Comment 16 for bug 435137

I am having similar issue with ubuntuone-client, specifically with ubuntuone-syncd cpu usage spikes.
I have a single 2.7K file on ubuntuone. CPU usage jumps between 8%-40% continuously.
...
ubuntuone-client-1.0.3-0ubuntu1
...
python ubuntuone-client-diagnose.py
Checking your Ubuntu One client...
No issues were detected.
...
 ls -l .cache/ubuntuone/log/

-rw-r--r-- 1 user user 559362 2010-03-09 21:09 oauth-login.log
-rw-r--r-- 1 user user 1048445 2010-03-09 16:25 oauth-login.log.1
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log.2010-03-09_23-04-14
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log.2010-03-09_23-04-15
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log.2010-03-09_23-04-17
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log.2010-03-09_23-04-18
-rw-r--r-- 1 user user 1067 2010-03-09 23:04 syncdaemon-exceptions.log.2010-03-09_23-04-19
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log.2010-03-09_23-04-14
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log.2010-03-09_23-04-15
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log.2010-03-09_23-04-17
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log.2010-03-09_23-04-18
-rw-r--r-- 1 user user 2606 2010-03-09 23:04 syncdaemon.log.2010-03-09_23-04-19
...
cat .cache/ubuntuone/log/syncdaemon-exceptions.log
2010-03-09 23:05:22,607 - ubuntuone.SyncDaemon.Main - ERROR - Local rescan finished with error: Traceback: <type 'exceptions.KeyError'>: ('', 'None')
/usr/lib/python2.6/dist-packages/twisted/internet/defer.py:328:_runCallbacks
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/local_rescan.py:139:_process_next_queue
/usr/lib/python2.6/dist-packages/twisted/internet/defer.py:243:callback
/usr/lib/python2.6/dist-packages/twisted/internet/defer.py:312:_startRunCallbacks
--- <exception caught here> ---
/usr/lib/python2.6/dist-packages/twisted/internet/defer.py:328:_runCallbacks
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/local_rescan.py:77:_process_trash
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/filesystem_manager.py:1055:get_iter_trash
/usr/lib/python2.6/UserDict.py:110:iteritems
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/file_shelf.py:201:__getitem__
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/file_shelf.py:132:__getitem__
/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/file_shelf.py:124:_load_pickle