Sp_who2 shows cpu=2147483647

Question

Wassup with this?  Just started a big insert statement, server with four cores, sp_who2 shows 25 lines for spid #61, ok I have a parallel plan, but 24 of the lines shows cpu=2147483647.
This is on version:
Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64)
Mar 29 2009 10:11:52
Copyright (c) 1988-2008 Microsoft Corporation
Enterprise Edition (64-bit) on Windows NT 5.2 <X64> (Build 3790: Service Pack 2)
only unusual thing I can think of is the database is still in compatability mode 90 (SQL2005), not sure why.
Activity monitor never showed the CPU as above about 40%.
Thanx.
Josh

Answer 1

I remember SQL 2005 having an issue where if it has been running for a while, the internal counters it uses (specifically, @@CPU_BUSY) to measure CPU utilization accumulate to the point where SQL gets a value larger than what it's expecting. 
This would cause SQL to display CPU metrics incorrectly.
I am not sure if it affects SQL 2008 though.  I also am not sure if it would affect sp_who2.  Right now I'm just throwing out a possibility.
Here is some documentation that describes it in further detail
http://technet.microsoft.com/en-us/library/ms186925.aspx 
Hmm, that's ... interesting!
The first line in sp_who2 output for the spid, showed a reasonable number.
If it persists, I will try bouncing the server.  Thanks.
Josh