W3C home > Mailing lists > Public > public-web-perf@w3.org > August 2011

Re: [Resource Timing] Monotonic Clock

From: James Simonsen <simonjam@chromium.org>
Date: Tue, 16 Aug 2011 14:28:41 -0700
Message-ID: <CAPVJQik=R4AK48FZKgyh25ZKKfYNZz78qZMzWnSv3V8qFrumhw@mail.gmail.com>
To: public-web-perf <public-web-perf@w3.org>
Looks good to me. Thanks.

James

On Tue, Aug 16, 2011 at 1:29 PM, Jatinder Mann <jmann@microsoft.com> wrote:

>  Yes, Navigation Timing needs a similar update. I have gone ahead and
> updated the Monotonic Clock sections for both Resource Timing and Navigation
> Timing, like so:****
>
> ** **
>
> Resource Timing  Section 5.2 Monotonic Clock****
>
> The value of the timing attributes must monotonically increase to ensure
> timing attributes are not skewed by adjustments to the system clock while
> fetching the resource. The difference between any two chronologically
> recorded timing attributes must never be negative. For all resources,
> including subdocument resources, the user agent must record the system clock
> at the beginning of the root document navigation and define subsequent
> timing attributes in terms of a monotonic clock measuring time elapsed from
> the beginning of the navigation. ****
>
> ** **
>
> Navigation Timing  Section 5.3 The Monotonic Clock****
>
> The value of the timing attributes must monotonically increase to ensure
> timing attributes are not skewed by adjustments to the system clock during
> the navigation. The difference between any two chronologically recorded
> timing attributes must never be negative. For all navigations, including
> subdocument navigations, the user agent must record the system clock at the
> beginning of the root document navigation and define subsequent timing
> attributes in terms of a monotonic clock measuring time elapsed from the
> beginning of the navigation.****
>
> ** **
>
> ** **
>
> *From:* public-web-perf-request@w3.org [mailto:
> public-web-perf-request@w3.org] *On Behalf Of *James Simonsen
> *Sent:* Monday, August 15, 2011 7:14 PM
> *To:* public-web-perf
> *Subject:* Re: [Resource Timing] Monotonic Clock****
>
> ** **
>
> On Mon, Aug 15, 2011 at 4:52 PM, Jatinder Mann <jmann@microsoft.com>
> wrote:****
>
> Good point. If you want to create a timeline of the entire page, requiring
> iframes resources to have the same monotonic clock as the root navigation
> would be best. I can update the spec to be clear on this point also.****
>
> ** **
>
> Should we also do the same thing for NavigationTiming within the iframe? It
> seems like having one reference navigation time that's shared by everything
> on the page is best for the timeline.****
>
> ** **
>
> James ****
>
Received on Tuesday, 16 August 2011 21:29:14 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 18:01:09 UTC