mirror of
https://github.com/Telecominfraproject/OpenCellular.git
synced 2025-12-30 18:41:11 +00:00
ed971ed82e
We have hard timing requirements once we begin to output our host command response, and most of the time is spent copying our response to OBUF. Optimize our copy loops to remove needless increments and to avoid needless struct dereference. BUG=chrome-os-partner:61304 BRANCH=gru TEST=Manual on kevin, verify the following performance metrics: Time spent in shi_fill_out_status(): Was 40us, now 28us Time spent in shi_write_half_obuf(): Was 60us, now 31us Time spent in shi_write_first_pkg_outbuf: Was 90us, now 37us (bad case) Was 26us, now 16us (better case / less data copied) Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I04075c92744eeefe8f2be009e6598718c45143c4 Reviewed-on: https://chromium-review.googlesource.com/425330 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly