Re: [Xen-devel] performance save/restore under xen-4.3.2 compared to kvm/qemu

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.08.14 at 14:38, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 25/08/14 13:35, Jan Beulich wrote:
>>>>> On 25.08.14 at 14:23, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> I have also identified a bottleneck in the Linux PVOps kernel where the
>>> mmap batch ioctl takes a batch size of 1024 and generates 1024 batch
>>> hypercalls of batch size 1.  Fixing this will certainly make the
>>> mapping/unmapping faster.
>> Didn't Mats Petersson post a patch for this quite a while ago? Did
>> this perhaps never get applied?
> 
> That was a different issue if I remember correctly.  I think it was to
> do with the classic kernel using ioremap() for foreign domain memory.

I certainly remember that patch having been against pv-ops...

Jan


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