From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bill Burns <bburns@redhat.com>
Subject: Re: Time went backwards errors booting unstable cs 17557
	with 64GB memory
Date: Tue, 06 May 2008 11:40:01 -0400
Message-ID: <48207BD1.8030807@redhat.com>
References: <089B0D75973E1241B941D0A9854F23FC0C147A70@USEA-EXCH2.na.uis.unisys.com>
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To: "Carb, Brian A" <Brian.Carb@unisys.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
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Carb, Brian A wrote:
> I've built the latest xen unstable cs 17557 to run on a multi-cell
> ES7000/one. When I boot with the procs and memory from a single cell (4
> cores aka 8 cpus from cell0, 32gb memory from cell0), dom0 boots cleanly
> . However, if I use the memory from 2 cells (4 cores aka 8 cpus from
> cell0, 64gb memory interleaved from cell0 & cell1), dom0 boots
> eventually, but produces multiple Timer errors as shown below. I tried
> setting numa=on but timer errors persist. FYI Xen unstable cs 17318 ran
> successfully without timer errors on this multi-cell configuration.
> 
> Timer ISR/0: Time went backwards: delta=-2679966594 delta_cpu=10033406
> shadow=13664567457 off=530033587 processed=16874567457
> cpu_processed=14184567457
> 0: 14184567457
> 1: 16874567457
> 2: 16874567457
> 3: 16874567457
> 4: 16874567457
> 5: 16874567457
> 6: 16874567457
> 7: 16874567457
> 
> The attached serial trace shows a boot with 32gb and then a boot with
> 64gb. 
> 

Is the system using the pm timer? You may try clocksource=pit,
or keeping more memory in the Hypervisor (via xenheap or dom0_mem)
as workarounds.

 Bill

> brian carb
> unisys corporation - malvern, pa
> 
>  
> 
> 
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