Xen users - Jun 2010 - performance breakdown with Xen 3.4.3 or 4.0.0 and xenified kernel 2.6.31-r14

Hello,

I regularly perform benchmarks of Xen/KVM systems. When Xen 3.4.3 was released I
started another benchmark and found out that the xenified kernel 2.6.31-r14 from
Andrew Lyon had serious performance breakdowns when used with Xen 3.4.3 or Xen
4.0.0 but not with Xen 3.4.2. The benchmark measures compiling apache 2.2.15
under gentoo.

What could be the reason?

date: 02.06.2010
time emerge apache 2.2.15

native 2.6.31.12-ak2
	real    0m40.736s
	user    0m41.479s
	sys     0m9.701s

2.6.31-xen0-r14-ak1 + xen 3.4.2
	real    0m54.751s
	user    0m41.839s
	sys     0m18.721s

git 2.6.32.14-pvops0 (02.06.2010) + xen 4.0.0
git 2.6.32.14-pvops0 (02.06.2010) + xen 3.4.2
git 2.6.32.14-pvops0 (02.06.2010) + xen 3.4.3
	real    0m57.769s
	user    0m44.967s
	sys     0m29.034s

2.6.31-xen0-r14-ak1 + xen 3.4.3
2.6.31-xen0-r14-ak1 + xen 4.0.0
	real    1m8.681s
	user    0m42.107s
	sys     0m26.858s

Regards Andreas


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