From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Keir Fraser <keir.xen@gmail.com>
Cc: Simon Martin <smartin@milliways.cl>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: VCPUOP_set_periodic_timer
Date: Fri, 15 Nov 2013 13:13:12 +0000 [thread overview]
Message-ID: <52861DE8.5060208@citrix.com> (raw)
In-Reply-To: <CEABCDB6.3F368%keir.xen@gmail.com>
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On 15/11/13 13:10, Keir Fraser wrote:
> Re: Re[4]: [Xen-devel] VCPUOP_set_periodic_timer You'll have to
> measure to confirm, but if the core is dedicated to your vcpu then
> there is no reason there should be 50us jitter. Also there is not much
> point playing with different schedulers --- if there are no other
> vcpus schedulable on the cpu, the scheduler can't have multiple
> runnable vcpus to choose between.
>
> -- Keir
The deadline timer code as up to 50us of slop when calculating when to
wake up and when timers expire. It is somewhat poor, and is certainly
an area in need of improvement.
~Andrew
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next prev parent reply other threads:[~2013-11-15 13:13 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-14 21:18 VCPUOP_set_periodic_timer Simon Martin
2013-11-14 21:39 ` VCPUOP_set_periodic_timer Andrew Cooper
2013-11-15 11:24 ` VCPUOP_set_periodic_timer Simon Martin
2013-11-15 11:36 ` VCPUOP_set_periodic_timer Keir Fraser
2013-11-15 11:45 ` VCPUOP_set_periodic_timer Simon Martin
2013-11-15 11:56 ` VCPUOP_set_periodic_timer Keir Fraser
2013-11-15 12:37 ` VCPUOP_set_periodic_timer Simon Martin
2013-11-15 13:10 ` VCPUOP_set_periodic_timer Keir Fraser
2013-11-15 13:13 ` Andrew Cooper [this message]
2013-11-15 13:39 ` VCPUOP_set_periodic_timer Keir Fraser
2013-11-15 11:41 ` VCPUOP_set_periodic_timer Andrew Cooper
2013-11-15 12:02 ` VCPUOP_set_periodic_timer Simon Martin
2013-11-15 12:17 ` VCPUOP_set_periodic_timer Andrew Cooper
2013-11-15 12:46 ` VCPUOP_set_periodic_timer Nate Studer
2013-11-15 12:52 ` VCPUOP_set_periodic_timer Andrew Cooper
2013-11-15 12:54 ` VCPUOP_set_periodic_timer George Dunlap
2013-11-15 21:10 ` VCPUOP_set_periodic_timer Dario Faggioli
2013-11-16 20:37 ` VCPUOP_set_periodic_timer Simon Martin
2013-11-18 18:28 ` VCPUOP_set_periodic_timer Dario Faggioli
2013-11-26 14:50 ` PV guest timings Simon Martin
2013-11-26 15:11 ` Keir Fraser
2013-11-26 15:38 ` Simon Martin
2013-11-26 23:33 ` Dario Faggioli
2013-11-27 2:32 ` Simon Martin
2013-11-27 8:46 ` Dario Faggioli
2013-11-27 12:04 ` Simon Martin
2013-11-27 10:38 ` David Vrabel
2013-11-27 14:07 ` Simon Martin
2013-11-26 23:31 ` Dario Faggioli
2013-11-27 2:36 ` Simon Martin
2013-11-27 8:56 ` Dario Faggioli
2013-11-27 13:00 ` Simon Martin
2013-11-28 11:16 ` Dario Faggioli
2013-11-28 11:57 ` Simon Martin
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