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From: Vivek Khera <vivek@khera.org>
Date: Tue, 10 Oct 2006 14:44:47 -0400
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Subject: Re: gmirror warnings
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On Oct 10, 2006, at 2:11 PM, Mike Jakubik wrote:

>>   Those messages are not directly related to gmirror, they come  
>> from the ATA
>> driver when it can't allocate memory for the structure which  
>> describes
>> I/O request:
>
> I think this behavior is limited to the amd64 architecture, or at  
> least more prone to occur. I have a number of identical servers,  
> and only one of them runs in amd64 mode. This server displays these  
> errors every now and then, while the others don't. While the server  
> continues to function properly, its still annoying seeing these.  
> Perhaps there is a auto tuning problem on amd64?

I have six identical boxes all built at the same time.  This is the  
only one reporting this error.  All run identical copies of freebsd.

I also have at least 2 other boxes with SATA drives running amd64 and  
none shows the error.

It is obviously related to workload.