Re: [Xen-devel] RT-Xen on ARM

Hi Andrii, I'm sorry for replying to this thread late. I was busy with a paper deadline until last Saturday morning. I saw Dario's thorough answer which explains the high-level idea of the real-time analysis that is the theoretical foundation of the analysis tool, e.g., CARTs. Hopefully, he

Re: [Xen-devel] RT-Xen on ARM

Hello Dario, On 28.09.17 19:01, Dario Faggioli wrote: On Thu, 2017-09-28 at 12:18 +0300, Andrii Anisov wrote: - Could you please provide an example input xml for CARTS described a system with 2 RT domains with 2 VCPUs each, running on a 2PCPUs, with gEDF scheduling at VMM level (for XEN

Re: [Xen-devel] RT-Xen on ARM

On Thu, 2017-09-28 at 18:01 +0200, Dario Faggioli wrote: > On Thu, 2017-09-28 at 12:18 +0300, Andrii Anisov wrote: > > > > > The GP scheduler --like Credit1 or Credit2, if you are on Xen-- will > give you fairness, but without any precise temporal guarantee. This > means that, in this case, each

Re: [Xen-devel] RT-Xen on ARM

On Thu, 2017-09-28 at 12:18 +0300, Andrii Anisov wrote: > > >  - Could you please provide an example input xml for CARTS > > > described a > > > system with 2 RT domains with 2 VCPUs each, running on a 2PCPUs, > > > with gEDF > > > scheduling at VMM level (for XEN based setup). > > > > Hmm,

Re: [Xen-devel] RT-Xen on ARM

Hello, On 27.09.17 22:57, Meng Xu wrote: Note that: When you use gEDF scheduler in VM or VMM (i.e., Xen), you should use MPR2 model I guess you mean DMPR in CARTS terms. to compute the resource interface (i.e., VCPU parameters). When you use pEDF scheduler, you should use PRM model to

Re: [Xen-devel] RT-Xen on ARM

On Wed, Sep 27, 2017 at 10:37 AM, Andrii Anisov wrote: > Hello, > > > On 27.09.17 16:57, Meng Xu wrote: >> >> The command is: >> java -jar carts.jar inputfile outputfile > > From the next example, I would say the command is: > java -jar carts.jar inputfile

Re: [Xen-devel] RT-Xen on ARM

Hello, On 27.09.17 16:57, Meng Xu wrote: The command is: java -jar carts.jar inputfile outputfile From the next example, I would say the command is: java -jar carts.jar inputfile interface_type outputfile An example command is: java -jar carts.jar 1-1.10-in.xml MPR2 1-1.10-out.xml

Re: [Xen-devel] RT-Xen on ARM

Hi Andrii, On Wed, Sep 27, 2017 at 8:37 AM, Andrii Anisov wrote: > > Dear Meng Xu, > > > On 22.08.17 05:02, Meng Xu wrote: >> >> Given the set of tasks in each VM, we compute the VCPUs' periods and >> budgets, using the CARTS tool [1]. Note that each task has a period >>

Re: [Xen-devel] RT-Xen on ARM

Dear Meng Xu, On 22.08.17 05:02, Meng Xu wrote: Given the set of tasks in each VM, we compute the VCPUs' periods and budgets, using the CARTS tool [1]. Note that each task has a period and a worst-case execution time (wcet). [1] https://rtg.cis.upenn.edu/carts/ In a CARTS tool documentation

Re: [Xen-devel] RT-Xen on ARM

On Mon, Aug 21, 2017 at 4:38 AM, Andrii Anisov wrote: > > On 18.08.17 23:43, Meng Xu wrote: >> >> Sure. The workload we used in the paper is mainly the cpu-intensive task. >> We first calibrate a busy-loop of multiplications that runs for 1ms. >> Then for a task that

Re: [Xen-devel] RT-Xen on ARM

On Mon, Aug 21, 2017 at 4:16 AM, Andrii Anisov wrote: > > On 21.08.17 11:07, Andrii Anisov wrote: >> >> Hello Meng Xu, >> >> >> On 18.08.17 23:43, Meng Xu wrote: >>> >>> The Section 4.1 and 4.2 in [1] explained the whole experiment steps. >>> If you have any question or

Re: [Xen-devel] RT-Xen on ARM

On Mon, Aug 21, 2017 at 4:07 AM, Andrii Anisov wrote: > > Hello Meng Xu, > > > On 18.08.17 23:43, Meng Xu wrote: >> >> The Section 4.1 and 4.2 in [1] explained the whole experiment steps. >> If you have any question or confusion on a specific step, please feel >> free to

Re: [Xen-devel] RT-Xen on ARM

On 18.08.17 23:43, Meng Xu wrote: Sure. The workload we used in the paper is mainly the cpu-intensive task. We first calibrate a busy-loop of multiplications that runs for 1ms. Then for a task that executes for exe(ms), we simply let the task execute the 1ms busy loop for exe times. I'm a bit

Re: [Xen-devel] RT-Xen on ARM

On 21.08.17 11:07, Andrii Anisov wrote: Hello Meng Xu, On 18.08.17 23:43, Meng Xu wrote: The Section 4.1 and 4.2 in [1] explained the whole experiment steps. If you have any question or confusion on a specific step, please feel free to let me know. From the document it is not really clear if

Re: [Xen-devel] RT-Xen on ARM

Hello Meng Xu, On 18.08.17 23:43, Meng Xu wrote: The Section 4.1 and 4.2 in [1] explained the whole experiment steps. If you have any question or confusion on a specific step, please feel free to let me know. From the document it is not really clear if you ran one guest RT domain or several

Re: [Xen-devel] RT-Xen on ARM

Hi Andrii, On Tue, Aug 1, 2017 at 4:02 AM, Andrii Anisov wrote: > Hello Meng Xu, > > I've get back to this stuff. Sorry for the late response. I'm not sure if you have already solved this. > > > On 03.07.17 17:58, Andrii Anisov wrote: >> >> That's why we are going to

Re: [Xen-devel] RT-Xen on ARM

Hello Meng Xu, I've get back to this stuff. On 03.07.17 17:58, Andrii Anisov wrote: That's why we are going to keep configuration (of guests and workloads) close to [1] for evaluation, but on our target SoC. I'm wondering if there are known issues or specifics for ARM. [1]

Re: [Xen-devel] RT-Xen on ARM

On Fri, 2017-07-07 at 14:29 -0400, Meng Xu wrote: > On Wed, Jul 5, 2017 at 4:29 AM, Dario Faggioli > wrote: > > > The total utilization can help answer if the VCPU parameters are > feasible or not. > I'm just saying that we could keep track of utilization and, if on an

Re: [Xen-devel] RT-Xen on ARM

Hello Meng Xu, On 07.07.17 21:43, Meng Xu wrote: Andrii, If you encountered any question/difficulty in choosing the proper VCPU parameters for your workload, please don't hesitate to ping me and Dario. Thank you. I'll keep you in touch when we have something specified. -- *Andrii Anisov*

Re: [Xen-devel] RT-Xen on ARM

[sorry, my finger slips. let me rephrase my last sentence.] > >> For example, if you have a particular task in the VM that you need must >> absolutely execute for at least 10ms every 100ms, you can: >> - inside the VM, pin the task to vCPU 0, and give it top priority; >> - at the Xen level, give

Re: [Xen-devel] RT-Xen on ARM

On Wed, Jul 5, 2017 at 4:51 AM, Dario Faggioli wrote: > On Mon, 2017-07-03 at 14:42 -0400, Meng Xu wrote: >> On Mon, Jul 3, 2017 at 10:58 AM, Andrii Anisov > m> wrote: >> > >> Once the scheduling policy is determined, you will need to configure

Re: [Xen-devel] RT-Xen on ARM

On Wed, Jul 5, 2017 at 4:29 AM, Dario Faggioli wrote: > On Tue, 2017-07-04 at 11:12 -0400, Meng Xu wrote: >> On Tue, Jul 4, 2017 at 8:28 AM, Andrii Anisov > > wrote: >> > >> > So you are suggesting to introduce more RT schedulers with >> >

Re: [Xen-devel] RT-Xen on ARM

On Mon, 2017-07-03 at 14:42 -0400, Meng Xu wrote: > On Mon, Jul 3, 2017 at 10:58 AM, Andrii Anisov m> wrote: > > > Once the scheduling policy is determined, you will need to configure > the VCPUs' parameters based on the systems' workload. > This requires the workload's

Re: [Xen-devel] RT-Xen on ARM

On Tue, 2017-07-04 at 15:28 +0300, Andrii Anisov wrote: > On 03.07.17 21:42, Meng Xu wrote: > > > > The RTDS uses the EDF scheduling, under which the priorities of the > > VCPUs (or VMs) are dynamically changed based on their (absolute) > > deadlines. This provides better real-time performance

Re: [Xen-devel] RT-Xen on ARM

On Tue, 2017-07-04 at 11:12 -0400, Meng Xu wrote: > On Tue, Jul 4, 2017 at 8:28 AM, Andrii Anisov > wrote: > > > > So you are suggesting to introduce more RT schedulers with > > different algorithms. Did I get you right? > > The EDF scheduling cares about the overall

Re: [Xen-devel] RT-Xen on ARM

On Mon, 2017-07-03 at 14:03 +0300, Andrii Anisov wrote: > - root@salvator-x-h3-xt:/scripts# xl sched-rtds -d DomU -v all -p > 1  > -b 2500 >    (XEN) FLASK: Denying unknown domctl_scheduler_op: 2. >    libxl: error: libxl_sched.c:663:sched_rtds_vcpu_set_all: Domain  > 2:Setting vcpu sched

Re: [Xen-devel] RT-Xen on ARM

On Tue, Jul 4, 2017 at 8:28 AM, Andrii Anisov wrote: > > > On 03.07.17 21:42, Meng Xu wrote: >> >> As far as I know, there is no known issue for ARM as long as that >> version Xen runs on the ARM board. > > That's good. >> >> I assume you have your own workloads to run,

Re: [Xen-devel] RT-Xen on ARM

On 03.07.17 21:42, Meng Xu wrote: As far as I know, there is no known issue for ARM as long as that version Xen runs on the ARM board. That's good. I assume you have your own workloads to run, which are periodically activated task. The workloads in [1] are independent periodic CPU-intensive

Re: [Xen-devel] RT-Xen on ARM

On Mon, Jul 3, 2017 at 10:58 AM, Andrii Anisov wrote: > Hello Meng Xu, > > > On 03.07.17 16:35, Meng Xu wrote: >>> >>> Do you have any recommendations or suggestions? >> >> Which experiment/use case do you plan to run? >> What are the requirements (or performance

Re: [Xen-devel] RT-Xen on ARM

Hello Meng Xu, On 03.07.17 16:35, Meng Xu wrote: Do you have any recommendations or suggestions? Which experiment/use case do you plan to run? What are the requirements (or performance guarantees) you want to have from RTDS? Currently we have no defined target use-cases. That's why we are

Re: [Xen-devel] RT-Xen on ARM

On Mon, Jul 3, 2017 at 7:03 AM, Andrii Anisov wrote: > > Dear Meng Xu, Hi Andrii, > > > We are going to evaluate an RTDS scheduler on ARM. > > > Basically I'm going to repeat use-cases described in > https://www.cis.upenn.edu/~linhphan/papers/emsoft14-rt-xen.pdf in some

Re: [Xen-devel] RT-Xen on ARM

On 03.07.17 16:03, Wei Liu wrote: This is a bit strange, fc658208e026242420b9924a9e4bfa581479e1f5 seems to imply xentop should work on ARM. Yep it is built. But yocto missed its installation. That issue is on our site :) -- *Andrii Anisov* ___

Re: [Xen-devel] RT-Xen on ARM

On Mon, Jul 03, 2017 at 02:03:33PM +0300, Andrii Anisov wrote: > Dear Meng Xu, > > We are going to evaluate an RTDS scheduler on ARM. > > Basically I'm going to repeat use-cases described in > https://www.cis.upenn.edu/~linhphan/papers/emsoft14-rt-xen.pdf in some > amount. > > Do you have any

[Xen-devel] RT-Xen on ARM

Dear Meng Xu, We are going to evaluate an RTDS scheduler on ARM. Basically I'm going to repeat use-cases described in https://www.cis.upenn.edu/~linhphan/papers/emsoft14-rt-xen.pdf in some amount. Do you have any recommendations or suggestions? BTW, even following