On official web site said:
In progress:
* Paravirtualized networking
* Paravirtualized block device
Where can find sources of that work, if it is possible ?
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Omar Khan wrote:
> hi,
>What is the status of paravirtualization?
It's basically stalled.
However, I'd like to restart this, on a much bigger scale. Using
paravirt_ops, one can use direct paging (like Xen) instead of shadow
paging, and achieve better performance. In fact, it should be fa
hi,
What is the status of paravirtualization? Also when Ingo released his
paravirtualization patch and some results Avi noted that :
"Very impressive! The gain probably comes not only from avoiding the
vmentry/vmexit, but also from avoiding the flushing of the global page
tlb entries." [htt
>> >Why so many vm switches? First up, a typical I/O system maxes at
>> >about 1Gb/s, right? That would be a gigabit NIC, or striped RAID,
or
>> >something like that. This suggests an average of only about 300
>> >bytes/transfer, to get >150k individual transfers per second? I
>> >thought block
>
> "This utilizes the cr3 filter capability of the hardware - if this works out
> then no VM exit happens"
>
> NO VM-exits happen. h... maybe I need to go over the intel manuals more
> thoroughly, however any hints will be most welcomed.
Hi,
I think you're confused a bit ;)
the cr3 filt
Omar Khan wrote:
> Dor Laor <[EMAIL PROTECTED]> writes:
>
>
>
>> Theoretically speaking the answer is yes, vmcall is a special
>> instruction that it one and only purpose is the exit from the guest.
>> While mov cr3 instruction might be bound to other actions of the
>> processor and might have m
Dor Laor <[EMAIL PROTECTED]> writes:
>
> Theoretically speaking the answer is yes, vmcall is a special
> instruction that it one and only purpose is the exit from the guest.
> While mov cr3 instruction might be bound to other actions of the
> processor and might have more effects on the pipeline
>> The hypercall sequence does not avoid a vmexit. The guest issues a
>> vmcall instruction, which is trapped and processed by the host.
>>
>
>Thanks for replying Avi. In your response
> (http://article.gmane.org/gmane.linux.kernel/481457) to the
announcement
>of the
> KVM paravirtualization patch
Avi Kivity <[EMAIL PROTECTED]> writes:
> The hypercall sequence does not avoid a vmexit. The guest issues a
> vmcall instruction, which is trapped and processed by the host.
>
Thanks for replying Avi. In your response
(http://article.gmane.org/gmane.linux.kernel/481457) to the announcement o
Omar Khan wrote:
> hi,
>
>I have a couple of kvm/kernel newbie questions:
>
>1. What is the sequence of events for a paravirtualization hypercall? I
> understand how VMX architecture works, but how does the paravirt fit in? When
> we
> make a paravirt sys call we avoid a VMexit, but which
hi,
I have a couple of kvm/kernel newbie questions:
1. What is the sequence of events for a paravirtualization hypercall? I
understand how VMX architecture works, but how does the paravirt fit in? When we
make a paravirt sys call we avoid a VMexit, but which address space does the
call go t
> >Why so many vm switches? First up, a typical I/O system maxes at
> >about 1Gb/s, right? That would be a gigabit NIC, or striped RAID, or
> >something like that. This suggests an average of only about 300
> >bytes/transfer, to get >150k individual transfers per second? I
> >thought block I/O
> Great news.
> Expecting to see the patch soon.
there's still a wart or two on the host side but it's getting ready
quickly.. give me a few days ;)
> Do you base your code over the kernel's paravirt_ops and Ingo's KVM
> hypercall?
I'm using Ingo's KVM hypercall yes; I don't need paravirt_ops
>
>> Second, we currently use Qemu's device emulation were the ne2k device
>> does dozens of IO accesses per packet! The rtl8139 is better and does
>> about 3 IO(MMIO) per packet. The current maximum throughput using the
>
>and this is where paravirtualized device drivers can help, like Ingo's
>net
> Second, we currently use Qemu's device emulation were the ne2k device
> does dozens of IO accesses per packet! The rtl8139 is better and does
> about 3 IO(MMIO) per packet. The current maximum throughput using the
and this is where paravirtualized device drivers can help, like Ingo's
network dr
>> > Intel is indeed slower than AMD with this one.
>> > I didn't measure such roundtrip specifically. We usually see that
the
>> > VMETNRY/VMEXIT cycle limits our performance (for io/mmio,..)
>> > On Intel core duo we cannot get more than 150k-200k VMEXITS per
second
>> > for regular guest doin
> > Intel is indeed slower than AMD with this one.
> > I didn't measure such roundtrip specifically. We usually see that the
> > VMETNRY/VMEXIT cycle limits our performance (for io/mmio,..)
> > On Intel core duo we cannot get more than 150k-200k VMEXITS per second
> > for regular guest doing extens
On 2/12/07, Omar Khan <[EMAIL PROTECTED]> wrote:
> The paravirtualization announcement by Ingo Molnar said that:
>
> - it provides an ad-hoc paravirtualization hypercall API between a Linux
> guest and a Linux host. (this will be replaced with a proper
> hypercall later on.)
>
> Is it possible
>>> On Mon, Feb 12, 2007 at 9:23 AM, in message
<[EMAIL PROTECTED]>,
"Dor Laor" <[EMAIL PROTECTED]> wrote:
>
> Thanks man, my mistake, I meant microsecond when wrote the 'ms'.
FYI: The SI symbol for micro is the greek lower-case letter Mu. However, since
that would be a pain in ASCII, the le
>On Mon, Feb 12, 2007 at 05:21:26AM -0800, Dor Laor wrote:
>> >>
>> >> >hi,
>> >> >Can someone briefly explain what the cr3-cache feature on
intel
>> VT
>> >> >processors is and how it is used to improve performance in
>> >> >paravirtualization.
>> >>
>> >> In short, this is a unique Intel VT f
On Mon, Feb 12, 2007 at 05:21:26AM -0800, Dor Laor wrote:
> >>
> >> >hi,
> >> >Can someone briefly explain what the cr3-cache feature on intel
> VT
> >> >processors is and how it is used to improve performance in
> >> >paravirtualization.
> >>
> >> In short, this is a unique Intel VT feature th
>>
>> >hi,
>> >Can someone briefly explain what the cr3-cache feature on intel
VT
>> >processors is and how it is used to improve performance in
>> >paravirtualization.
>>
>> In short, this is a unique Intel VT feature that supposed to save
vmexit
>> on cr3 switch. The vmexit operation is quite
On Sat, Feb 10, 2007 at 02:22:25PM -0800, Dor Laor wrote:
>
> >hi,
> >Can someone briefly explain what the cr3-cache feature on intel VT
> >processors is and how it is used to improve performance in
> >paravirtualization.
>
> In short, this is a unique Intel VT feature that supposed to save v
The paravirtualization announcement by Ingo Molnar said that:
- it provides an ad-hoc paravirtualization hypercall API between a Linux
guest and a Linux host. (this will be replaced with a proper
hypercall later on.)
Is it possible to modify a non-linux guest to take advantage of this hyperc
Thanks Dor.
Omar
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>hi,
>Can someone briefly explain what the cr3-cache feature on intel VT
>processors is and how it is used to improve performance in
>paravirtualization.
In short, this is a unique Intel VT feature that supposed to save vmexit
on cr3 switch. The vmexit operation is quite expensive at the mome
hi,
Can someone briefly explain what the cr3-cache feature on intel VT
processors is and how it is used to improve performance in paravirtualization.
Thanks
Omar
-
Using Tomcat but need to do more? Need to support we
[EMAIL PROTECTED] wrote:
> hi,
>
>Is there any documentation/information on the paravirtualization hypercall
> API for the KVM paravirtualization for Linux announced by Ingo Molnar?
>
>
It's documented in the source, which will be merged in a couple of days.
--
Do not meddle in the inte
hi,
Is there any documentation/information on the paravirtualization hypercall
API for the KVM paravirtualization for Linux announced by Ingo Molnar?
Omar Khan
-
Using Tomcat but need to do more? Need to support web serv
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