Re: Fw: Re: [Xen-users] bridge throughput problem

[Mike Williams <mike@xxxxxxxxxxx>]

Fasiha, you're not alone.
I've got a xen-tip/master pv_ops dom0 running, and I get roughly the same 
figures you do.
0.14 domU to domU, and 12990.91 domU to dom0.
The netserver end is completely idle (as reported by sar), as is dom0, during 
all test.

Whereas a 2.6.18 based kernel on an old dual p3 xeon gets 327 and 456 
respectively.

On Monday 07 September 2009 11:15:01 Fasiha Ashraf wrote:
> I have tried what you suggested me. I pinned 1 core per guest also pin 1
> core to Dom0 instead of allowing dom0 to use all 8 cores. But the results
> remained same. Below are the details:-
> [root@HPCNL-SR-2 ~]# xm vcpu-list
> Name                                ID  VCPU   CPU State   Time(s) CPU
> Affinity Domain-0                             0     0     0   r--      69.4
> any cpu Domain-0                             0     1     -   --p       4.7
> any cpu Domain-0                             0     2     -   --p       6.2
> any cpu Domain-0                             0     3     -   --p       5.5
> any cpu Domain-0                             0     4     -   --p       4.7
> any cpu Domain-0                             0     5     -   --p       3.5
> any cpu Domain-0                             0     6     -   --p       3.8
> any cpu Domain-0                             0     7     -   --p       3.5
> any cpu F11-G1S2                                   0                   0.0
> any cpu F11-G2S2                             1     0     1   -b-      14.7
> 1 F11-G3S2                             2     0     2   -b-      14.9 2
> F11-G4S2                                   0                   0.0 any cpu
>
> [root@F11-G2S2 ~]# netserver
> Starting netserver at port 12865
> Starting netserver at hostname 0.0.0.0 port 12865 and family AF_UNSPEC
>
> [root@F11-G3S2 ~]# netperf -l 60 -H 10.11.21.212
> TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.11.21.212
> (10.11.21.212) port 0 AF_INET Recv   Send    Send
> Socket Socket  Message  Elapsed             
> Size   Size    Size     Time     Throughput 
> bytes  bytes   bytes    secs.    10^6bits/sec 
>
>  87380  16384  16384    60.05       0.29  
>
> There is something strange that I have observed in my set-up, when i
> traceroute guest it doesn't reach any destination. do not get reply from
> nay hope. 
> [root@F11-G3S2 ~]# traceroute 10.11.21.212
> traceroute to 10.11.21.212 (10.11.21.212), 30 hops max, 60 byte packets
>  1  * * *
>  2  * * *
>  3  * * *
>  4  * * *
>  5  * * *
>  6  *^C
> it displays the same stars till 30. normally it doesn't happen. It should
> be something like [root@F11-G3S2 ~]# traceroute 10.11.21.32
> traceroute to 10.11.21.32 (10.11.21.32), 30 hops max, 60 byte packets
>  1  10.11.21.32 (10.11.21.32)  0.740 ms  0.710 ms  0.674 ms
>
> I feel there is some network configuration issue. would Please guide me how
> to find out the route cause and to resolve the problem. How can i check
> ICMP thing in  my fedora11 system?
>
> Regards,
> Fasiha Ashraf
>
> --- On Sat, 5/9/09, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
>
> From: Fajar A. Nugraha <fajar@xxxxxxxxx>
> Subject: Re: [Xen-users] bridge throughput problem
> To: "Fasiha Ashraf" <feehapk@xxxxxxxxxxx>
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Date: Saturday, 5 September, 2009, 4:59 PM
>
> On Sat, Sep 5, 2009 at 12:06 PM, Fasiha Ashraf<feehapk@xxxxxxxxxxx> wrote:
> > What is Guest1 and Guest2?
> > These are PV domUs of Fedora11(32bit).
> > Is it on the same dom0 or on different dom0?
> > Yes, they are on the same host on same physical machine.
>
> Perhaps it's CPU/interrupt issue. Can you make sure that dom0, guest1,
> and guest2 ONLY use 1 vcpu each, and they're located on DIFFERENT
> physical cpu/core (xm vcpu-set, xm vcpu-pin), and repeat the test.
>
> Also, have another window running for each dom0/domU, and observe CPU
> load during that test with "top". Which domain uses 100%? Is it user
> or system?

-- 
Mike Williams

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