<div dir="ltr">Just a sudden thought... might a NIC be mis-set to a slow speed, causing all sorts of funky backups, mis-queueing, context-switching, etc...?</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jan 23, 2015 at 4:00 PM, Jordan Erickson <span dir="ltr"><<a href="mailto:jerickson@logicalnetworking.net" target="_blank">jerickson@logicalnetworking.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Can you give us a bit more detail as to your network/server setup? You<br>
say you're running 24cpus and 128gigs. Might be a logical explanation to<br>
house NFS on its own server.. What's your network speed? Thin (or fat)<br>
client specs? Distro?<br>
<br>
<br>
Cheers,<br>
Jordan<br>
<div class="HOEnZb"><div class="h5"><br>
<br>
On 01/23/2015 03:52 PM, <a href="mailto:gandalf@sonic.net">gandalf@sonic.net</a> wrote:<br>
> It's actually a NFS to a separate server. I'm not sure why it was done<br>
> that way. To me this would probably further congest the network while<br>
> not being nearly as fast as a high performance direct disk interface.<br>
><br>
> On 2015-01-23 15:00, Omar Eljumaily wrote:<br>
>> Not speaking from experience with LTSP server, but my guess would be<br>
>> that it is a disk io bottleneck.<br>
>><br>
>> <a href="http://stackoverflow.com/questions/21617500/understanding-load-average-vs-cpu-usage" target="_blank">http://stackoverflow.com/questions/21617500/understanding-load-average-vs-cpu-usage</a><br>
>><br>
>><br>
>> I believe that web browsers cache on disk most of their content and<br>
>> media before rendering it. That's a lot of users hitting a single<br>
>> disk drive or array. Do you have a large RAID array? SSD?<br>
>><br>
>> Omar<br>
>><br>
>> On 1/23/2015 2:19 PM, <a href="mailto:gandalf@sonic.net">gandalf@sonic.net</a> wrote:<br>
>>><br>
>>> I'm seeing very high load averages with low CPU usage. The two main<br>
>>> culprits are chrome and firefox. I've got about a hundred users<br>
>>> sharing the LTSP server which has some rich resources (24cpus and<br>
>>> 128gigs).<br>
>>><br>
>>><br>
>>><br>
>>><br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">"When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up." -CS Lewis</div>
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