Re: network traffic and cpu usage
Op donderdag 4 oktober 2007 20:52, schreef u:
> On 10/4/07, Rody <rody@xs4all.nl> wrote:
> > I'm trying to figure out why moving large files over nfs generates so
> > much cpu activity every few seconds. The progress dialog reaches speeds
> > my nic can't possibly support (over 20 MB/s) as my nic's are 100 Mbit,
> > then dropping back to zero and a few seconds later climbing up to the
> > same insane speed and back down again...
> >
> > I'd rather see my cpu usage at 10 - 20 % during the entire copy/move and
> > the progress dialog at 9-10 MB/s as I was used to on redhat9.
> >
> > I suspect it is some sort of cache that is filled every few seconds, but
> > I can't find where exactly. Maybe at kernel level? KDE?
> > Nic-configuration? I don't know, it doesn't look like it's related to
> > nfs-configuration like the mount options rsize and wsize, as these
> > settings don't seem to make a difference.
>
> I have a similar problem. When I copy files over NFS I also get a
> 20-25mb/s speed at first and then it slows down. Also CPU load is
> heavy. I have experienced this in both Debian Etch and in Ubuntu
> Feisty. I am using rsync, so I don't think it is KDE related.
> (although I am using KDE, but not using KDE for the file transfer)
Ok, judging from your experience with rsync, this means i can probably exclude
kde from my list of "suspects", leaving the kernel and the nic configuration
or driver as my targets for further investigation...
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