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Re: [Xen-users] Is LVM really that much slower than Container?

With the help of Tom Brown, I've started over benchmarking dom0 and domU2 for more realistic results. Correct me if I'm wrong, Tom, but what you recommended was using a larger testfile (twice the size of the RAM) and adding "conv=fsync" to the dd-command to get rid of caching effects.

dom0
====
dd if=/dev/zero of=./test16384M bs=1024k count=16384 conv=fsync
16384+0 records in
16384+0 records out
17179869184 bytes (17 GB) copied, 82,1605 s, 209 MB/s

time (cp test16384M test16384M2;sync)
real    3m8.108s
user    0m0.660s
sys     0m20.790s


domU2
=====
dd if=/dev/zero of=./test1024M bs=1024k count=1024 conv=fsync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 184.295 s, 5,8 MB/s

time (cp test1024M test1024M2;sync)
real    3m11.915s  (testfile is only 1/16 the size of testfile for dom0!)
user    0m0.100s
sys     0m2.723s

Tim




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