On 03/22/2014 03:15 AM, lwch...@cs.hku.hk wrote:
> I observe that sometimes irq_time only includes "part" of steal_time.
>
> Like you said, irq_time is in dozens-of-microseconds. In VMs, as all
> devices seen are virtual ones, irq_time seems to be not as desired
> as it is in physical hosts.
>
On Sat, 2014-03-22 at 14:47 +0800, lwch...@cs.hku.hk wrote:
> I checked the source code again. I forgot to mention that I commented out
> steal_ticks() in my experiments (sorry):
Oh well, it wasn't a _complete_ waste of time. I now have a gaggle of
cute little alien boxen to dissect should I
Quoting Rik van Riel :
On 03/20/2014 11:01 AM, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, wrote:
[src/kernel/sched/core.c]
static void update_rq_clock_task(struct rq *rq, s64 delta)
{
... ...
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
irq_delta =
Quoting Mike Galbraith :
On Thu, 2014-03-20 at 12:01 -0300, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, wrote:
> In consolidated environments, when there are multiple virtual
machines (VMs)
> running on one CPU core, timekeeping will be a problem to the guest OS.
> Here, I
Quoting Mike Galbraith umgwanakikb...@gmail.com:
On Thu, 2014-03-20 at 12:01 -0300, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, lwch...@cs.hku.hk wrote:
In consolidated environments, when there are multiple virtual
machines (VMs)
running on one CPU core, timekeeping will be a
Quoting Rik van Riel r...@redhat.com:
On 03/20/2014 11:01 AM, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, lwch...@cs.hku.hk wrote:
[src/kernel/sched/core.c]
static void update_rq_clock_task(struct rq *rq, s64 delta)
{
... ...
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
On Sat, 2014-03-22 at 14:47 +0800, lwch...@cs.hku.hk wrote:
I checked the source code again. I forgot to mention that I commented out
steal_ticks() in my experiments (sorry):
Oh well, it wasn't a _complete_ waste of time. I now have a gaggle of
cute little alien boxen to dissect should I ever
On 03/22/2014 03:15 AM, lwch...@cs.hku.hk wrote:
I observe that sometimes irq_time only includes part of steal_time.
Like you said, irq_time is in dozens-of-microseconds. In VMs, as all
devices seen are virtual ones, irq_time seems to be not as desired
as it is in physical hosts.
A quick
On 03/20/2014 11:01 AM, Glauber Costa wrote:
> On Wed, Mar 19, 2014 at 6:42 AM, wrote:
>>
>> [src/kernel/sched/core.c]
>> static void update_rq_clock_task(struct rq *rq, s64 delta)
>> {
>> ... ...
>> #ifdef CONFIG_IRQ_TIME_ACCOUNTING
>> irq_delta = irq_time_read(cpu_of(rq))
On 03/20/2014 11:01 AM, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, lwch...@cs.hku.hk wrote:
[src/kernel/sched/core.c]
static void update_rq_clock_task(struct rq *rq, s64 delta)
{
... ...
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
irq_delta =
On Thu, 2014-03-20 at 12:01 -0300, Glauber Costa wrote:
> On Wed, Mar 19, 2014 at 6:42 AM, wrote:
> > In consolidated environments, when there are multiple virtual machines (VMs)
> > running on one CPU core, timekeeping will be a problem to the guest OS.
> > Here, I report my findings about
On Wed, Mar 19, 2014 at 6:42 AM, wrote:
> In consolidated environments, when there are multiple virtual machines (VMs)
> running on one CPU core, timekeeping will be a problem to the guest OS.
> Here, I report my findings about Linux process scheduler.
>
>
> Description
>
> Linux
On Wed, Mar 19, 2014 at 6:42 AM, lwch...@cs.hku.hk wrote:
In consolidated environments, when there are multiple virtual machines (VMs)
running on one CPU core, timekeeping will be a problem to the guest OS.
Here, I report my findings about Linux process scheduler.
Description
On Thu, 2014-03-20 at 12:01 -0300, Glauber Costa wrote:
On Wed, Mar 19, 2014 at 6:42 AM, lwch...@cs.hku.hk wrote:
In consolidated environments, when there are multiple virtual machines (VMs)
running on one CPU core, timekeeping will be a problem to the guest OS.
Here, I report my findings
In consolidated environments, when there are multiple virtual machines (VMs)
running on one CPU core, timekeeping will be a problem to the guest OS.
Here, I report my findings about Linux process scheduler.
Description
Linux CFS relies on rq->clock_task to charge each task,
In consolidated environments, when there are multiple virtual machines (VMs)
running on one CPU core, timekeeping will be a problem to the guest OS.
Here, I report my findings about Linux process scheduler.
Description
Linux CFS relies on rq-clock_task to charge each task,
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