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[Qemu-devel] Performance difference between QEMU 2.2.0 and 2.6.0

From: Wenwen Wang
Subject: [Qemu-devel] Performance difference between QEMU 2.2.0 and 2.6.0
Date: Wed, 8 Mar 2017 11:17:50 -0600

Hello all,

I just found that there is a significant performance difference between
QEMU version 2.2.0 and 2.6.0.

Here are the execution times of the benchmark 458.sjeng from SPEC CINT2006
with test workload using user only emulation from ARM guest to x86-32 host:

qemu-2.2.0: 29 seconds
qemu-2.6.0: 38 seconds

I am sure that the evaluation environments are the same in the two

I also evaluated other benchmarks, it seems that they also have some
performance differences.

Could anyone tell me what this difference comes from or give me any hint?

Many thanks in advance!


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