RE: Anyone every seen a VM image run in slow motion?
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <post.ethan@xxxxxxxxx>, "'oracle-l'" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 30 Sep 2009 18:12:59 -0400
On Oracle VM I've seen fully virtualized machines look like they are nearly
completely stopped when mixed with para-virtualized machines that are doing
enough to consume the physical CPUs. The fully virtualized machines use up
all their time doing device emulation, so one i/o, and bang you're out of
there for a long time. Simply not mixing cures that particular problem. And
it's not clear to me when it might be worthwhile to be fully virtualized in
practice, but I'm only a dabbler in VM.
I have no idea whether this corresponds with anything in VMware or whether
you were in competition with other VM's for resources in your example.
Regards,
mwf
_____
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Ethan Post
Sent: Tuesday, September 29, 2009 10:14 PM
To: oracle-l
Subject: Anyone every seen a VM image run in slow motion?
Look at my watch...9:11 pm exactly.
hit return on "sleep 60"...
wait until it comes back, date on server says it took 60 seconds...
Look at my watch...now 9:12 and 14 seconds...huh, never seen that before.
This is VM ware by the way, Linux.
Just wondering if anyone here has seen anything like this. Hard one to
Google as I can figure out exactly what terms I would use.
Thanks,
Ethan
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