Re: [Xen-devel] Xen & I/O in clusters - problems! New Information

[Håvard Bjerke <Havard.Bjerke@xxxxxxxxxxx>]

On Thu, Oct 28, 2004 at 01:44:44PM +0100, Ian Pratt wrote:
> 
> Please can you try Xen/linux 2.6.9. Also, please can you remind
> me of the spec of your machines. 
> 

Specs:
Ethernet controller: Intel Corp. 82547GI Gigabit Ethernet Controller
CPU: Intel(R) Pentium(R) 4 CPU 3.40GHz single cpu
RAM: 1 GB


The previous results from 2.4.27 are (I wrote kB/s earlier but that was wrong):
Native:
        130k interrupts
        114 MB/s
Xen0:
        180k interrupts
        80 MB/s                                                                 
                      

New results with 2.6.9:
Native:
        bandwidth: 2048000000 bytes in 17.42 real seconds = 114794.42 KB/sec
        CPU: 0.0user 1.4sys 0:17real 8%
        interrupts: 135k                                                        
       
Xen0:
        bandwidth: 2048000000 bytes in 21.77 real seconds = 91885.76 KB/sec
        CPU: 0.0user 16.2sys 0:21real 74%
        interrupts: 107k

I also tried sending localhost-localhost in 2.4.27, and interestingly Native 
performed 7:1 times better than xen0:
Native:
    bandwidth: 2048000000 bytes in 2.70 real seconds = 741704.96 KB/sec
    CPU: 0.0user 1.6sys 0:02real 62%
Xen0:
    bandwidth: 2048000000 bytes in 17.12 real seconds = 116838.03 KB/sec
    CPU: 5.9user 0.0sys 0:17real 34%

We've also recently benchmarked in an SMP cluster and achieved satisfying 
results, ie. around 114 MB/s with both Native and Xen0. But we're still 
wondering why we're not achieving full speed in a single-cpu cluster.

Håvard


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