Too many IPs assigned to an interface?

[Darcy Buskermolen]

On Wednesday 16 March 2005 07:46, Marc G. Fournier wrote:
> Since talking about ng_fec, and the cisco switch, I started to play with
> it a bit, and one of the things I've finally setup is snmp/mrtg, so that I
> can monitor bw activity ...
>
> one thing that I've noticed is that two of my machines are doing alot of
> bandwidth, while the other two are doing significantly less ...
>
> The thing is, the ones that are doing significantly less are the ones that
> have the most IPs assigned to their interfaces ...
>
> based on 5 minute averages:
>
> neptune -  68kb/s In, 119kb/s Out, 92 IPs assigned, Dual Xeon
> mars    - 289kb/s In, 320kb/s Out, 35 IPs assigned, Dual PIII
>
> vmstat 5 on neptune:
>
> 102 3 0 1722316 206436  258   0   1   0 465   0   4  49  511 3885 2398  3
> 86 12 102 3 0 1681208 205624   74   0   0   0  63   0   1   0  305 3293
> 1233  2 57 41 96 3 0 1702012 189492   69   0   0   0 845   0   6   6  342
> 3606 2066  6 53 41 91 3 0 1699380 151064   85   0   0   0 2072   0  12  12 
> 418 2752 3239  9 23 69 90 3 0 1681276 148584   53   0   0   0 463   0   1  
> 3  325 2554 2266  6 23 72
>
> vmstat 5 on mars:
>
> 11 5 0 4071268 211624 2329   1   2   1 1348 486   0   0  710  378 1049  6
> 24 70 14 5 0 4059324 198648 597648   0   0   0 920   0  18 157  933 7267
> 12086  4 56 40 15 5 0 4070128 189200 652140   1   0   0 853   0   4 122 
> 931 6188 9166  5 52 44 16 5 0 4056332 211964 693722   0   2   0 1690 1558  
> 1 167 1276 5614 4517  9 49 42 16 5 0 4012580 208272 722681   0   0   0 1133
>   0   3 137  909 3839 5456  6 48 46
>
> the other one that seems 'low' for traffic is a Dual Athlon (85 IPs) ...
> the other that is high for traffic is another Dual PIII (21) ...
>
> So, is network performance that greatly affected by # of IPs assigned to
> the interface itself?  Or is there maybe another factor involved?

Some other factor, I'd be inclined to thing the Jails are the factor here.
  I have boxen with multiple class C's worth of address assigned to them and 
they still push multi Mb/sec with little effort.

>
> ----
> Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
> Email: scrappy at hub.org           Yahoo!: yscrappy              ICQ: 7615664
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