From: Anthony Liguori <aliguori@us.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 18/21] Remove host_alarm_timer hacks.
Date: Thu, 30 Apr 2009 08:37:01 -0500 [thread overview]
Message-ID: <49F9A97D.7050004@us.ibm.com> (raw)
In-Reply-To: <49F9A6BA.5040702@redhat.com>
Avi Kivity wrote:
> Anthony Liguori wrote:
>> In modern KVM, the IO thread is capable of interrupting the CPU
>> whenever it needs to process IO. Therefore this "problem" no longer
>> exists.
>>
>
> It would still be good to verify that the problem no longer exists.
> This is not a cosmetic change; some testing is needed to verify it
> doesn't introduce new latencies.
>
N.B. dynticks is the preferred timer in QEMU on Linux. To even hit this
code path, you'd have to use an explicit -clock hpet or -clock rtc. I
don't have an hpet on my laptop and -clock rtc boots just as fast as it
did before.
Do we really care about optimizing latency with -clock rtc though?
--
Regards,
Anthony Liguori
next prev parent reply other threads:[~2009-04-30 13:37 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-29 21:20 [PATCH 0/21] Remove merge artifacts from qemu-kvm Anthony Liguori
2009-04-29 21:20 ` [PATCH 01/21] Remove memalign call for guess_disk_lchs Anthony Liguori
2009-04-29 21:20 ` [PATCH 02/21] Remove devfn from BlockDriverState Anthony Liguori
2009-04-29 21:20 ` [PATCH 03/21] Remove use of signalfd in block-raw-posix.c Anthony Liguori
2009-04-30 9:28 ` Avi Kivity
2009-04-30 12:54 ` Anthony Liguori
2009-04-30 13:05 ` Avi Kivity
2009-04-30 13:28 ` Anthony Liguori
2009-04-30 13:36 ` Avi Kivity
2009-05-03 16:48 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 04/21] Remove stray whitespace Anthony Liguori
2009-04-29 21:20 ` [PATCH 05/21] Remove extra call to kvm_cpu_exec() Anthony Liguori
2009-04-29 21:20 ` [PATCH 06/21] Remove dead functions from cutils Anthony Liguori
2009-04-29 21:20 ` [PATCH 07/21] Remove dead macros likely/unlikely in exec.c Anthony Liguori
2009-04-29 21:20 ` [PATCH 08/21] Remove leftovers in device-hotplug.c Anthony Liguori
2009-04-29 21:20 ` [PATCH 09/21] Remove unnecessary setting of cmos smp_cpu count Anthony Liguori
2009-04-29 21:20 ` [PATCH 10/21] Remove IBM copyright in unmodified file in upstream Anthony Liguori
2009-04-29 21:38 ` Hollis Blanchard
2009-04-29 21:20 ` [PATCH 11/21] Remove unused variables in vga.c Anthony Liguori
2009-04-30 9:33 ` Avi Kivity
2009-04-30 13:09 ` Anthony Liguori
2009-04-29 21:20 ` [PATCH 12/21] Remove odd hack " Anthony Liguori
2009-04-30 9:39 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 13/21] Remove virtio-console PIF change Anthony Liguori
2009-04-30 9:40 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 14/21] Remove -cpu-vendor-string Anthony Liguori
2009-04-30 9:41 ` Avi Kivity
2009-04-30 13:10 ` Anthony Liguori
2009-04-30 13:16 ` Avi Kivity
2009-04-30 13:26 ` Anthony Liguori
2009-04-30 13:33 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 15/21] Remove defined(TARGET_X86_64) Anthony Liguori
2009-04-29 21:20 ` [PATCH 16/21] Remove clean rule change Anthony Liguori
2009-04-30 9:42 ` Avi Kivity
2009-04-30 15:10 ` Hollis Blanchard
2009-04-30 15:13 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 17/21] Remove #define __user in usb-linux.c Anthony Liguori
2009-04-30 9:43 ` Avi Kivity
2009-04-30 13:11 ` Anthony Liguori
2009-04-30 13:17 ` Avi Kivity
2009-04-30 13:20 ` Anthony Liguori
2009-04-29 21:20 ` [PATCH 18/21] Remove host_alarm_timer hacks Anthony Liguori
2009-04-30 9:44 ` Avi Kivity
2009-04-30 13:19 ` Anthony Liguori
2009-04-30 13:25 ` Avi Kivity
2009-04-30 13:37 ` Anthony Liguori [this message]
2009-04-30 15:46 ` Avi Kivity
2009-04-30 15:49 ` Anthony Liguori
2009-04-30 15:53 ` Avi Kivity
2009-04-29 21:20 ` [PATCH 19/21] Use QEMU_PKGVERSION to declare kvm-devel Anthony Liguori
2009-04-29 21:20 ` [PATCH 20/21] Get rid of qemu_get_launch_info() Anthony Liguori
2009-04-29 21:20 ` [PATCH 21/21] Leave upstream QEMU comments intact Anthony Liguori
2009-04-30 9:50 ` [PATCH 0/21] Remove merge artifacts from qemu-kvm Avi Kivity
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