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

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Igor Chubin <igor@xxxxxxx>
  • Date: Sun, 8 Apr 2007 12:04:15 +0300
  • Delivery-date: Sun, 08 Apr 2007 02:03:14 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

> > 
> > 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

Here is my problem:

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

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

Figure 1.

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

Figure 2.

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