Re: [Xen-devel] HYBRID: PV in HVM container

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Mon, 27 Jun 2011 12:24:04 -0700
Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:

> 
> Hi guys,
> 
> Cheers!! I got PV in HVM container prototype working with single VCPU
> (pinned to a cpu). Basically, I create a VMX container just like for
> HVM guest (with some differences that I'll share soon when I clean up
> the code). The PV guest starts in Protected mode with the usual
> entry point startup_xen().
> 
> 0. Guest kernel runs in ring 0, CS:0x10.


JFYI.. as expected, running in ring 0 and not bouncing syscalls thru
xen, syscalls do very well. fork/execs are slow prob beause VPIDs are 
turned off right now. I'm trying to figure VPIDs out, and hopefully that
would help. BTW, dont' compare to anything else, both kernels
below are unoptimized debug kernels.

LMbench:
Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
Host                 OS  Mhz null null      open selct sig  sig  fork exec sh
                             call  I/O stat clos TCP   inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
STOCK     Linux 2.6.39+ 2771 0.68 0.91 2.13 4.45 4.251 0.82 3.87 433. 1134 3145
HYBRID    Linux 2.6.39m 2745 0.13 0.22 0.88 2.04 3.287 0.28 1.11 526. 1393 3923


thanks,
Mukesh




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