Re: Dom0 bad network performance

[Matthias Petermann <mp%petermann-it.de@localhost>]

Hello Jaromir,

Am 14.02.21 um 20:16 schrieb Jaromír Doleček:
> Le dim. 14 févr. 2021 à 13:28, Mathew, Cherry G. <c%bow.st@localhost> a écrit :
> > I'm not sure if the interrupt sharing is a problem either because all interrupts are despatched through a central stub anyway - however the numbers you show below, if for similar time periods show a high number which is unusual. if, as I earlier requested, you could get fixed interval numbers and average them across several time slices across the iperf test you are running, it would be good.
>
> Avoiding the interrupt sharing is still useful, since you avoid the
> I/O read from the interrupt routine. So that can have an effect.
>
> That was the primary driver for the MSI support I've added.
> Unfortunately MSI-X didn't work out, so it's still disabled - so for
> the re0 it still falls back to INTx. I'd like to get back to getting
> MSI-X working.
>
> Matthias, can you check if disabling sdhc* and ichsmb* does anything?

That sounds like a good plan. However, I can't manage to turn off the 
two drivers at boot time. When I add the last two lines to my boot.cfg:

```
menu=Boot Xen Test0:load /netbsd-XEN3_DOM0.gz console=pc;multiboot /xen.gz
menu=Boot Xen Test1:load /netbsd-XEN3_DOM0.gz console=pc;multiboot 
/xen.gz dom0_mem=512M dom0_max_vcpus=1 dom0_vcpus_pin console=vga
menu=Boot Xen Test2:load /netbsd10-XEN3_DOM0.gz console=com1;multiboot 
/xen.gz dom0_mem=4096M
menu=Boot normally:rndseed /var/db/entropy-file;boot
menu=Boot single user:rndseed /var/db/entropy-file;boot -s
menu=Drop to boot prompt:prompt
default=1
timeout=5
clear=1
userconf=disable sdhc*
userconf=disable ichsmb*
```

I get the following message at boot time:

```
Loading /netbsd-XEN3_DOM0.gz
heap full (0x6fa80+32768)
```

Any ideas what is wrong here?

Kind regards
Matthias