Displaying 20 results from an estimated 11000 matches similar to: "Stolen and degraded time and schedulers"
2007 Apr 18
1
Use of absolute timeouts for oneshot timers
I've been thinking a bit more about how useful an absolute timeout is
for a oneshot timer in a virtual environment.
In principle, absolute times are generally preferable. A relative
timeout means "timeout in X ns from now", but the meaning of "now" is
ambiguous, particularly if the vcpu can be preempted at any time, which
means the determination of "now" can be
2007 Apr 18
1
Use of absolute timeouts for oneshot timers
I've been thinking a bit more about how useful an absolute timeout is
for a oneshot timer in a virtual environment.
In principle, absolute times are generally preferable. A relative
timeout means "timeout in X ns from now", but the meaning of "now" is
ambiguous, particularly if the vcpu can be preempted at any time, which
means the determination of "now" can be
2010 Jun 16
2
cpuspeed settings??
Hey, folks,
Sometimes my workstation bogs down... slows to a crawl. Using gkrellm,
it's obvious the CPU is the laggard. The top utility confirms: the load
average gets up over 4 at times. But this occurs when cpu stepping pegs
the speed at 600MHz. This processor is capable of 1.5GHz and when it's
allowed to run at that speed, the load average is under 2, which is fine.
So the
2010 Apr 24
3
Xen clocksources and timekeeping wiki page
Hello,
I was thinking of creating a wiki page about Xen clocksources and timekeeping..
including dom0, PV guests and HVM guests.
Dan and Jeremy: You guys might have some ideas for this page..
please let me know your thoughts :)
Subjects to cover:
- Xen hypervisor clocksources (hpet, acpi_pm, pit)
- Xen dom0 clocksource, ntpd, etc
- Xen PV guest clocksources, independent_wallclock, ntpd,
2008 Jun 19
15
Power aware credit scheduler
Existing credit scheduler is not power aware. To achieve better
power saving ability with negligible performance impact, following
areas may be tweaked and listed here for comments first.
Goal is not to silly save power with sacrifice of performance, e.g.
we don''t want to prevent migration when there''re free cpus with
some pending runqueues. But when free computing power is
2009 Jun 22
3
How to boot Ubuntu 9.04(Jaunty) or Debian Lenny (vmlinuz-2.6.26-2-686-bigmem) as domU under Lenny''s vmlinuz-2.6.26-2-xen-686 as dom0. PVM''s initrd issue
Hello, I guess it possible distro specific issue but is it resolvable?
I have one node(testing purpose) ganeti 2.0.1 cluster installed over
Debian5 Lenny. Almost everything from distro repositories. Only ganeti
2.0.1 and ganeti-debootstrap are from sources. I have it successful
run with vmlinuz-2.6.26-2-xen-686 and initrd.img-2.6.26-2-xen-686
from repositories. Both Dom0 and DomU are use the
2013 Oct 28
2
dracut Warning: Boot has failed. To debug this issue add "rdshell" to the kernel command line.
here is my problem:
Parsing config file vir2.cfg
Daemon running with PID 11570
Initializing cgroup subsys cpuset
Initializing cgroup subsys cpu
Linux version 3.0.0 (root@localhost.localdomain) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Mon Oct 28 00:35:01 CST 2013
Command line: root=/dev/hda1 ro
ACPI in unprivileged domain disabled
released 0 pages
2010 Jan 13
65
ntpd under Xen Dom0 exhibits extremely high jitter/noise? runs stable/quiet under non-xen kernel.
On a selection of boxes, ntpd running in Xen Dom0 reproducibly
exhibits extermely high noise/jitter.
Switching back to -default, non-xen kernel ntpd runs with very low jitter/noise.
Question -- how can I ''tame'' ntpd noise & jitter when running in Dom0?
Is the problem a config issue, or a bug?
Already reported this downstream; everybody''s "stumped".
2010 Jan 13
65
ntpd under Xen Dom0 exhibits extremely high jitter/noise? runs stable/quiet under non-xen kernel.
On a selection of boxes, ntpd running in Xen Dom0 reproducibly
exhibits extermely high noise/jitter.
Switching back to -default, non-xen kernel ntpd runs with very low jitter/noise.
Question -- how can I ''tame'' ntpd noise & jitter when running in Dom0?
Is the problem a config issue, or a bug?
Already reported this downstream; everybody''s "stumped".
2006 Oct 19
2
track a stolen laptop via rsync
My wife's Windows XP laptop was stolen a couple days ago. Every night the
computer automatically preforms an rsync to a Debian Linux computer (the
dumb-dumbs didn't steal that). My question: if the laptop successfully
connects to the Linux box can you think of anyway I can use this fact to
track the computer (maybe an IP address from its location., etc.)?
By they way I could really care
2009 Jul 07
2
Xen : Time issues
Hi everyone,
I''m working in a firm that monitor wan networks.
We have several nagios installed on virtual machines.
Recently we noticed that the DomU''s clocks are not synced with the Dom0 and the
clocks are wrong.
So we tried to sync DomU''s via openntpd but it generates errors in nagios. Logs
indicate "Time goes back".
So we want to sync DomU with Dom0 and
2012 Aug 09
1
[PATCH] drm/nouveau/nv50: Reclock when memory was stolen
Here's a quick-but-I-guess-tidy-fix for faulty behaviour someone reported in NVAF. I'm just not sure if the check for nvaa/nvac should still be in nv50_pm_clocks_pre... I believe this is wrong as they can reclock perfectly well (except the non-existing memory). Anyone has a definite answer to that?
2007 Apr 18
2
+ stupid-hack-to-make-mainline-build.patch added to -mm tree
Ingo Molnar wrote:
> * Ingo Molnar <mingo@elte.hu> wrote:
>
>
>> no, that's not the case: next_timer_interrupt() is the NO_IDLE_HZ
>> method of doing things - while in the NO_HZ case you are supposed to
>> use clockevent devices to program timer hardware.
>>
We don't have a clockevent device. But we need NO_IDLE_HZ support,
which NO_HZ
2007 Apr 18
2
+ stupid-hack-to-make-mainline-build.patch added to -mm tree
Ingo Molnar wrote:
> * Ingo Molnar <mingo@elte.hu> wrote:
>
>
>> no, that's not the case: next_timer_interrupt() is the NO_IDLE_HZ
>> method of doing things - while in the NO_HZ case you are supposed to
>> use clockevent devices to program timer hardware.
>>
We don't have a clockevent device. But we need NO_IDLE_HZ support,
which NO_HZ
2007 Apr 18
1
[PATCH 9/10] Vmi timer update.patch
Convert VMI timer to use clock events, making it properly able to use the NO_HZ
infrastructure. On UP systems, with no local APIC, we just continue to route
these events through the PIT. On systems with a local APIC, or SMP, we provide
a single source interrupt chip which creates the local timer IRQ. It actually
gets delivered by the APIC hardware, but we don't want to use the same local
2007 Apr 18
1
[PATCH 9/10] Vmi timer update.patch
Convert VMI timer to use clock events, making it properly able to use the NO_HZ
infrastructure. On UP systems, with no local APIC, we just continue to route
these events through the PIT. On systems with a local APIC, or SMP, we provide
a single source interrupt chip which creates the local timer IRQ. It actually
gets delivered by the APIC hardware, but we don't want to use the same local
2007 Apr 18
2
[PATCH RFC] Change softlockup watchdog to ignore stolen time
The softlockup watchdog is currently a nuisance in a virtual machine,
since the whole system could have the CPU stolen from it for a long
period of time. While it would be unlikely for a guest domain to be
denied timer interrupts for over 10s, it could happen and any softlockup
message would be completely spurious.
Earlier I proposed that sched_clock() return time in unstolen
nanoseconds, which
2007 Apr 18
2
[PATCH RFC] Change softlockup watchdog to ignore stolen time
The softlockup watchdog is currently a nuisance in a virtual machine,
since the whole system could have the CPU stolen from it for a long
period of time. While it would be unlikely for a guest domain to be
denied timer interrupts for over 10s, it could happen and any softlockup
message would be completely spurious.
Earlier I proposed that sched_clock() return time in unstolen
nanoseconds, which
2000 Sep 04
3
somebody's stolen my probabilities
gday gurus,
could someone please help me with this one? Can't find it in the doco.
summary of my lm object gives "Pr(>|t|)" but coef doesn't. How do I get
hold of these probabilities within an object? There doesn't seem to be an
appropriate attribute within the object - I was hoping for something like
"my.lm$probabilies".
I was hoping to grab the best t
2017 Sep 24
1
Notice: Check your tuned settings for a performance boost.
On 09/23/2017 03:52 AM, hw wrote:
> Thank you very much for the notice!? Looking at a couple machines, I found
> that the automatic choice of profile isn?t what I would want.
>
> Now I wonder how everyone deals with this, i. e. do you set a profile once
> and never change it, or do you keep changing the profile according to
> circumstances?? Is changing it even advisable, i. e.