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

[Tim Kaufmann <tim@xxxxxxxxxxxxxx>]

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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