[Intel-wired-lan] [PATCH iwl-next 2/3] ice: lower the latency of GNSS reads

Simon Horman horms at kernel.org
Fri Dec 13 11:54:38 UTC 2024


On Thu, Dec 12, 2024 at 04:34:16PM +0100, Michal Schmidt wrote:
> The E810 is connected to the u-blox GNSS module over I2C. The ice driver
> periodically (every ~20ms) sends AdminQ commands to poll the u-blox for
> available data. Most of the time, there's no data. When the u-blox
> finally responds that data is available, usually it's around 800 bytes.
> It can be more or less, depending on how many NMEA messages were
> configured using ubxtool. ice then proceeds to read all the data.
> AdminQ and I2C are slow. The reading is performed in chunks of 15 bytes.
> ice reads all of the data before passing it to the kernel GNSS subsystem
> and onwards to userspace.
> 
> Improve the NMEA message receiving latency. Pass each 15-bytes chunk to
> userspace as soon as it's received.
> 
> Tested-by: Miroslav Lichvar <mlichvar at redhat.com>
> Signed-off-by: Michal Schmidt <mschmidt at redhat.com>

Reviewed-by: Simon Horman <horms at kernel.org>



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