>> I'd use the second set of stats but at least these 2 look the same. >> >> Everything that is displayed in netstat -k is derived from kstats. >> If you want to avoid the curses stuff, you could try a form >> of dladm show-vnic with -s (for stats) and -i (for interval). > > Thanks, that seems like a simpler solution. > > But, I am still getting consumptions far exceeding the bw caps. I also see > netstat -k reporting utlization exceeding 100% at times. I checked my code > as well, and I don't see any problems with the measurement > > To see what's happening, I ran a wget on a 1G file. When I set the bw cap to > a certain number, it works fine. Say to 200Mbps, and I download the file, > it's limited to 200Mbps, no problem. But, if I change it in the middle to > say 300Mbps, no cap is being enforced after I execute the 'dladm > modify-vnic' command. In my SpecWeb experiment, I am changing bandwidth > every 10 secs. Is that too fast? How long does it take for the (new) cap to > get enforced? > > This may or may not be related to a problem we saw with 'tc' on Linux. We > found similar problem with capping in tc and figured out that we had to set > the right MTU and burst size for 1Gbps networks.
Any update on this? Is this a real problem or Am I using the tools incorrectly? For our control experiments, correct setting of bandwidth cap is crucial. Let me know how I can make capping work correctly. Thanks, Pradeep
