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Re: [Xen-devel] Re: [Xen-bugs] Re: [Xen-users] Network problem after updates

El mar, 22-06-2010 a las 10:41 -0400, Konrad Rzeszutek Wilk escribió:
On Tue, Jun 22, 2010 at 04:23:13PM +0200, Francisco Barrera wrote:
> Hello Konrad,
> I follow your suggestion and I downgrade the Xen dom0 and hipervisor to
> the 3.1.2 vesion and 2.6.18-194.3.1.el5xen kernel (versions by default
> in RHEL 3.5).
> At this moment all works fine, but this message in /var/log/mesages
> worry me a lot:
> pciback 0000:09:00.0: Driver tried to write to a read-only configuration
> space field at offset 0x4c, size 2. This may be harmless, but if you
> have problems with your device:
> 1) see permissive attribute in sysfs
> 2) report problems to the xen-devel mailing list along with details of
> your device obtained from lspci.

Well, do the second. Get the 'lspci -vvv' output of the device and lets
take a look at what offset 0x4c is? If might be complelty benign at
which point your problem is with something else.

This is the output of 'lspci -vvv' of the device:

09:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)
Subsystem: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (16000ns min), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 19
Region 0: Memory at d2000000 (64-bit, non-prefetchable) [size=32M]
Capabilities: [40] PCI-X non-bridge device
Command: DPERE- ERO- RBC=512 OST=8
Status: Dev=09:00.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=512 DMOST=8 DMCRS=32 RSCEM- 266MHz- 533MHz-
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: ffedf9efbfff9fec  Data: de3f

Anything appears in reference of 0x4c, or I don't understand you.

> This is the same message that appears in the previous update to xen
> 3.4.1 that I did make, and at the moment to make it, all works fine
> also.
> Then, after a lot of network traffic, the system began to freeze, as I
> describe in my first message.

Just to make sure I comprehend this properly.
 1). You are running the same software setup you did months ago after
     a brief update.
 2). Your machine freezes. But it did not freeze months ago when you
     ran the same software setup?

No, I don't explain correctly, I'm sorry for my English.
1). The software version running actually is the above I write, 3.1.2 in xen hypervisor and 2.6.18-194.3.1.el5xen in kernel, that are the versions by default in CentOS 3.5.
The software version running before the update to xen 3.4.1 was CentOS-5.2 with Xen 3.0.3 and kernel.
I've installed CentOS 3.5 because I assumed this versions are stables.
2). Now my machine don't freezes, but I suspect that will freezes when network traffic overloads some buffer

> The question is if I add the address in the message in the
> xend-pci-permissive file can solve this, or if I need to downgrade to
> lower version to avoid it.

I am definitly missing something here. You did have a stable version at
some point that did not exhibit any problems, correct? Is that the
version you are running now?

Ok, I've a stable version running now (that cames in CentOS 3.5), and at the moment I don't have any problem, only the message that I comment above.

Francisco Barrera

Móvil - +34 659253221

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