Hi Leo,
Thank you for the fantastic work with so many good details. Apologies
for the late reply -- I have been traveling and on holiday.
On Fri, 28 Oct 2022, Leo Yan wrote:
> Hi Stefano,
>
> On Tue, Oct 25, 2022 at 04:58:16PM -0700, Stefano Stabellini wrote:
> > On Mon, 24 Oct 2022, Leo Yan wr
On Fri, Oct 28, 2022 at 05:54:05PM +0800, Leo Yan wrote:
[...]
> If map to the code, I think the function xennet_start_xmit() in Xen
> frontend driver is critical for the sending interval in domU. I can
> see several things cost time when sending a packet:
>
> - Xen frontend driver needs to set
Hi Stefano,
On Tue, Oct 25, 2022 at 04:58:16PM -0700, Stefano Stabellini wrote:
> On Mon, 24 Oct 2022, Leo Yan wrote:
> > > If you are really running with the NULL scheduler, then I would
> > > investigate why the vCPU has is_running == 0 because it should not
> > > happen.
> >
> > Correct for th
On Mon, 24 Oct 2022, Leo Yan wrote:
> > If you are really running with the NULL scheduler, then I would
> > investigate why the vCPU has is_running == 0 because it should not
> > happen.
>
> Correct for this: it's my bad that I didn't really enable NULL scheduler
> in my code base. After I enable
On Fri, Oct 21, 2022 at 02:14:04PM -0700, Stefano Stabellini wrote:
[...]
> > > # domU side
> > > xen/arch/arm/vgic-v2.c:vgic_v2_to_sgi
> > > xen/arch/arm/vgic.c:vgic_to_sgi
> > > xen/arch/arm/vgic.c:vgic_inject_irq
> > > xen/arch/arm/vgic.c:vcpu_kick
> > > xen/arch/arm/gic-v2.c:gicv2_send_SGI
>
On Fri, 21 Oct 2022, Leo Yan wrote:
> Hi Stefano and all,
>
> On Mon, Oct 17, 2022 at 04:50:05PM -0700, Stefano Stabellini wrote:
>
> [...]
>
> > > We can see DomU sends notification with timestamp (raw counter) is
> > > 4989078592 and Dom0 receives the interrupt with timestamp 4989092169.
> > >
Hi Stefano and all,
On Mon, Oct 17, 2022 at 04:50:05PM -0700, Stefano Stabellini wrote:
[...]
> > We can see DomU sends notification with timestamp (raw counter) is
> > 4989078592 and Dom0 receives the interrupt with timestamp 4989092169.
> > Since Dom0 and DomU use the same time counter and the
Hi Stefano,
On 18/10/2022 20:54, Stefano Stabellini wrote:
On Tue, 18 Oct 2022, Leo Yan wrote:
On Mon, Oct 17, 2022 at 04:50:05PM -0700, Stefano Stabellini wrote:
[...]
Which means it takes 543us to let Dom0 to receive the notification.
You could see DomU runs in CPU3 and Dom0 runs on CPU13,
On Tue, 18 Oct 2022, Leo Yan wrote:
> On Mon, Oct 17, 2022 at 04:50:05PM -0700, Stefano Stabellini wrote:
>
> [...]
>
> > > Which means it takes 543us to let Dom0 to receive the notification.
> > > You could see DomU runs in CPU3 and Dom0 runs on CPU13, there should
> > > not have contention for
On Mon, Oct 17, 2022 at 04:50:05PM -0700, Stefano Stabellini wrote:
[...]
> > Which means it takes 543us to let Dom0 to receive the notification.
> > You could see DomU runs in CPU3 and Dom0 runs on CPU13, there should
> > not have contention for CPU resources. Seems to me, it's likely Xen
> > h
On Mon, 17 Oct 2022, Leo Yan wrote:
> Hi Stefano,
>
> Sorry for late response. Please see below comments.
>
> On Tue, Oct 11, 2022 at 02:47:00PM -0700, Stefano Stabellini wrote:
> > On Tue, 11 Oct 2022, Leo Yan wrote:
> > > > > The second question is how to mitigate the long latency when send da
Hi Stefano,
Sorry for late response. Please see below comments.
On Tue, Oct 11, 2022 at 02:47:00PM -0700, Stefano Stabellini wrote:
> On Tue, 11 Oct 2022, Leo Yan wrote:
> > > > The second question is how to mitigate the long latency when send data
> > > > from DomU. A possible solution is the
On Tue, 11 Oct 2022, Leo Yan wrote:
> > > The second question is how to mitigate the long latency when send data
> > > from DomU. A possible solution is the Xen network forend driver copies
> > > skb into mediate (bounce) buffer, just like what does in Xen net
> > > backend driver with gnttab_batc
Hi Stefano,
On Mon, Oct 10, 2022 at 04:50:46PM -0700, Stefano Stabellini wrote:
> +Xen/Linux maintainers
Thanks for reviewing.
[...]
> > Throughput result:
> >
> > Profile netperf (Mbits/sec)ddsperf (Mbits/sec)
> > Xen-Dom0939.41 > 620
> > Xen-DomU
+Xen/Linux maintainers
On Mon, 10 Oct 2022, Leo Yan wrote:
> Hi there,
>
> I tested the networking performance on my Arm64 platform in Xen
> virtual machine, below I will try to give out summary for testing
> result and share some analysis, at the end I want to check a bit
> from the community a
Hi there,
I tested the networking performance on my Arm64 platform in Xen
virtual machine, below I will try to give out summary for testing
result and share some analysis, at the end I want to check a bit
from the community and get suggestion before I can proceed.
First of all, if you want to kno
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