Hello,
I run a home server :
Quad Core Q6600 + 8GB mem
SATA disks AHCI mode
XVM Dom0 SXCE build 113
Now i have a paravirtualized GentooLinux Server running on a zvol (15G)
created on a zpool (1 only disk , 500G) , ext3fs, kernel xen-sources-2.6.18
I tried a very simple test on the dom0 and the domU (same disk
underlying) and the results surprise me a lot :
Dom0
amber ~ # uname -a
SunOS amber 5.11 snv_113 i86pc i386 i86xpv
amber ~ # isainfo
amd64 i386
amber ~ # /usr/gnu/bin/dd if=/dev/zero of=/tank/test count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB) copied, 2.70782 s, 18.9 MB/s
DomU :
corwin bruno # uname -a
Linux corwin 2.6.18-xen-r12 #7 SMP Fri May 8 10:41:05 CEST 2009 x86_64
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz GenuineIntel GNU/Linux
corwin bruno # dd if=/dev/zero of=/home/bruno/test count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB) copied, 0.504987 s, 101 MB/s
Now that is a 1 to 5 performance gap !!
Any ideas about how to explain this ?
Bruno
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