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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: thibodux@gmail.com, xen-devel@lists.xenproject.org,
	linux-kernel@vger.kernel.org
Cc: oleksandr_andrushchenko@epam.com, tglx@linutronix.de,
	jgross@suse.com, ryan.thibodeaux@starlab.io
Subject: Re: [PATCH] x86/xen: Add "xen_timer_slop" command line option
Date: Wed, 24 Apr 2019 14:47:22 -0400	[thread overview]
Message-ID: <63b5cb73-ad62-22b3-8df3-da75d4f3e358@oracle.com> (raw)
In-Reply-To: <1553279397-130201-1-git-send-email-ryan.thibodeaux@starlab.io>

On 3/22/19 2:29 PM, thibodux@gmail.com wrote:
> From: Ryan Thibodeaux <ryan.thibodeaux@starlab.io>
>
> Add a new command-line option "xen_timer_slop=<INT>" that sets the
> minimum delta of virtual Xen timers. This commit does not change the
> default timer slop value for virtual Xen timers.
>
> Lowering the timer slop value should improve the accuracy of virtual
> timers (e.g., better process dispatch latency), but it will likely
> increase the number of virtual timer interrupts (relative to the
> original slop setting).
>
> The original timer slop value has not changed since the introduction
> of the Xen-aware Linux kernel code. This commit provides users an
> opportunity to tune timer performance given the refinements to
> hardware and the Xen event channel processing. It also mirrors
> a feature in the Xen hypervisor - the "timer_slop" Xen command line
> option.
>
> Signed-off-by: Ryan Thibodeaux <ryan.thibodeaux@starlab.io>


Applied to for-linus-5.2

WARNING: multiple messages have this Message-ID (diff)
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: thibodux@gmail.com, xen-devel@lists.xenproject.org,
	linux-kernel@vger.kernel.org
Cc: jgross@suse.com, ryan.thibodeaux@starlab.io, tglx@linutronix.de,
	oleksandr_andrushchenko@epam.com
Subject: Re: [Xen-devel] [PATCH] x86/xen: Add "xen_timer_slop" command line option
Date: Wed, 24 Apr 2019 14:47:22 -0400	[thread overview]
Message-ID: <63b5cb73-ad62-22b3-8df3-da75d4f3e358@oracle.com> (raw)
In-Reply-To: <1553279397-130201-1-git-send-email-ryan.thibodeaux@starlab.io>

On 3/22/19 2:29 PM, thibodux@gmail.com wrote:
> From: Ryan Thibodeaux <ryan.thibodeaux@starlab.io>
>
> Add a new command-line option "xen_timer_slop=<INT>" that sets the
> minimum delta of virtual Xen timers. This commit does not change the
> default timer slop value for virtual Xen timers.
>
> Lowering the timer slop value should improve the accuracy of virtual
> timers (e.g., better process dispatch latency), but it will likely
> increase the number of virtual timer interrupts (relative to the
> original slop setting).
>
> The original timer slop value has not changed since the introduction
> of the Xen-aware Linux kernel code. This commit provides users an
> opportunity to tune timer performance given the refinements to
> hardware and the Xen event channel processing. It also mirrors
> a feature in the Xen hypervisor - the "timer_slop" Xen command line
> option.
>
> Signed-off-by: Ryan Thibodeaux <ryan.thibodeaux@starlab.io>


Applied to for-linus-5.2

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  parent reply	other threads:[~2019-04-24 18:48 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-22 18:29 [PATCH] x86/xen: Add "xen_timer_slop" command line option thibodux
2019-03-22 22:10 ` Boris Ostrovsky
2019-03-23  2:58   ` Dario Faggioli
2019-03-23  2:58   ` Dario Faggioli
2019-03-23 10:41     ` luca abeni
2019-03-25 12:05       ` luca abeni
2019-03-25 13:43         ` Boris Ostrovsky
2019-03-25 14:07           ` luca abeni
2019-03-25 14:07           ` luca abeni
2019-03-25 14:11           ` Ryan Thibodeaux
2019-03-25 17:36             ` Ryan Thibodeaux
2019-03-25 17:36             ` Ryan Thibodeaux
2019-03-25 18:31             ` Boris Ostrovsky
2019-03-25 18:31             ` Boris Ostrovsky
2019-03-25 14:11           ` Ryan Thibodeaux
2019-03-26  9:13           ` Dario Faggioli
2019-03-26  9:13           ` Dario Faggioli
2019-03-26 11:12             ` luca abeni
2019-03-26 11:41               ` Ryan Thibodeaux
2019-03-26 11:41               ` Ryan Thibodeaux
2019-03-26 11:12             ` luca abeni
2019-03-26 23:21             ` Boris Ostrovsky
2019-03-27 10:00               ` Ryan Thibodeaux
2019-03-27 10:00               ` Ryan Thibodeaux
2019-03-27 14:46                 ` Boris Ostrovsky
2019-03-27 14:59                   ` Ryan Thibodeaux
2019-03-27 14:59                   ` Ryan Thibodeaux
2019-03-27 15:19                   ` Dario Faggioli
2019-03-27 15:19                   ` Dario Faggioli
2019-03-27 14:46                 ` Boris Ostrovsky
2019-03-26 23:21             ` Boris Ostrovsky
2019-03-25 13:43         ` Boris Ostrovsky
2019-03-25 12:05       ` luca abeni
2019-03-23 10:41     ` luca abeni
2019-03-23 12:00   ` Ryan Thibodeaux
2019-03-23 12:00     ` Ryan Thibodeaux
2019-03-24 18:07     ` Boris Ostrovsky
2019-03-24 18:07     ` Boris Ostrovsky
2019-03-25 10:36       ` Dario Faggioli
2019-03-25 10:36       ` Dario Faggioli
2019-03-22 22:10 ` Boris Ostrovsky
2019-04-24 18:47 ` Boris Ostrovsky [this message]
2019-04-24 18:47   ` [Xen-devel] " Boris Ostrovsky
2019-04-24 18:47 ` Boris Ostrovsky
  -- strict thread matches above, loose matches on Subject: below --
2019-03-22 18:29 thibodux

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