1424208 - Receiving is 0ms when timing a small TLS page

Status: NEW

(Core :: Networking: HTTP, defect, P3)

Description

[pea3nut]

Attachment: 微信图片_20171208183008.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20171128222554

Steps to reproduce:

Open console to timing in https://imququ.com/


Actual results:

Timing to how many time on page load in Firefox and Chrome, but got some different that see attach a file.


Expected results:

Maybe have some time to spend on page download? or Firefox has some magic can do that pre-load page before TLS connecting?

Comment 1

[Jan Honza Odvarko [:Honza] (always need-info? me)]

I don't understand what the issue is reported here.
Can you please provide more details?

Can you also test with Firefox 61?
https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly

Thanks!
Honza

Comment 2

[YF (Yang)]

(In reply to Jan Honza Odvarko [:Honza] from comment #1)
> I don't understand what the issue is reported here.
> Can you please provide more details?

I guess he is puzzled to Receiving = 0ms.

Comment 3

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Ah, I see. Yes, this looks weird. 

Thanks for clarification!

@Jan Bambas: is there any Necko explanation for having download time equal to 0?
(I can see it for many requests).

Honza

Comment 4

[pea3nut]

Attachment: firefox-bug-timing.png

Comment 5

[Honza Bambas (:mayhemer)]

Valentin may know better as he is behind the timing API impl.  See comment 3.

Comment 6

[Valentin Gosu [:valentin] (he/him)]

Thanks for the report. Always reproducible.
Assigning to myself.

Comment 7

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Thanks Valentin for looking into this!
Honza

Comment 8

[Valentin Gosu [:valentin] (he/him)]

Not actively working on this right now.