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Re: [Qemu-devel] Enabling Hyperthreading for Guest

From: Erik Rull
Subject: Re: [Qemu-devel] Enabling Hyperthreading for Guest
Date: Thu, 22 Sep 2011 18:43:04 +0200
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20110902 Firefox/6.0.2 SeaMonkey/2.3.3

Alex Williamson wrote:
See the extended -smp options:

-smp n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets]
                 set the number of CPUs to 'n' [default=1]
                 maxcpus= maximum number of total cpus, including
                 offline CPUs for hotplug, etc
                 cores= number of CPU cores on one socket
                 threads= number of threads on one CPU core
                 sockets= number of discrete sockets in the system

Try something like:

-smp 4,cores=2,threads=2,sockets=1


Great - the correct combination made it :-)

But the SMP-Performance-Benchmark is horrible :-(
"Only" between 0.35 and 1.05 for the above combination.
I have the same architecture on the host (2 cores w/ ht enabled) so there are enough real cores available for computation.

Any idea what could slow down the performance here?

Best regards,


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