Hi, I'm really surprised to have absolutely zero feedback about this issue. Seems like no one has even had a look at the python script I've provided. I fear that others might be affected by this without knowing it...
The bug report is here : https://bugzilla.redhat.com/show_bug.cgi?id=489541 If anyone feels like doing either of these, I'd be really grateful : * Try to find something wrong in the python script I used for testing. * Run the script on servers with relatively high network traffic and post the results. Matthias Matthias Saou wrote : > Hi, > > I already reported this problem here a while back : On many RHEL5 > servers, we are seeing bogus bandwidth values being graphed through > snmp. Basically, we sometimes see 2Gbps peaks on Gigabit interfaces... > the curves themselves look good, but the values are way too high. > > The same bandwidth usage graphed directly from the switches to which the > servers are attached is fine (confirmed on various Dell, Cisco and Force > 10 equipments). > > What puzzled me at first is that looking at the bandwidth usage in real > time using "iptraf" reports what seems to be correct values. It seems > like it's the /proc values which are wrong (and ifconfig and snmp use > those). > > Attached is a simple python script which displays in real time the > network usage reported by using tcpdump (the iptraf way) and /proc (the > snmp way). > > On my (not busy at all) workstation (Fedora 10 x86_64), I currently see > this : > TCPDUMP: 2533105 (23445 packets) > PROC: 2507066 > > But on a busy web server, RHEL x86_64 5.3 domU, I see : > TCPDUMP: 1959818423 (1563119 packets) > PROC: 5320731075 > > This is quite a big difference. From my tests, there isn't a fixed > ratio between the two results and I see differences on all the servers > I've tried it on (domU, dom0, no Xen, with bonding etc.) > > With all this, the first question would be : Is there anything wrong > with the script I'm using? If any network and/or python experts want to > have a look... > > If the answer to the above is "nothing", then something really > wrong is going on... > > Matthias > -- Clean custom Red Hat Linux rpm packages : http://freshrpms.net/ Fedora release 10 (Cambridge) - Linux kernel 2.6.27.12-170.2.5.fc10.x86_64 Load : 0.24 0.16 0.18 _______________________________________________ rhelv5-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv5-list
