Hello Michael and Paul,
Am 05.09.2022 um 07:29 schrieb Michael van Elst:
p...@whooppee.com (Paul Goyette) writes:
You would have to modify the appropriate module's Makefile to add
the HZ=1000 definition.
ZFS doesn't use HZ, but in osnet/sys/sys/time.h it uses a value hz=100
to compute the
Hello all,
On 12.09.22 15:00, Matthias Petermann wrote:
CONCLUSION
- Due to the root cause (well explained in [1]) the clocks in the VMs
are potentially running slow.
- The root cause can be mitigated by a higher HZ in the host kernel
compared to the guest kernel.
- ntpd can be
Hello all,
Am 31.08.2022 um 11:29 schrieb Matthias Petermann:
Hello all,
I have a NetBSD 9.3 host that hosts multiple virtual machines (Qemu with
nvmm acceleration). One peculiarity: I use estd on the host to control
down the power consumption of the whole system via frequency scaling
when
p...@whooppee.com (Paul Goyette) writes:
>You would have to modify the appropriate module's Makefile to add
>the HZ=1000 definition.
ZFS doesn't use HZ, but in osnet/sys/sys/time.h it uses a value hz=100
to compute the lbolt time.
Does this help ?
Index: external/cddl/osnet/sys/sys/time.h
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On Mon, 5 Sep 2022, Robert Elz wrote:
Date:Sun, 4 Sep 2022 10:52:31 +0200
From:Matthias Petermann
Message-ID: <06b5d183-36c7-30bf-56be-8e507dffd...@petermann-it.de>
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Date:Sun, 4 Sep 2022 10:52:31 +0200
From:Matthias Petermann
Message-ID: <06b5d183-36c7-30bf-56be-8e507dffd...@petermann-it.de>
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Hi Robert,
please allow me one mor more question
On 04.09.22 10:42, Matthias Petermann wrote:
Hi Robert,
On 04.09.22 02:58, Robert Elz wrote:
if that implies that you rebuilt the kernel with HZ=1000 and then used
the zfs module built with HZ=100 then I think the first thing I would try
Hi Robert,
On 04.09.22 02:58, Robert Elz wrote:
if that implies that you rebuilt the kernel with HZ=1000 and then used
the zfs module built with HZ=100 then I think the first thing I would try
would be to rebuild the module(s?) with HZ=1000
Good point... I'll try that right away. This might
Hello,
On 03.09.22 13:51, Matthias Petermann wrote:
it took a while - in the meantime I could test the 1000HZ kernel on my
system. Unfortunately I had an effect right at the first test, which
forced me to roll back the change first. I hope I'll get around to
recreating this on a less critical
Date:Sat, 3 Sep 2022 13:51:25 +0200
From:Matthias Petermann
Message-ID: <8c9bbdbc-5583-7f2d-4e04-ab550b6ee...@petermann-it.de>
I cannot really help with zfs issues, I know nothing about it, but:
| The zfs module was loaded though, I also built the kernel with
Hello Robert,
On 31.08.22 16:57, Robert Elz wrote:
Date:Wed, 31 Aug 2022 13:42:13 +0200
From:Matthias Petermann
Message-ID:
| I'm also curious about the effect on energy consumption - i.e., whether
| it's measurable.
I'm sure its measurable, but I
ps: arithmetic has never really been my thing, the 10.1ms I mentioned
should probably have been 11ms instead.
kre
Date:Wed, 31 Aug 2022 13:42:13 +0200
From:Matthias Petermann
Message-ID:
| I'm also curious about the effect on energy consumption - i.e., whether
| it's measurable.
I'm sure its measurable, but I suspect you'd need a highly accurate
and very precise ammeter
Hello Robert,
Am 31.08.2022 um 13:03 schrieb Robert Elz:
[...]
About the rtc, no no idea. But to deal with the problem, aside from
major NetBSD code rewrites (the so called tickless kernel) the one
solution that should work is to run the host with HZ set a lot higher,
and leave the guest(s)
Date:Wed, 31 Aug 2022 11:29:06 +0200
From:Matthias Petermann
Message-ID:
| The guests' time increasingly lags behind with continued operation. Also
| the ntpd seems to have no compensating effect in the guests here.
This is a well known issue, ntp in the guest
Hello all,
I have a NetBSD 9.3 host that hosts multiple virtual machines (Qemu with
nvmm acceleration). One peculiarity: I use estd on the host to control
down the power consumption of the whole system via frequency scaling
when there is no load.
The time of the host is synchronized via
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