[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] sar incorrect network measurement in DomU
Hello Everyone, answers there, sorry for cross-posting. I'm using sar to monitor network throughput in a paravirtualized DomU and I'm seeing some odd values.
For example, if I run iperf on a 100 MBps network with another machine as the client and either dom0 or domU as the server, I get the same results: [ 4] local 192.168.0.1 port 5001 connected with 10.20.129.175 port 37766 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.1 sec 114 MBytes 94.1 Mbits/sec Dom0$ iperf -s [ 4] local 10.20.129.178 port 5001 connected with 10.20.129.175 port 58763 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.1 sec 113 MBytes 94.1 Mbits/sec 15:24:37 IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 15:24:38 eth0 3177.30 1591.41 4651.67 102.58 0.00 0.00 0.00 15:24:39 eth0 5641.67 2822.22 8264.16 181.90 0.00 0.00 0.00 15:24:40 eth0 5684.62 2840.56 8327.07 183.08 0.00 0.00 0.00 15:24:41 eth0 5722.54 2856.34 8382.62 184.10 0.00 0.00 0.00 15:24:42 eth0 5684.62 2825.17 8327.07 182.09 0.00 0.00 0.00 15:24:43 eth0 5682.52 2843.36 8324.00 183.26 0.00 0.00 0.00 15:24:44 eth0 5721.83 2857.04 8381.59 184.15 0.00 0.00 0.00 15:24:45 eth0 5764.54 2878.01 8444.15 185.50 0.00 0.00 0.00 15:24:46 eth0 5641.67 2808.33 8264.16 181.01 0.00 0.00 0.00 15:24:47 eth0 5802.86 2892.14 8500.28 186.41 0.00 0.00 0.00 15:24:48 eth0 2343.27 1171.35 3430.90 75.50 0.00 0.00 0.00 15:24:49 eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 15:24:50 eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 15:24:51 eth0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 15:24:52 eth0 0.50 0.50 0.01 0.02 0.00 0.00 0.00 Average: eth0 3410.19 1702.32 4995.05 109.72 0.00 0.00 0.00 During the test, sar gives roughly 8,5MB/s in rxkB/s, while it should be 11,76MB/s (94Mbps), as measured by iperf. When I run the same measurements in Dom0 I get far better results: 15:29:02 IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 15:29:02 eth0 20,00 0,00 2,38 0,00 0,00 0,00 0,00 15:29:03 eth0 5856,00 2938,00 8667,55 200,89 0,00 0,00 0,00 15:29:04 eth0 8125,00 4069,00 12029,87 278,15 0,00 0,00 0,00 15:29:05 eth0 8145,00 4073,00 12066,25 278,43 0,00 0,00 0,00 15:29:06 eth0 8121,00 4063,00 12027,94 277,74 0,00 0,00 0,00 15:29:07 eth0 8150,00 4055,00 12065,41 277,20 0,00 0,00 0,00 15:29:08 eth0 8122,00 4064,00 12029,42 277,81 0,00 0,00 0,00 15:29:09 eth0 8147,00 4079,00 12063,73 278,77 0,00 0,00 0,00 15:29:10 eth0 8123,00 4064,00 12029,34 277,88 0,00 0,00 0,00 15:29:11 eth0 8155,00 4096,00 12066,30 280,00 0,00 0,00 0,00 15:29:12 eth0 8129,00 4111,00 12029,02 281,03 0,00 0,00 0,00 15:29:13 eth0 3213,00 1631,00 4741,51 111,49 0,00 0,00 0,00 15:29:14 eth0 17,00 0,00 1,88 0,00 0,00 0,00 0,00 15:29:15 eth0 12,00 0,00 1,46 0,00 0,00 0,00 0,00 15:29:16 eth0 19,00 0,00 2,44 0,00 0,00 0,00 0,00 Average: eth0 5490,27 2749,53 8121,63 187,96 0,00 0,00 0,00 Has anyone seen something like this? Thanks, Ricardo José Pfitscher _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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