On Wed, Oct 10, 2018 at 6:41 PM Meng Xu <xumengpa...@gmail.com> wrote:
>
> The jitter may come from Xen or the OS in dom0.
> It will be useful to know what is the jitter if you run the test on PetaLinux.
> (It's understandable the jitter is gone without OS. It is also common
> that OS introduces various interferences.)
Hi Meng,
well... I'm using bare-metal application and I need it exclusively to
be ran on one CPU as domU (guest) without OS (and I'm not sure how
would I make the same app to be ran on PetaLinux dom0 :D haha).
Is there a chance that PetaLinux as dom0 is creating this jitter and
how? Is there a way of decreasing it?
Yes, there are no prints.
I'm not sure about this timer interrupt passthrough because I didn't
find any example of it, in attachment I included xen-overlay.dtsi file
which I edited to add passthrough, in earlier replies there are
bare-metal configuration file. It would be helpful to know if those
setting are correct. If they are not correct it would explain the
jitter.
Thanks in advance, Milan Boberic!
/ {
chosen {
#address-cells = <2>;
#size-cells = <1>;
xen,xen-bootargs = "console=dtuart dtuart=serial0 dom0_mem=768M
bootscrub=0 dom0_max_vcpus=1 dom0_vcpus_pin=true timer_slop=0 sched=null
vwfi=native";
xen,dom0-bootargs = "console=hvc0 earlycon=xen earlyprintk=xen
maxcpus=1 clk_ignore_unused";
dom0 {
compatible = "xen,linux-zimage", "xen,multiboot-module";
reg = <0x0 0x80000 0x3100000>;
};
};
};
&smmu {
status = "okay";
mmu-masters = < &gem0 0x874
&gem1 0x875
&gem2 0x876
&gem3 0x877
&dwc3_0 0x860
&dwc3_1 0x861
&qspi 0x873
&lpd_dma_chan1 0x868
&lpd_dma_chan2 0x869
&lpd_dma_chan3 0x86a
&lpd_dma_chan4 0x86b
&lpd_dma_chan5 0x86c
&lpd_dma_chan6 0x86d
&lpd_dma_chan7 0x86e
&lpd_dma_chan8 0x86f
&fpd_dma_chan1 0x14e8
&fpd_dma_chan2 0x14e9
&fpd_dma_chan3 0x14ea
&fpd_dma_chan4 0x14eb
&fpd_dma_chan5 0x14ec
&fpd_dma_chan6 0x14ed
&fpd_dma_chan7 0x14ee
&fpd_dma_chan8 0x14ef
&sdhci0 0x870
&sdhci1 0x871
&nand0 0x872>;
};
&uart1 {
xen,passthrough = <0x1>;
};
&gpio {
xen,passthrough = <0x1>;
};
&ttc0 {
xen,passthrough = <0x1>;
};
&ttc1 {
xen,passthrough = <0x1>;
};
&ttc2 {
xen,passthrough = <0x1>;
};
&ttc3 {
xen,passthrough = <0x1>;
};_______________________________________________
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