On Wed, Mar 29, 2023, at 18:55, Helmut Grohne wrote:
> -cpu max
> Startup finished in 23.590s (kernel) + 18.210s (userspace) = 41.800s
> -cpu cortex-a57
> Startup finished in 6.090s (kernel) + 8.460s (userspace) = 14.551s
> -cpu max,pauth=off
> Startup finished in 4.756s (kernel) + 5.678s
On 2023-03-29 06:55, Helmut Grohne wrote:
> At this point, my preference is max,pauth-impdef=on.
Agreed.
> Would someone confirm that this also speeds up on arm64?
Confirmed.
Thanks!
ema
Hi Arnd,
On Wed, Mar 29, 2023 at 01:12:45PM +0200, Arnd Bergmann wrote:
> The machine I use has KVM support for 64-bit guests, so
> I think you have this the wrong way around: If you run
> the arm64 guest with TCG, I would expect to see the
> same effect on an arm64 host and an x86 host.
Thanks
Hi,
On 2023-03-29 01:12, Arnd Bergmann wrote:
> a) try to reproduce the behavior on an x86-64 host
Good point. Also on a x86-64 host cpu=cortex-a57 is significantly
faster:
max:
[ 30.086331] systemd[1]: Hostname set to .
cortex-a57:
[ 13.870771] systemd[1]: Hostname set to .
On Wed, Mar 29, 2023, at 12:41, Helmut Grohne wrote:
> On Wed, Mar 29, 2023 at 11:58:24AM +0200, Emanuele Rocca wrote:
>
> Thanks for the report. Since I mainly use it on amd64, I am not affected
> by this change and seek feedback from Arnd and Johannes as they will be
> affected.
The machine I
Hi Emanuele,
On Wed, Mar 29, 2023 at 11:58:24AM +0200, Emanuele Rocca wrote:
> some arm64 hosts unfortunately do not have KVM support:
>
> kvm [1]: HYP mode not available
>
> On those systems, running qemu with -cpu=cortex-a57 results in
> significantly improved performance compared to
Package: debvm
Version: 0.2.9
Hi,
some arm64 hosts unfortunately do not have KVM support:
kvm [1]: HYP mode not available
On those systems, running qemu with -cpu=cortex-a57 results in
significantly improved performance compared to -cpu=max.
For example: here is how long it takes debvm-run
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