------------------------------------------------------------ > Client connecting to 10.26.xx.60, UDP port 5001 > Sending 1470 byte datagrams > UDP buffer size: 126 KByte (default) > ------------------------------------------------------------ > [ 3] local 10.16.xx.58 port 48543 connected with 10.26.xx.60 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-60.0 sec 719 MBytes 101 Mbits/sec > [ 3] Sent 512816 datagrams > [ 3] Server Report: > [ 3] 0.0-60.0 sec 656 MBytes 91.7 Mbits/sec 0.206 ms 45108/512815 (8.8%) > [ 3] 0.0-60.0 sec 1 datagrams received out-of-order > > [r...@xxxxxxx bin]# ./iperf -c 10.26.xx.60 -t 60 -u -b 70M > ------------------------------------------------------------ > Client connecting to 10.26.xx.60, UDP port 5001 > Sending 1470 byte datagrams > UDP buffer size: 126 KByte (default) > ------------------------------------------------------------ > [ 3] local 10.16.xx.58 port 25968 connected with 10.26.xx.60 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-60.0 sec 501 MBytes 70.0 Mbits/sec > [ 3] Sent 357143 datagrams > [ 3] Server Report: > [ 3] 0.0-60.0 sec 501 MBytes 70.0 Mbits/sec 0.276 ms 0/357142 (0%) > [ 3] 0.0-60.0 sec 1 datagrams received out-of-order > > [r...@xxxxxxx bin]# ./iperf -c 10.26.xx.60 -t 60 -u -b 80M > ------------------------------------------------------------ > Client connecting to 10.26.xx.60, UDP port 5001 > Sending 1470 byte datagrams > UDP buffer size: 126 KByte (default) > ------------------------------------------------------------ > [ 3] local 10.16.xx.58 port 31085 connected with 10.26.xx.60 port 5001 > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-60.0 sec 572 MBytes 80.0 Mbits/sec > [ 3] Sent 408164 datagrams > [ 3] Server Report: > [ 3] 0.0-60.0 sec 568 MBytes 79.4 Mbits/sec 0.221 ms 2961/408163 (0.73%) > [ 3] 0.0-60.0 sec 1 datagrams received out-of-order > > Thanks > - Harris > > <graycol.gif>Ben Dale ---04/10/2010 07:56:24 AM---Hi Harris, However, > increasing the MTU size on both the J6350s may not be able to get a better > TCP throughput, because the Host > > <ecblank.gif> > From: <ecblank.gif> > Ben Dale <bd...@comlinx.com.au> > <ecblank.gif> > To: <ecblank.gif> > Harris Hui/Hong Kong/i...@ibmhk > <ecblank.gif> > Cc: <ecblank.gif> > juniper-nsp@puck.nether.net > <ecblank.gif> > Date: <ecblank.gif> > 04/10/2010 07:56 AM > <ecblank.gif> > Subject: <ecblank.gif> > Re: [j-nsp] J6350 Jumbo frame MTU and OSPF setting > > > > Hi Harris, > However, increasing the MTU size on both the J6350s may not be able to get a > better TCP throughput, because the Host NICs and Switchport are also using > MTU 1500 right? Should I change the MTU size on Host NICs and Juniper EX > switches to MTU 9018 in order to prevent the frame fragmentation happened > below 9018? > There should be no more drops if your end devices are 1500 MTU and the "core" > network is 9018. As for your throughput, that is a little harder to > calculate, but the figures you are quoting seem quite low even with 80 ms > latency. > > Latency aside, you should be able to easily saturate a 100Mbps pipe with 1500 > byte frames on a J6350 without issue (in terms of PPS). I don't believe > adjusting the MTU size is going to make that much difference, but it is worth > trying. I would be inclined to kick off iperf with a UDP test with 1500 byte > frames to see what throughput you can get out of the pipe first, then start > investigating TCP/MSS issues. > > Cheers, > > Ben > > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
