[K12OSN] How to DRASTICALLY speed up app response on K12LTSP

["Terrell Prudé Jr."]

Robert Arkiletian wrote:
> Also, a couple things I would add for better performance
>
> Add the noatime mount option to your drive partitions (or md devices)
> in /etc/fstab
> I don't think schools are so concerned about security that we need to
> know when each file is accessed.
>
>   
Hmm...good idea here.

> Also check
> dmesg | grep scheduler
> make sure you are using the cfq i/o scheduler
>
>   
That's the default on my system, and I'm using 4.2EL.  I'm not sure what
the default is in Fedora.

> here is an explanation of i/o scheduler options
> http://www.redhat.com/magazine/008jun05/features/schedulers/
>   
Yo, man, you tryin' to fry my brain here?  :-)

Actually, for K12LTSP servers, it appears from this article that the
Anticipatory (AS) scheduler might be even better for high-interactive,
e. g. desktop, performance issues.  Red Hat did their tests with an
Oracle 10G task requiring lots and lots of disk I/O.  Of course, if the
K12LTSP server also serves double-duty as a major file server for the
LAN (e. g. Samba or NFS), then CFQ might be the better overall bet.

As always, it all depends on what kind of load you're running on the box.

--TP