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xen-devel
Re: [Xen-devel] PV drivers for HVM guests
Andrew,
The I/O performance of HVM guests with PV drivers is SIGNIFICANTLY better than
what we get without PV drivers. I will post the patches after some additional
testing and code cleanup.
Regards,
K. Y
>>> On Tue, Oct 3, 2006 at 6:19 PM, in message
<1159913996.27206.37.camel@localhost>, "Andrew D. Ball" <aball@xxxxxxxxxx>
wrote:
> Interesting! Ideally, there would be better performance in the base HVM
> device model. I think I know of some people that are working hard on
> that.
>
> I'm curious to see what you've done for (1) and (2).
>
> Peace.
> Andrew
>
> On Tue, 2006- 10- 03 at 16:31 - 0400, Ky Srinivasan wrote:
>> I am trying to build PV drivers for SLES9 HVM guests. SLES 9 is based on the
> 2.6.5 kernel. Since the PV driver code is really designed for the latest
> kernel release, I have had many issues/problems in building the PV drivers
> for older Linux OS targets - I have only been looking at the issues with
> 2.6.5
> kernel base and I suspect the problem will be even worse if one were to look
> at older Linux kernels. This is unfortunate since PV drivers are so critical
> for HVM guests and there is considerable interest in supporting legacy Linux
> environments as HVM guests. The problems I have had to deal with can be
> broadly classified into:
>>
>> a) Compiler related issues
>> b) Missing functionality in the legacy kernel - this includes features as
> well as changed data structures
>> c) Implementation differences of a given feature
>>
>> These differences can be dealt with in a couple of different ways:
>> 1) Modify the code in the PV drivers under appropriate compilation switches
> to deal with the differences in the base kernels.
>> 2) Introduce a compatibility component that bridges the gap between the
> current PV code and a given Linux target and leave much of the PV driver
> code untouched.
>>
>> I have implemented both these schemes for the sles9 kernel and would like to
> get your input on your preference. I personally like option 2. Going forward,
> the evolution of PV drivers needs to be constrained by the required support
> for legacy Linux environments.
>>
>> Regards,
>>
>> K. Y. Srinivasan
>>
>>
>>
>>
>>
>> _______________________________________________
>> Xen- devel mailing list
>> Xen- devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen- devel
>
>
> _______________________________________________
> Xen- devel mailing list
> Xen- devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen- devel
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