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[Xen-devel] another scheduler problem, on x86_64 only?

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] another scheduler problem, on x86_64 only?
From: Andrew Theurer <habanero@xxxxxxxxxx>
Date: Tue, 12 Jul 2005 16:22:14 -0500
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I Noticed that dom0 is only getting about 50% cpu after seeing about 1/2 
the performance on some benchmarks, xen0 vs baremetal.  I just ran a 
quick cpu bound script:

while [ 1 ]; do x=1; done&

..and I get this cpu util:

        total   domains
        ------- ----------
 cpu0:  [050.7] d0-0[050.7]
 cpu0:  [049.8] d0-0[049.8]
 cpu0:  [049.8] d0-0[049.8]
 cpu0:  [049.8] d0-0[049.8]

Anyone else seen this on x86_64 dom0 with BVT? 

I do not see this in i386 with BVT.

[root@e326-1 src]# xm dmesg | grep sched
(XEN) Using scheduler: Borrowed Virtual Time (bvt)

[root@e326-1 src]# xm dmesg | grep -i changeset
 Latest ChangeSet: Tue Jul 12 08:19:10 2005 


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