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

[Igor Chubin <igor@xxxxxxx>]

On Sa, Apr 07, 2007 at 08:27:06 +0200, Axel Thimm wrote:
> On Sat, Apr 07, 2007 at 05:45:24PM +0200, Axel Thimm wrote:
> > after some patching of the xen scripts (to properly `migrate' slaves
> > over from bond0 to pbond0), I have xen and bonding working. But only
> > for 20-25 seconds, after that the network throughput suddenly falls
> > from for example 110MB/sec to 70-120KB/sec, e.g. about a factor of
> > thousand. Stopping the network bridge restores the throughput, but
> > again after a short delay of 0.5-1 minute.
> > 
> > Does that ring a bell? What can be the troublemaker and why does it
> > appear with such a great delay? There is no hint in the logs on why
> > the performance drops that dramatically.
> 
> I checked where the packets got dropped by checking ICMP traffic on
> 
> o eth0,eth1 the two slaves
> o pbond0 the physical bond of these two
> o xenbr0
> o bond0, aka veth0
> 
> While the network works well, the ICMP requests/replies can be seen on
> all interfaces [1]. When the network breaks down to below 1% of its
> bandwidth I can see the external ICMP requests reaching as far as
> xenbr0. The virtual interface bond0 does not see the packets anymore.
> 
> So it looks like the bridge is leaking the packets, even after the
> packets have passed into the bridge through the bonded device. This
> makes it even more mysterious, since if the issue was bonding &
> bridges I would expect the packets to drop on the incoming side of
> the bridge.
> 

Are you aware of this issue?
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=753

May be your problem is related to this?


-- 
WBR, i.m.chubin


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