From: Blue Swirl <blauwirbel@gmail.com>
To: Paul Brook <paul@codesourcery.com>
Cc: Jan Kiszka <jan.kiszka@web.de>,
qemu-devel@nongnu.org, Juan Quintela <quintela@redhat.com>
Subject: Re: [Qemu-devel] Re: [RFT][PATCH 07/15] qemu_irq: Add IRQ handlers with delivery feedback
Date: Fri, 28 May 2010 19:10:17 +0000 [thread overview]
Message-ID: <AANLkTikLlPfs0XYlxKIGbXnx0fDdKJdBZQFYY0i0MrJr@mail.gmail.com> (raw)
In-Reply-To: <201005272321.43949.paul@codesourcery.com>
On Thu, May 27, 2010 at 10:21 PM, Paul Brook <paul@codesourcery.com> wrote:
>
>> >> Then the amount
>> >> of CPU cycles between timer interrupts would increase and hopefully
>> >> the guest can keep up. If the guest sleeps, time base could be
>> >> accelerated to catch up with wall clock and then set back to 1:1 rate.
>> >
>> > Can't follow you ATM, sorry. What should be slowed down then? And how
>> > precisely?
>>
>> I think vm_clock and everything that depends on vm_clock, also
>> rtc_clock should be tied to vm_clock in this mode, not host_clock.
>
> The problem is more fundamental than that. There is no real correlation
> between vm_clock and the amount of code executed by the guest, especially not
> on timescales less than a second.
Can we measure (or at least estimate with higher accuracy than the
tick IRQ delivery jitter) the amount of code executed, somehow? For
example, add TSC sampling to all TB or KVM VCPU exit and load/store
paths?
next prev parent reply other threads:[~2010-05-28 19:10 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-24 20:13 [Qemu-devel] [RFT][PATCH 00/15] HPET cleanups, fixes, enhancements Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 01/15] hpet: Catch out-of-bounds timer access Jan Kiszka
2010-05-24 20:34 ` [Qemu-devel] " Juan Quintela
2010-05-24 20:36 ` Jan Kiszka
2010-05-24 20:50 ` Juan Quintela
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 02/15] hpet: Coding style cleanups and some refactorings Jan Kiszka
2010-05-24 20:37 ` [Qemu-devel] " Juan Quintela
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 03/15] hpet: Silence warning on write to running main counter Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 04/15] hpet: Move static timer field initialization Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 05/15] hpet: Convert to qdev Jan Kiszka
2010-05-25 9:37 ` Paul Brook
2010-05-25 10:14 ` Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 06/15] hpet: Start/stop timer when HPET_TN_ENABLE is modified Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 07/15] qemu_irq: Add IRQ handlers with delivery feedback Jan Kiszka
2010-05-25 6:07 ` Gleb Natapov
2010-05-25 6:31 ` Jan Kiszka
2010-05-25 6:40 ` Gleb Natapov
2010-05-25 6:54 ` Jan Kiszka
2010-05-25 19:09 ` [Qemu-devel] " Blue Swirl
2010-05-25 20:16 ` Anthony Liguori
2010-05-25 21:44 ` Jan Kiszka
2010-05-26 8:08 ` Gleb Natapov
2010-05-26 20:14 ` Blue Swirl
2010-05-27 5:42 ` Gleb Natapov
2010-05-26 19:55 ` Blue Swirl
2010-05-26 20:09 ` Jan Kiszka
2010-05-26 20:35 ` Blue Swirl
2010-05-26 22:35 ` Jan Kiszka
2010-05-26 23:26 ` Paul Brook
2010-05-27 17:56 ` Blue Swirl
2010-05-27 18:31 ` Jan Kiszka
2010-05-27 18:53 ` Blue Swirl
2010-05-27 19:08 ` Jan Kiszka
2010-05-27 19:19 ` Blue Swirl
2010-05-27 22:19 ` Jan Kiszka
2010-05-28 19:00 ` Blue Swirl
2010-05-30 12:00 ` Avi Kivity
2010-05-27 22:21 ` Paul Brook
2010-05-28 19:10 ` Blue Swirl [this message]
2010-05-27 22:21 ` Paul Brook
2010-05-27 6:13 ` Gleb Natapov
2010-05-27 18:37 ` Blue Swirl
2010-05-28 7:31 ` Gleb Natapov
2010-05-28 20:06 ` Blue Swirl
2010-05-28 20:47 ` Gleb Natapov
2010-05-29 7:58 ` Jan Kiszka
2010-05-29 9:35 ` Blue Swirl
2010-05-29 9:45 ` Jan Kiszka
2010-05-29 10:04 ` Blue Swirl
2010-05-29 10:16 ` Jan Kiszka
2010-05-29 10:26 ` Blue Swirl
2010-05-29 10:38 ` Jan Kiszka
2010-05-29 14:46 ` Gleb Natapov
2010-05-29 16:13 ` Blue Swirl
2010-05-29 16:37 ` Gleb Natapov
2010-05-29 21:21 ` Blue Swirl
2010-05-30 6:02 ` Gleb Natapov
2010-05-30 12:10 ` Blue Swirl
2010-05-30 12:24 ` Jan Kiszka
2010-05-30 12:58 ` Blue Swirl
2010-05-31 7:46 ` Jan Kiszka
2010-05-30 12:33 ` Gleb Natapov
2010-05-30 12:56 ` Blue Swirl
2010-05-30 13:49 ` Gleb Natapov
2010-05-30 16:54 ` Blue Swirl
2010-05-30 19:37 ` Blue Swirl
2010-05-30 20:07 ` Gleb Natapov
2010-05-30 20:21 ` Blue Swirl
2010-05-31 5:19 ` Gleb Natapov
2010-06-01 18:00 ` Blue Swirl
2010-06-01 18:30 ` Gleb Natapov
2010-06-02 19:05 ` Blue Swirl
2010-06-03 6:23 ` Jan Kiszka
2010-06-03 6:34 ` Gleb Natapov
2010-06-03 6:59 ` Jan Kiszka
2010-06-03 7:03 ` Gleb Natapov
2010-06-03 7:06 ` Gleb Natapov
2010-06-04 19:05 ` Blue Swirl
2010-06-05 0:04 ` Jan Kiszka
2010-06-05 7:20 ` Blue Swirl
2010-06-05 8:27 ` Jan Kiszka
2010-06-05 9:23 ` Blue Swirl
2010-06-05 12:14 ` Jan Kiszka
2010-06-06 7:15 ` Gleb Natapov
2010-06-06 7:39 ` Jan Kiszka
2010-06-06 7:49 ` Gleb Natapov
2010-06-06 8:07 ` Jan Kiszka
2010-06-06 9:23 ` Gleb Natapov
2010-06-06 10:10 ` Jan Kiszka
2010-06-06 10:27 ` Gleb Natapov
2010-06-06 7:39 ` Blue Swirl
2010-06-06 8:07 ` Gleb Natapov
2010-05-30 13:22 ` Blue Swirl
2010-05-29 9:15 ` Blue Swirl
2010-05-29 9:36 ` Jan Kiszka
2010-05-29 14:38 ` Gleb Natapov
2010-05-29 16:03 ` Blue Swirl
2010-05-29 16:32 ` Gleb Natapov
2010-05-29 20:52 ` Blue Swirl
2010-05-30 5:41 ` Gleb Natapov
2010-05-30 11:41 ` Blue Swirl
2010-05-30 11:52 ` Gleb Natapov
2010-05-30 12:05 ` Avi Kivity
2010-05-27 5:58 ` Gleb Natapov
2010-05-26 19:49 ` Blue Swirl
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 08/15] x86: Refactor RTC IRQ coalescing workaround Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 09/15] hpet/rtc: Rework RTC IRQ replacement by HPET Jan Kiszka
2010-05-25 9:29 ` Paul Brook
2010-05-25 10:23 ` Jan Kiszka
2010-05-25 11:05 ` Paul Brook
2010-05-25 11:19 ` Jan Kiszka
2010-05-25 11:23 ` Paul Brook
2010-05-25 11:26 ` Jan Kiszka
2010-05-25 12:03 ` Paul Brook
2010-05-25 12:39 ` Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 10/15] hpet: Drop static state Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 11/15] hpet: Add support for level-triggered interrupts Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 12/15] vmstate: Add VMSTATE_STRUCT_VARRAY_UINT8 Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 13/15] hpet: Make number of timers configurable Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 14/15] hpet: Add MSI support Jan Kiszka
2010-05-24 20:13 ` [Qemu-devel] [RFT][PATCH 15/15] monitor/QMP: Drop info hpet / query-hpet Jan Kiszka
2010-05-24 22:16 ` [Qemu-devel] [RFT][PATCH 00/15] HPET cleanups, fixes, enhancements Anthony Liguori
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