Bug 80018: NFSv4 on RHEL 6.2 over six times slower than 5.7

[Tom Curl]

Good answer Corey! 

On Tue, 2012-07-10 at 21:47 -0600, Corey Kovacs wrote:
> TAM = Technical Account Manager.
> 
> I asked about auditing and you asked about selinux auditing. Since when is
> selinux auditing? I mean the auditd daemon. It can tax the system severely
> if not set up correctly.
> 
> I asked about your exports file, you give me the format for a generic
> exports file. If you didn't notice, i am an RHCA. I think I know what the
> general format is.
> 
> I asked about kerberos, you said you didn't know..  how can you NOT know if
> you are using kerberos?
> 
> I asked you to give us something to work with. You said "read the damn
> bug". I did, it's so fricking vague it's ridiculous.
> 
> You seem to have very little information/knowledge of your system which
> isn't too surprising at this point.
> 
> So, you seem to have decided to be very unproessional about this, so I say
> good luck. I will not respond to you again. I can only hope others don't
> either.
> 
> 
> Have fun....
> 
> 
> On Tue, Jul 10, 2012 at 8:47 PM, mark <m.roth at 5-cent.us> wrote:
> 
> > On 07/10/12 20:41, Corey Kovacs wrote:
> >
> >> Well, looking at the Bugzilla, it looks like they are asking you to
> >> contact
> >> your support rep. If you are working in the government, there will be a
> >> TAM
> >>
> >
> > I'm waiting for my manager to tell me how to file. I have no idea what a
> > TAM is - we do all this ourselves.
> >
> >
> >  assigned to handle these problems. If you are a contractor working on
> >> systems to be delivered to the government, then you need to be a paying
> >> customer to expect support from Red Hat. Especially when your original
> >> problem manifested on CentOS. Granted, it's the same code base, but that
> >> doesn't make your problem on CentOS, a problem for Red Hat.
> >>
> >
> > I'll say it one more time: we found the problem on CentOS. We went to our
> > test RHEL system. Updated it. Exported a directory *from* the RHEL box to
> > itself, to /mnt/foo, and ran the test, and got the same results.
> >
> > In fact, I ran it twice today, updating the kernel in between, and with
> > 6.3, it's taking a consistent 7.5 min, instead of the 6.5 we were getting
> > with 6.2
> > <snip>
> >
> >  Now, all that said and done, here are some questions for you which might
> >> help us figure what would help.
> >>
> >> 1. What options are present on the mount? (cat /proc/mounts, thinks like
> >> sync can be a problem)
> >>
> >
> > I"m not at work. I'll have to answer that in the morning. I will tell you
> > that when we were first trying to figure it out, two months ago, I did try
> > no sync.
> >
> >
> >  2. What does your /etc/exports config look like on your server node (cat
> >> /etc/exports)
> >>
> >
> > /scratch/foo <servername>: options
> >
> >
> >  3. You are using NFSv4, are you using Kerberos with it?
> >>
> >
> > I don't believe we have kerborous set with NFS. We do use it for other
> > things.
> >
> >
> >       3.a. If so, what mode are you using for your gss/krb flag? (krb5,
> >> krb5i, krb5p)
> >> 4. What's your network speed? Are you sure? (ethtool ethX to make sure)
> >>
> >
> > Gigabit.
> >
> >  5. Selinux?
> >>
> > Permissive.
> >
> >  6. Auditing?
> >>
> >
> > Do you mean selinux auditing? As I said, doing it on the local drive takes
> > seconds. Doing it from a 5.x NFS server takes about 1.5 min. Therefore,
> > there's nothing that could affect it on the one server.
> >
> >
> >  7. How many clients are hitting your server and how many nfsd threads are
> >> you running on it?
> >>
> >
> > No other clients. This is a test system.
> >
> >
> >> This is by no means an exhaustive list of things to look at.
> >>
> >> Anyway, in order to get any real help, you cannot just shout out, "My
> >> stuff
> >> is broke, it's Red Hat's fault, no one will listen to me!"
> >>
> >> Give us something to work with.
> >>
> >
> > Try reading the damn bug.
> >
> >
> >
> >> By the way, in looking at the responses to your bugzilla, it doesn't look
> >> to me like they were shamed into responding. It looks like are telling you
> >> to go through proper channels if they exist. full stop.
> >>
> >
> > No, they gave *ZERO* responses until today. The one and only response
> > before today was, "oh, we're up to 6.3, we'll not even look at it".
> >
> > And my manager, who's a fed, and I, a contractor, along with the other
> > admin under him, who is also a contractor, handle the licenses, etc, so
> > there's no one else to wait for.
> >
> >
> >         mark
> >
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