On Thu, Apr 24, 2008 at 1:13 AM, Gavin McCullagh <[EMAIL PROTECTED]>
wrote:
> Hi,
>
> On Tue, 22 Apr 2008, David Burgess wrote:
>
> > I have 4 thin clients booting pxe on realtek 10/100 onboards through an
> > unmanaged netgear prosafe gigabit switch. If I run a youtube video on one
> > client, video and audio are reasonably smooth. If I play the same youtube
> > video on all 4 clients simultaneously the video gets much slower. If I
> > full-screen a couple of those then the audio starts to break up. For this
> > reason I'm fairly confident that this rules out the thin client hardware;
> it
> > must be a bottleneck in the server or network, right?
>
> If moving to full screen makes things worse (as opposed to more obviously
> bad), then it sounds like you have an issue with local network bandwidth.
>
> In fairness, full screen video on thin clients is probably not ever likely
> to work well. The number of full screen refreshes per second is simply too
> high. Can you play a single client full screen satisfactorily?
>
> > That leaves the network. It's tough to say what my network usage is
> exactly
> > because my intel cards insist on reporting bandwidth usage as a sine wave
> in
> > gnome (http://ubuntuforums.org/showthread.php?t=750910), but a single
> client
> > peaks around 10 MB/s while all 4 running at default size or full-screen
> > peaks about 28MB/s, suggesting a mean throughput of about 14 MB/s or so
> on
> > both interfaces.
>
> I'd suggest you set up munin on the server. You can then monitor the
> server network card usage.
>
>
> http://www.ubuntugeek.com/monitoring-servers-and-clients-using-munin-in-ubuntu.html
>
> http://www.ubuntux.org/monitoring-servers-and-clients-using-munin-in-debian-linux
>
> > So am I stuck at 100mbps on my client network? Why would this be when my
> > switch indicates 1000mbps to the server, and ethtool agrees?
>
> Each thin client should be limited to 100Mb. That may be the bottleneck
> playing full screen video.
>
> > Is there some other bottleneck happening here that I'm overlooking?
>
> Perhaps the video rendering on the thin client could be a problem too --
> though they shouldn't affect each other in that. Have you looked at the
> cpu usage on them.
Thanks, I'll try your suggestions. How do I monitor cpu usage on a cient?
db
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