[Bug 216760] poor performance on QEMU-KVM host

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216760

--- Comment #4 from rainer at ultra-secure.de ---
Oh, I've never tried that.


(freebsd11 </root>) 0 # dc3dd wipe=/dev/md0 

dc3dd 7.2.641 started at 2017-02-06 12:37:44 +0100
compiled options:
command line: dc3dd wipe=/dev/md0
device size: 8388608 sectors (probed),    4,294,967,296 bytes
sector size: 512 bytes (probed)
  4294967296 bytes ( 4 G ) copied ( 100% ),    8 s, 507 M/s                   

input results for pattern `00':
   8388608 sectors in

output results for device `/dev/md0':
   8388608 sectors out

dc3dd completed at 2017-02-06 12:37:52 +0100


You're right, memory performance is still sufficient on XenServer.


This is real hardware:

root at bsd1-build-prod:~ # dc3dd wipe=/dev/md0

dc3dd 7.2.641 started at 2017-02-06 12:40:58 +0100
compiled options:
command line: dc3dd wipe=/dev/md0
device size: 8388608 sectors (probed),    4,294,967,296 bytes
sector size: 512 bytes (probed)
  4294967296 bytes ( 4 G ) copied ( 100% ),    6 s, 656 M/s                   

input results for pattern `00':
   8388608 sectors in

output results for device `/dev/md0':
   8388608 sectors out

dc3dd completed at 2017-02-06 12:41:04 +0100

Though one generation later, so faster RAM, faster CPUs.

I'd be happy with that kind of disk-performance loss in a DomU :-(

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