tree f00d6cd705877b1110880ff54b62d5f4f02f4ba1
parent e9fdf4a9fafc7e8d27088b3fca1839f7b6bfc0b1
author Josh Gao <jmgao@google.com> 1583459933 -0800
committer Josh Gao <jmgao@google.com> 1583466491 -0800

adb: defer acknowledgement of pushed files until the end.

Previously, we were waiting for the other end to respond after every
file sent, which results in massive slowdown when there's any amount of
latency on the transport.

This improves performance on a cuttlefish instance with ~7ms RTT from:

    system/: 2037 files pushed, 0 skipped. 2.8 MB/s (762803979 bytes in 262.964s)

to:

    system/: 2037 files pushed, 0 skipped. 11.9 MB/s (762803979 bytes in 61.278s)

Bug: https://issuetracker.google.com/150827486
Test: ./test_device.py
Change-Id: I3a0c893faa5d455cc6ccbc86915a17e1b5abbfbe