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xen-devel
Re: [Xen-devel] etherbridge bottleneck
" (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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