RE: [Xen-users] Re: Xen domU physical partition disk I/O write throughput %50 slower

["Hills, Steve" <Steve.Hills@xxxxxxxxxxxx>]

Note: the bonnie run was from a different time than the dd run but the
difference is still 40%-50%.

----- From dom0 (2G mem)

bonnie -s 4096
Bonnie 1.4: File './Bonnie.14020', size: 4294967296, volumes: 1
Writing with putc()...         done:  63109 kB/s 160.1 %CPU
Rewriting...                   done:  34731 kB/s   4.0 %CPU
Writing intelligently...       done:  91248 kB/s  10.6 %CPU
Reading with getc()...         done:  58771 kB/s 105.3 %CPU
Reading intelligently...       done: 100379 kB/s   4.5 %CPU

time dd if=/dev/zero of=test bs=1K count=1048576 conv=fdatasync
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB) copied, 16.9593 s, 63.3 MB/s

real    0m17.162s
user    0m0.356s
sys     0m4.344s


----- From domU (2G mem)

bonnie -s 4096
Bonnie 1.4: File './Bonnie.2089', size: 4294967296, volumes: 1
Writing with putc()...         done:  47753 kB/s  57.6 %CPU
Rewriting...                   done:  25996 kB/s   2.8 %CPU
Writing intelligently...       done:  50126 kB/s   7.3 %CPU
Reading with getc()...         done:  69383 kB/s  70.4 %CPU
Reading intelligently...       done: 101596 kB/s   5.0 %CPU

time dd if=/dev/zero of=test bs=1K count=1048576 conv=fdatasync
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB) copied, 26.6137 s, 41.9 MB/s

real    0m25.741s
user    0m0.512s
sys     0m6.500s


Steve Hills
Teradata Corporation
steve.hills@xxxxxxxxxxxx

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of khris4
Sent: Tuesday, September 28, 2010 8:25 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: Xen domU physical partition disk I/O write
throughput %50 slower


Can you provide us with some statistics. 
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