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Hi list, I''ve read about recent efforts to push pv-on-hvm drivers to Linux mainline and I''m curious to know the cause for this. What''s the advantage over using pv_ops directly and booting the kernel paravirtualized? Are there plans to move Linux domUs closer to the KVM way (from an architectural point of view)? Hope you can help. Regards, Markus

Hi *, i am coming from UML, and now i evaluate Xen on my desktop: Xen-2.0.4 linux-2.6.10 "CONFIG_MODULES is not set" "CONFIG_AGP is not set" "CONFIG_FB_RADEON=y" FC3, [/usr]/lib/tls moved away It works, but some desktop applications crash once in a while within dom0: metacity-2.8.6 firefox-1.0.1 wnck-applet (from gnome-panel-2.8.1) But

This command enables/disables the command replies. It is useful when the introspection tool send multiple messages with one write() call and doesn't have to wait for a reply. IIRC, the speed improvment seen during UnixBench tests in a VM introspected through vsock (the introspection tool was running in a different VM) was around 5-10%. Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com> --- Documentation/virtual/kvm/kvmi.rst | 50 ++++++++++++++++++++++++++ include/uapi/linux/kvmi.h | 7 ++++ v...

On Fri, Jun 03, 2016 at 02:33:47PM +1000, Benjamin Herrenschmidt wrote: > ?- For the above, can you show (or describe) where the qspinlock > ? ?improves things compared to our current locks. So currently PPC has a fairly straight forward test-and-set spinlock IIRC. You have this because LPAR/virt muck and lock holder preemption issues etc.. qspinlock is 1) a fair lock (like ticket locks)

On Fri, Jun 03, 2016 at 02:33:47PM +1000, Benjamin Herrenschmidt wrote: > ?- For the above, can you show (or describe) where the qspinlock > ? ?improves things compared to our current locks. So currently PPC has a fairly straight forward test-and-set spinlock IIRC. You have this because LPAR/virt muck and lock holder preemption issues etc.. qspinlock is 1) a fair lock (like ticket locks)

Based on some tests we ran, it seems the biggest performance hit you get from running within domU is from disk I/O. We did some mysql read and write tests, and for both, our performance is about half that compared to native. Has that been others'' experience? Is there any way to make this better? We are using physical partitions. In contrast, cpu/memory tests appear to be near

...le than comparable Intel hardware would be (comparable, again, being a PII 400+ with 256-384MB RAM, an Adaptec 2940UW, and 8GB Seagate UW drives: I know this because I have benchmarked another of our servers here that is a dual 400MHz PII with those drives and came up with comparable numbers (using UnixBench 4.1, which benchmarks quite a few areas)). Those U30s are built like tanks; they also take approximately the same amount of power as the dual 400 does; about 100 watts. Now, if you're going to compare the E4500 to Intel hardware, you need to look at high-end Proliants and PowerEdges of that t...

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place