Ubuntu
linux package

  1. Bug #620074
  2. Comment #287

Comment 287 for bug 620074

Revision history for this message
In , awebers (awebers-linux-kernel-bugs) wrote :

Hi again:

My test is to throttle the bandwith using "rsync --bwlimit=<throughput>"

I am testing using vmware on /images3.
Vmware runs fluent until I copy a lot (7Gig vmdk-file) to /images3, which
is a separat harddrive on which 5 vmware systems are having their .vmdk-files.
Copying this 7Gig file freezes the vmware systems for > 30 seconds.

And now with limited bandwith ...

all jobs run fine, no hangig or else:
rsync --bwlimit=10000 /images5/vmware/vlab03/STD_XP_Prof.vmdk /images3/test
rsync --bwlimit=20000 /images5/vmware/vlab03/STD_XP_Prof.vmdk /images3/test

some jobs start to become slow and hang:
rsync --bwlimit=30000 /images5/vmware/vlab03/STD_XP_Prof.vmdk /images3/test

a lot of jobs hangs and are very slow, some freeze:
rsync --bwlimit=40000 /images5/vmware/vlab03/STD_XP_Prof.vmdk /images3/test

This is my estimation:
rsync is creating more dirt than the "kernel" can get rid off and
the system is put into this "processes are blocked for writes" (see previous posting) mode.

I hope that my input can help.