On 03/15/2016 06:54 PM, Sowmini Varadhan wrote: > On (03/15/16 16:55), zhuyj wrote: >> Sorry. I explain this in details. >> I have an similar problem. At first, I think it is related with tso. >> Then I made tests with pktgen tools and found that this similar >> problem still occurred whether >> tso is enabled or not. >> >> So I suggest to make tests with pktgen tools to exclude tso. >> > I realize that TSO might not be the root cause (Tushar also > pointed that out) but might just be triggering the issue... > > I dont think we need pktgen at this point- it's quite easy > to reproduce this on commodity Haswell servers, and by installing > the rds-stress from the rpm below: > > http://public-yum.oracle.com/repo/OracleLinux/OL6/ofed_UEK/x86_64//getPackageSource/rds-tools-2.0.7-1.12.el6.src.rpm > > To run it, set up 2 nodes connected on i40e. I shall call them > "client" and "server" though both will send traffic in the test > > Start the listener: > server# modprobe rds-tcp > server# rds-stress -r <server addr> > > Start the test: > > client# modprobe rds-tcp > client# rds-stress -r <client addr> -s <server-addr> -q 256 -a 8192 -d16 > -t16 -T30 > > (all params are explained in the rds-stress man page) > > If you do this on ixgbe, you will see that the column for "tx+rx K/s" > shows a steady throughput, whereas i40e numbers are bursty and low. > > Also, for i40e, you will see messages about TX hang on on the console. > > I think that, to find the root-cause, we need to see what is > triggering the mdd error. Hi,
Thanks for your reply. Yesterday I made tests with rds-tools. It is very pity that I can not reproduce my problem with rds-tools. But with pktgen tools, I can reproduce this problem easily. And I found that if I set the packet size to 17792 or less than this size, this problem would not occur. But if I set the packet size > 17792, for example 17793, my problem would occur. As such, maybe the packet size triggers my problem. I am not sure that the packet size will trigger your size. Best Regards! Zhu Yanjun > > Would be good if someone from Intel could provide some hints on > how to do that (or try the above tests!) > > --Sowmini ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
