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Re: Why is my load ave so high now? [Now I know why!]

On 07/27/2009 02:26 PM, Rick Stevens wrote:
> You see a bunch of NFS-related things in a "D" state and you wonder why
> it's slow?

Yes.  Mostly because the machine accessing the NFS mounts has been
re-booted a couple of times.

> If you have processes in an I/O wait (a.k.a. "D") state, that'll bog
> stuff down badly...especially if the NFS mounts are mounted "hard".

Well, tonight I rebooted the server with NFS turned off.  When it
booted, I saw a load average between 1 and 2.  That's all.  When it
re-booted, ivtv started back up, despite my blacklisting it and removing
it from modprobe.conf.  However, ivtvfb did not get installed.
I also noticed that BOINC started right up again.  With astropulse
grabbing all the idle cpu time, my load average was still between 1 and 2.

So, I decided that NFS was my problem, but I'm still not sure why.

So, I tried a couple of things.  My laptop references a few directories
on my server via NFS and autofs.

So, I started nfs again on the server (service nfs start)

Load average remains between 1 and 2.  So far so good.

>From the laptop, I did a "cd /net/kjc386".  I can then do an ls and see
all of the exported filesystems.  Continues to look good.

"ls home" lists the directories in the server's exported /home dir.
nfs does the work, and disappears from the top -i that I have running.

Next I do a "ls c:" to look at the old WINDOWS partition on my server.
HANG!  I can't interrupt the ls with ^C nor ^Z.  I have to kill it from
another process.  When I do, the hung nfs processes on the server stay
hung.  After it collects all 8 allowed nfs processes, nothing more nfs
works to the server, and the load average climbs roughly 1 per nfs
process (I watched the load average increase with each new nfs process
that appeared).

So, I guess my question is what's broken with NFS between my F11 laptop
and the F10 server????

Kevin J. Cummings
kjchome rcn com
cummings kjchome homeip net
cummings kjc386 framingham ma us
Registered Linux User #1232 (http://counter.li.org)

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