Testing response times to time.android.com from around the globe reveals
in ms:-
Europe <30
Middle East <68
North America <150
Johannesburg 183
Buenos Aires 220
Tokyo 226
Sydney 276
Hong Kong 285
Brisbane 295
Mumbai 349
Beijing 4691
Shanghai 4906
Russia n/a
Whilst time.android.com is NOT used for GPS NTP, North American time servers
are, by specifying north-america.pool.ntp.org as default in the framework,
to align with pixel devices. I am assuming similar response times to these
servers from around the world.
Great for North America and it appears Europe but it does not address the
global issue. Also, the pool.ntp.org project forbids both hardware and
software vendors from using these default zone names.
http://www.pool.ntp.org/en/vendors.html
It makes sense, therefore, to leverage the ntp.org's existing 'android' vendor
name to make the default ntp server for GPS purposes:
1.android.pool.ntp.org this will return a random but accurate NTP server in
close geopraphic proximity to the device.
Testing on my own build in the UK seems to improve hot and cold TTFF
considerably.
Change-Id: I144af45757efa35b32daf034eece6e046d2bde79
* XTRA_SERVERs are important, right? Like to get the almanac data
necessary for aGPS. Without the XTRA download, the chip needs to
collect sufficient navigation messages from the birds to compute
where they are in order to make sense of the ranging signals.
* Well, it seems that O doesn't like reading these entries from the
gps.conf file.
When in gps.conf:
GpsXtraDownloader: No XTRA servers were specified in the GPS configuration
When in overlay:
<that noise doesn't exist>
* This seems to, finally, return GPS fix performance to what we had
in N.
Change-Id: I70679835ec5dea053c5aa3750acee628906d6390
[haggertk]:
* During bring-up of O, GPS was exhibiting different behavior from
N -- an appropriate number of satellites would immediately lock,
but a fix would not resolve for 30-90 seconds. Digging up this
change from the L-era allows GPS to resolve a fix in a nominal
amount of time.
Change-Id: If9fd67483fedee915d46f7b9d2a7e0851400de3c
The current logging macro always uses LOGE, which is
confusing to external developer looking at our logs.
Also changed LOC_LOGx definition to follow the same
syntax as that of LOC_LOGX.
Bug: 29499503
Change-Id: I803233a9d0b241bf9aeb2ee0d4bd2e7cc52ed75b
CRs-Fixed: 1113702
Explicitly add liblog as dependency for modules that use Android
logging. Also remove obsolete build flag.
Change-Id: I91a458b44ff34c91a8f6875f5c3e931f620c613a
Removing statement to set LOCAL_CLANG flag explicity to
true. It will be true by default.
Change-Id: I2eaba5a89e64088e3383b962dceaaa7e975e997a
CRs-Fixed: 989476
gps: Correct forward declaration in proprietary definitions
Fix gps runtime error
The qcom prebuilt binary relies on FlpExtLocation_s,
so we cannot change it to FlpExtLocation.
This patch fixes it.
gps: fix remove trailing space
In setXtraUserAgent,
size_t is unsigned and never being negative.
Will cause segmentation fault, if string is all space.
Change-Id: I1cf1f956943b0739640afe909954ade6921e28a1
