Re: [Xen-users] Re: xen bonding and network performance dropping to ~ 0.1%

[Igor Chubin <igor@xxxxxxx>]

...
> > 
> > Are you aware of this issue?
> > http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=753
> > 
> > May be your problem is related to this?
> 
> Yes, I've seen this report, and while the vlan parts and the oops are
> not releavnt to my case, the explanation in
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=753#c12 seems
> to match, but the suggested solution is to apply two patches that have
> already been applied in kernels >= 2.6.17 and I see this on kernels
> 2.6.18 (RHEL5) and 2.6.20 (FC6).


I experience similar problem.

But I don't use interface bonding at all!

In my installation I use 8021Q.
(I use 2.6.18 also, but Debian, not FC. My Xen is 3.0.4, Debian
package)



Here is my problem:


If I don't use xenbr0 (fig.1)
all works fine.



                     eth0    .---- eth0   VLAN1 [192.168.1.1]
============================<----- eth0.2 VLAN2 [192.168.2.1]
(tagged)                     .____ eth0.3 VLAN3 [192.168.3.1]

Figure 1.



      peth0 +------+ eth0    .---- eth0   VLAN1 [192.168.1.1]
============|xenbr0|========<----- eth0.2 VLAN2 [192.168.2.1]
(tagged)    +------+         .____ eth0.3 VLAN3 [192.168.3.1]

Figure 2.






But when I add the bridge (using netowrk-bridge script)
from external network
I can see untagged interface (192.168.1.1) only.



If I add ARP entry with IP and MAC of external 
host that I want to ping to this host's ARP-table,
    
    arp -s 192.168.2.2 00:11:22:33:44:55 

I can ping external host.




I have looked to interfaces peth0, xenbr0, eth0 and its
subinterface eth0.2 using tcpdump
and marked that ARP-requests can be seen on all of the interfaces,
but ARP replys are on peth0 and xenbr0 only.

I have faced the problem on the only one of my Xen installations.
On the rest all works fine.


The question to all:
Have anybody seen similar problem and what can you advice me?


Can anybody say, may described problem be related to network card
that I use?
In particular to 8021Q hardware acceleration or something like that?




Axel, I understand that the problem is not like yours,
but may be it helps you to get a clue.




> -- 
> Axel.Thimm at ATrpms.net



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> http://lists.xensource.com/xen-users

-- 
WBR, i.m.chubin


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