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[Xen-users] Reading stats and detecting problems

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Reading stats and detecting problems
From: "G. Michael Carter" <mikey@xxxxxxxxxxxxxxx>
Date: Fri, 18 Jul 2008 09:32:43 -0400
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Still unhappy with my network speed and I've tried all the usual tricks from this mailing list.

When I to a virt-top it shows the network from and external machine to domU running at 64M/s, however the rsync is reporting the transfer working at 18M/s.   After a few seconds virt-top drops to 25M/s and rsync to 8M/s.    I'm assuming the difference is virt-top is reporting traffic coming into the device where rsync is reporting from end to end (through the virtual bridge)   Would this be correct?

Monitoring vmstat on the dom0 and domU

DomU:
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0  37388 191796   1372  19052    1    2    37     9   13   14  0  2 95  1  2
 0  0  37388 191136   1380  19684    0    0   213    36  331  539  0  7 92  0  1
 0  0  37388 190836   1388  19948    0    0    85     5  342  540  0  8 91  0  1
 0  0  37388 190716   1388  20068    0    0    43     0  330  551  0  6 94  0  0
-> Started Transfer
(About here)
 1  0  37388 150576   1524  54632    0    0   279  6859 2719 2857 16 23 53  6  3
 1  0  37388  77856   1600 123428    0    0   151 23521 4999 5647 42 50  1  0  7
 1  0  37388   9036   1676 191660    0    0    43 23059 5011 5778 41 51  0  0  8
 1  0  37388   3992   1300 195872    0    0   299 22208 4717 5630 39 52  0  0  9
 1  0  37388   3708   1372 196904    0    0   272 23557 5122 5745 43 52  0  0  4
 0  0  37388 197476   1376  13052    0    0    91  1381  721  973  2 10 88  0  0
 0  0  37388 196948   1388  13564    0    0   172    29  328  549  0  7 93  0  0
-> Cancelled Transfer (About here)
 
0  0  37388 196948   1388  13704    0    0    43     0  317  540  0  7 93  0  0

Dom0:
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 0  0 102780  64920  30040 464004    0    1  2965  1137   10    3  1  1 92  1  5
 0  0 102780  64648  30048 464016    0    0    47   889  744 1107  1  1 97  0  2
 0  0 102780  64648  30068 464256    0    0   157  1084  979 1058  0  0 97  0  2
 0  0 102780  64276  30072 464288    0    0   157   799  993 1076  0  0 96  0  4
 1  0 102780  64276  30084 464288    0    0    88   319  566  948  0  1 95  0  4
-> Started Transfer (About here)
 0  0 102780  64276  30088 464288    0    0   148  1131  641 1053  0  1 99  0  0
 0  0 102780  64028  30108 464572    0    0   304 18380 7232 1073  0  1 92  2  5
 0  0 102780  63796  30120 464748    0    0    91 23079 8133 1084  1  1 96  0  3
 0  0 102780  63780  30132 464844    0    0   189 23260 7857 1165  0  1 93  0  4
 0  0 102780  63284  30144 465100    0    0   192 23812 7961 1075  1  2 92  0  6
 5  0 102780  62912  30156 465352    0    0   225 14088 5662 1097  0  1 96  0  3
-> Cancelled Transfer (About here)
 0  0 102780  62680  30160 465556    0    0   167   111  584  975  0  0 98  0  1
 0  0 102780  62416  30180 465652    0    0   140   515  701  946  0  0 98  1  1

So do I interpret that the bottle neck here is CPU?   And that since before xen I could get 60MB/s transfer now 8-20MB/s it's the virtual bridge eating up my CPU.   

So what would my options be?   New quad core CPU?   More network cards?  Is there a network device out there which can handle the virtual bridge rather than putting the load on the CPU?   Any thoughts/suggestions?  

I purchased a 1Gbit router few months ago I'd like to get my money's worth out of it.   Hobbling along at 8MB/s average is almost what I used to have on 100baseT.

Thanks,
Michael

--
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