On Tue, 6 Oct 2015, Roger Pau Monné wrote:
> Do KVM guests also need such extensive set of modifications in order to
> run using 64KB pages? I know it's not fair to compare KVM and Xen in
> this regard, because the interfaces are very different, but that's what
> developers are going to look at.
Q
On Tue, 2015-10-06 at 11:28 +0200, Roger Pau Monné wrote:
> El 22/09/15 a les 12.59, Ian Campbell ha escrit:
> > On Mon, 2015-09-14 at 17:23 +0200, Roger Pau Monné wrote:
> > > I'm not saying that we shouldn't take those patches, I'm just saying
> > > that IMHO this is a workaround, and I would lik
El 22/09/15 a les 12.59, Ian Campbell ha escrit:
> On Mon, 2015-09-14 at 17:23 +0200, Roger Pau Monné wrote:
>> I'm not saying that we shouldn't take those patches, I'm just saying
>> that IMHO this is a workaround, and I would like to see a plan and
>> somebody committed to have it fixed in a prop
On 29/09/15 17:33, Julien Grall wrote:
> Hi David,
>
> On 29/09/15 17:27, David Vrabel wrote:
>> On 07/09/15 16:33, Julien Grall wrote:
>>>
>>> A branch based on the latest xentip/for-linus-4.3 can be found here:
>>>
>>> git://xenbits.xen.org/people/julieng/linux-arm.git branch xen-64k-v4
>>
>> Th
Hi David,
On 29/09/15 17:27, David Vrabel wrote:
> On 07/09/15 16:33, Julien Grall wrote:
>>
>> A branch based on the latest xentip/for-linus-4.3 can be found here:
>>
>> git://xenbits.xen.org/people/julieng/linux-arm.git branch xen-64k-v4
>
> This has too many conflicts with the
> git://git.kern
On 07/09/15 16:33, Julien Grall wrote:
>
> A branch based on the latest xentip/for-linus-4.3 can be found here:
>
> git://xenbits.xen.org/people/julieng/linux-arm.git branch xen-64k-v4
This has too many conflicts with the
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git for-linus-4.4
br
On Mon, 2015-09-14 at 17:23 +0200, Roger Pau Monné wrote:
> I'm not saying that we shouldn't take those patches, I'm just saying
> that IMHO this is a workaround, and I would like to see a plan and
> somebody committed to have it fixed in a proper way, by introducing a
> 64KB PV block protocol.
In
Hi Roger,
On 14/09/15 13:08, Roger Pau Monné wrote:
> Well, absolute numbers together with the standard deviation are IMHO the
> best way to provide those figures (ie: see ministat(1) output for
> example), but percentages should also be fine.
>
> I'm just interested in knowing the performance di
On Tuesday 15 September 2015 14:14:09 David Vrabel wrote:
> On 14/09/15 12:32, Arnd Bergmann wrote:
> > On Monday 14 September 2015 13:04:59 Roger Pau Monné wrote:
> >>> TBH, I'm expecting a small impact to the performance. It would be hard
> >>> to get the exactly the same performance as today if
On 14/09/15 12:32, Arnd Bergmann wrote:
> On Monday 14 September 2015 13:04:59 Roger Pau Monné wrote:
>>> TBH, I'm expecting a small impact to the performance. It would be hard
>>> to get the exactly the same performance as today if we keep the helpers
>>> to avoid the backend dealing himself with
El 14/09/15 a les 16.54, Stefano Stabellini ha escrit:
> On Mon, 14 Sep 2015, Roger Pau Monné wrote:
>> IMHO this splitting is just a workaround for the fact that we don't have
>> a 64KB PV block protocol, and this is the real problem that should be
>> solved.
>
> 64K is a pure one guest kernel co
On Mon, 14 Sep 2015, Roger Pau Monné wrote:
> IMHO this splitting is just a workaround for the fact that we don't have
> a 64KB PV block protocol, and this is the real problem that should be
> solved.
64K is a pure one guest kernel configuration option, not a platform wide
option. The hypervisor i
On 14/09/15 15:29, Roger Pau Monné wrote:
>> To give you an example, Centos 7, which will support Xen and only 64KB
>> page granularity, will be supported for years. Dropping any splitting in
>> a short future (3-5 years) will just break those guests to boot on Xen.
>
> Can't the patches to suppor
Hello,
El 14/09/15 a les 14.47, Julien Grall ha escrit:
> On 14/09/15 13:08, Roger Pau Monné wrote:
>>> I'd like to see a basic support of 64KB page granularity upstream before
>>> starting to think about performance improvement. And there is still a
>>> lot to do.
>>
>> I wasn't actually thinking
On 14/09/15 13:08, Roger Pau Monné wrote:
>> I'd like to see a basic support of 64KB page granularity upstream before
>> starting to think about performance improvement. And there is still a
>> lot to do.
>
> I wasn't actually thinking of this as a performance improvement, but
> rather as a way of
El 14/09/15 a les 13.21, Julien Grall ha escrit:
> On 14/09/15 12:04, Roger Pau Monné wrote:
>> Hello,
>>
>> El 14/09/15 a les 12.40, Julien Grall ha escrit:
>>> Hi Roger,
>>>
>>> On 14/09/15 09:56, Roger Pau Monné wrote:
El 07/09/15 a les 17.33, Julien Grall ha escrit:
> Hi all,
>
>>>
On Monday 14 September 2015 13:04:59 Roger Pau Monné wrote:
> > TBH, I'm expecting a small impact to the performance. It would be hard
> > to get the exactly the same performance as today if we keep the helpers
> > to avoid the backend dealing himself with the splitting and page
> > granularity.
>
On 14/09/15 12:04, Roger Pau Monné wrote:
> Hello,
>
> El 14/09/15 a les 12.40, Julien Grall ha escrit:
>> Hi Roger,
>>
>> On 14/09/15 09:56, Roger Pau Monné wrote:
>>> El 07/09/15 a les 17.33, Julien Grall ha escrit:
Hi all,
ARM64 Linux is supporting both 4KB and 64KB page granular
Hello,
El 14/09/15 a les 12.40, Julien Grall ha escrit:
> Hi Roger,
>
> On 14/09/15 09:56, Roger Pau Monné wrote:
>> El 07/09/15 a les 17.33, Julien Grall ha escrit:
>>> Hi all,
>>>
>>> ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
>>> hypercall interface and PV prot
Hi Roger,
On 14/09/15 09:56, Roger Pau Monné wrote:
> El 07/09/15 a les 17.33, Julien Grall ha escrit:
>> Hi all,
>>
>> ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
>> hypercall interface and PV protocol are always based on 4KB page granularity.
>>
>> Any attempt to
El 07/09/15 a les 17.33, Julien Grall ha escrit:
> Hi all,
>
> ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
> hypercall interface and PV protocol are always based on 4KB page granularity.
>
> Any attempt to boot a Linux guest with 64KB pages enabled will result to a
Hi,
A quick update on the TODO.
On 07/09/15 16:33, Julien Grall wrote:
> ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
> hypercall interface and PV protocol are always based on 4KB page granularity.
>
> Any attempt to boot a Linux guest with 64KB pages enabled will
Hi all,
ARM64 Linux is supporting both 4KB and 64KB page granularity. Although, Xen
hypercall interface and PV protocol are always based on 4KB page granularity.
Any attempt to boot a Linux guest with 64KB pages enabled will result to a
guest crash.
This series is a first attempt to allow those
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