oeqa qemurunner: read more data at a time from serial

Use a short sleep to bundle serial console reads so that
we are not reading one character at a time which reduces busy
looping.

(From OE-Core rev: 62df87d3544b7fc3717743b131a62c6092359ec5)

Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
(cherry picked from commit cafe65d8cf7544edbd387f7f5f6d77c64c6b18fa)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/meta/lib/oeqa/utils/qemurunner.py b/meta/lib/oeqa/utils/qemurunner.py
index c68974f25c..3aeef19434 100644
--- a/meta/lib/oeqa/utils/qemurunner.py
+++ b/meta/lib/oeqa/utils/qemurunner.py
@@ -198,7 +198,7 @@ class QemuRunner:
         qmp_file = "." + next(tempfile._get_candidate_names())
         qmp_param = ' -S -qmp unix:./%s,server,wait' % (qmp_file)
         qmp_port = self.tmpdir + "/" + qmp_file
-        # Create a second socket connection for debugging use, 
+        # Create a second socket connection for debugging use,
         # note this will NOT cause qemu to block waiting for the connection
         qmp_file2 = "." + next(tempfile._get_candidate_names())
         qmp_param += ' -qmp unix:./%s,server,nowait' % (qmp_file2)
@@ -463,6 +463,8 @@ class QemuRunner:
                     socklist.remove(self.server_socket)
                     self.logger.debug("Connection from %s:%s" % addr)
                 else:
+                    # try to avoid reading only a single character at a time
+                    time.sleep(0.1)
                     data = data + sock.recv(1024)
                     if data:
                         bootlog += data