Re: [Xen-devel] pvops domu soft lockup under load (more logs)

[Pim van Riezen <pi+lists@xxxxxxxxxxxx>]

Oh,

On Apr 16, 2010, at 9:37 , Pim van Riezen wrote:

> Another datapoint. This customer has similarly loaded VPS machines on a 
> number of different hardware nodes. Not all of them had the lockup problem. I 
> applied the jiffies clocksource to all his machines, regardless of their 
> current problem status. After a day without lockups, the customer complained 
> about time drift (ntp was not activated). The guest that had experienced the 
> soft lockups earlier had major clock drift and were way ahead:
> 
>       16 Apr 09:29:26 ntpdate[11236]: step time server 194.109.22.18 offset 
> -7337.731686 sec 
> 
> That's over 2 hours accumulated in less than 24 hours of uptime. The guests 
> that hadn't been excperiencing the lockup issues berfore switching to the 
> jiffies clocksource hadn't drifted that much after the switch and were, at 
> most, 120s behind after the same amount of runtime.

There's more correlation between the guests that had the lockups and those that 
didn't: the guests that locked up (and now have a way speedy jiffies clock) 
were all on the same hardware platform, with an older Xeon CPU than on the 
guests that had no issues. I attached cpuinfo for both the broken and the 
non-broken dom0s. All are on Xen-3.4.1 (hypervisor-version doesn't seem to 
affect this issue) and the latest CentOS 2.6.18 dom0-kernel.

Cheers,
Pim

Attachment: cpuinfo_lockups.txt
Description: Text document

Attachment: cpuinfo_nolockups.txt
Description: Text document

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