On 10/07/2009 09:31 PM, Matthew Tippett wrote:
The benchmark used was the sqlite subtest in the phoronix test suite.
My awareness and involvement is beyond "reading a magazine article", I
can elaborate if needed, but I don't believe it is necessary.
Process for reproduction, assuming Karmic,
# apt-get install phoronix-test-suite
$ phoronix-test-suite benchmark sqlite
Answer the questions (test-names, etc, etc), it will download sqlite,
build it and execute the test. By default the test runs three
timesand averages the results. The results experienced should be
similar to the values identified at
http://www.phoronix.com/scan.php?page=article&item=linux_2631_kvm&num=3
Which is approximately 12 minutes for the native, and about 60 seconds
for the guest.
Given that the performance under the guest is expected to be around 60
seconds, I would suggest confirming performance there first.
What is the data set for this benchmark? If it's much larger than guest
RAM, but smaller than host RAM, you could be seeing the effects of read
caching.
Another possiblity is barriers and flushing.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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