Re: [Xen-devel] etherbridge bottleneck

[David Becker <becker@xxxxxxxxxxx>]

" (1) Is Xen running on a UP, SMP or HT?

all of the above

" (2) If Xen is running on a SMP or HT, are xen0 and xenU running
" different processors or threads?

xm list doesn't break out HT contexts, so who's to say..

" (3) Which scheduler in Xen are you using? Have you changed any parameters?

factory defaults.


Here is a full account of configs and iperf speeds between domains
on an otherwise-idle host via the etherbridge, plus iperf speed over the
loopback interface for each domain.

Uni-processor (PIII)
        426 Mbps xenU UNI -> xen0 UNI
        267 Mbps xen0 UNI -> xenU UNI
        3.34 Gbps xen0 loopback
        3.14 Gbps xenU loopback

        xm list
         Name              Id  Mem(MB)  CPU  State  Time(s)  Console
         Domain-0           0       34    0  r----    297.0        
         grant              2      499    0  -b---    161.2    9602
        xm info
         system                 : Linux
         host                   : rack099-xen
         release                : 2.4.27-xen0
         version                : #3 Wed Nov 10 11:29:37 EST 2004
         machine                : i686
         cores                  : 1
         hyperthreads_per_core  : 1
         cpu_mhz                : 1396
         memory                 : 2047
         free_memory            : 1485

slow Uni HT processor (P4 2.0GHz)
        498 Mbps xenU HT1 -> xen0 HT0
        369 Mbps xen0 HT0 -> xenU HT1
        2.49 Gbps xen0 loopback
        2.54 Gbps xenU loopback

        xm list
         Name              Id  Mem(MB)  CPU  State  Time(s)  Console
         Domain-0           0       34    0  r----    561.7        
         globus             1      799    1  -b---    225.5    9601
        xm info
         system                 : Linux
         host                   : rack160-xen
         release                : 2.4.27-xen0
         version                : #2 Thu Nov 4 15:57:19 EST 2004
         machine                : i686
         cores                  : 1
         hyperthreads_per_core  : 2
         cpu_mhz                : 1993
         memory                 : 1023
         free_memory            : 167

faster Dual HT processors (P4 2.6GHz)
        645 Mbps xenU ctxt-1 -> xen0 ctxt-0
        470 Mbps xen0 ctxt-0 -> xenU ctxt-1
        782 Mbps xenU ctxt-2 -> xen0 ctxt-0
        563 Mbps xen0 ctxt-0 -> xenU ctxt-2
        747 Mbps xenU ctxt-1 -> xenU ctxt-2
        691 Mbps xenU ctxt-2 -> xenU ctxt-1
        3.34 Gbps xen0 ctxt-0 loopback
        3.50 Gbps xenU ctxt-1 loopback
        3.41 Gbps xenU ctxt-2 loopback

        xm list
         Name              Id  Mem(MB)  CPU  State  Time(s)  Console
         Domain-0           0       34    0  r----   1032.7        
         batch020           3     1999    1  -b---  108571.9    9603
         batch040           2     1799    2  r----  154375.3    9602
        xm info
         system                 : Linux
         host                   : rack276-xen
         release                : 2.4.27-xen0
         version                : #2 Thu Nov 4 15:57:19 EST 2004
         machine                : i686
         cores                  : 2
         hyperthreads_per_core  : 2
         cpu_mhz                : 2599
         memory                 : 3967
         free_memory            : 94


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