Re: [Xen-devel] Pls help: netfront tx ring frozen (any clues appreciated)

[Steve Prochniak <steve.prochniak@xxxxxxxxxx>]

After digging up the code, when we observed this issue it was specific to the 
RX ring and it took about 4 days of nonstop traffic to reproduce.  So perhaps 
the issues are not related.

-----Original Message-----
From: Steve Prochniak 
Sent: Monday, April 09, 2012 3:09 PM
To: Konrad Wilk
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Pls help: netfront tx ring frozen (any clues 
appreciated)

I recall running into this problem while in development for a Network PV driver 
- though I don't recall if it was the TX or RX ring that would stall (maybe it 
was both or either).  During longevity testing, after days of nonstop traffic, 
something would go wrong and the interrupt would fail to clear.  This seemed to 
be a "after so many interrupts" bug, since halving the traffic would double the 
time necessary to reproduce.  At the time, we figured that we never saw this 
with the disk because it would have taken weeks to repro.

Mainly because of the length of time required to reproduce this, we never found 
out whether the problem was on the Dom0 or DomU side.  I worked around the 
problem by adding code that would detect that the condition was occurring, and 
then would trigger a reset of the event channel or interrupt.

Steve

-----Original Message-----
From: Konrad Rzeszutek Wilk 
Sent: Friday, April 06, 2012 4:32 PM
To: Vijay Chander
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Pls help: netfront tx ring frozen (any clues 
appreciated)

On Sat, Feb 25, 2012 at 07:46:36AM -0800, Vijay Chander wrote:
> If anybody encountered a similar situation as below where the netfront TX
> ring is stuck ,
> can you pls provide some pointers on how to get around this problem ?
> 
> This typically happens after about 2days of overnight traffic tests.

What kind of traffic? As in netperf for 48hrs? Is this from guest to guest
traffic or from outside host to the guest?

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