[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] etherbridge bottleneck
David, You might want to try giving one of your domains a second VIF and then manually assign an IP address to the vifX.Y interface in domain 0 rather than using the bridge. I doubt the bridge is a serious overhead in xenU<->xenO communication, but it would be useful to eliminate it from your results. For high-performance xenU<->xenU communication it probably makes sense to setup a direct netfront/back connection (to avoid going via the dom0 bridge). Although the netfront/back drivers are quite happy working point-to-point, I doubt xend will let you set this up right now. Shouldn't be too hard to fix, though... Ian > -----Original Message----- > From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx > [mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of > David Becker > Sent: 11 November 2004 14:57 > To: xen-devel@xxxxxxxxxxxxxxxxxxxxx > Subject: 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 > > > ------------------------------------------------------- > This SF.Net email is sponsored by: > Sybase ASE Linux Express Edition - download now for FREE > LinuxWorld Reader's Choice Award Winner for best database on Linux. > http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/xen-devel > > ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_idU88&alloc_id065&op=click _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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