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Re: XFS, 4K stacks, and Red Hat

To: Joshua Baker-LePain <jlb17@xxxxxxxx>
Subject: Re: XFS, 4K stacks, and Red Hat
From: Net Llama! <netllama@xxxxxxxxxxxxx>
Date: Thu, 7 Jul 2005 11:00:11 -0500 (EST)
Cc: Steve Lord <lord@xxxxxxx>, Linux xfs mailing list <linux-xfs@xxxxxxxxxxx>
In-reply-to: <Pine.LNX.4.58.0507071142550.4766@xxxxxxxxxxxxxxxxxx>
References: <Pine.LNX.4.58.0507071102460.4766@xxxxxxxxxxxxxxxxxx> <42CD4D38.1090703@xxxxxxx> <Pine.LNX.4.58.0507071142550.4766@xxxxxxxxxxxxxxxxxx>
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On Thu, 7 Jul 2005, Joshua Baker-LePain wrote:
> On Thu, 7 Jul 2005 at 10:41am, Steve Lord wrote
> > Joshua Baker-LePain wrote:
> > > Can anyone summarize the current status of XFS and 4K stacks?  There was
> > > recently a thread[1] on the nahant (RHEL4) mailing list where it was
> > > stated[2] that one reason for the exclusion of XFS in RHEL4 is the stack
> > > size issue.  I'd love to see XFS in Red Hat, although of course I have no
> > > idea if they'd turn it on even if the stack size issues went away
> > > tomorrow.  I'm just wondering what the view of this is from the SGI side.
> > >
> > > Thanks.
> > >
> > >
> > > [1] https://www.redhat.com/archives/nahant-list/2005-June/msg00280.html
> > >
> > > [2] https://www.redhat.com/archives/nahant-list/2005-June/msg00304.html
> > >
> > I have my suspicions that they could find another reason if this one was
> > not present - code is too complex, they have no expertise for support....
> Oh, I share those same suspicions.  The only reason I pointed at that post
> is that it's the first time I've heard anything from them other than "XFS
> doesn't provide anything not provided by ext3".  Note that I was ignored
> in the same thread after proving that RHEL4's dump for ext3 ignores
> EAs/ACLs.
> > As for XFS and a 4K stack, I think it still boils down to a few edge cases,
> > I have not seen one in years, I am doing all my builds via nfs v3 with
> > tcp/ip to an XFS filesystem.
> >
> > The only stack overflow I have seen recently has been attempting to get
> > device mapper multipath to work, I can make that overflow the stack just
> > trying to configure it.
> Hrm.  I was easily able to trigger stack overflows on a pretty simple
> (albeit old) setup -- RHEL4 kernel with XFS turned on, dual PIII 450,
> 384MB RAM, XFS on a single SCSI disk on aic7xxx.
> > Steve (who has an attitude problem this morning)
> Rather understandable given the subject -- sorry to poke you with this
> particular stick.

Its worse than this too.  Fedora Core ships with native XFS support.
Unfortunately, Redhat pretends like its not there.  When I submitted a bug
a few days ago against grub failing to work during OS installation it was
closed as WNF because 'XFS is unsupported'.  I questioned why they were
shipping a kernel with XFS and even the xfs-progs RPM if XFS is
unsupported, but I doubt I'll get a response.

Lonni J Friedman                        netllama@xxxxxxxxxxxxx
LlamaLand                               http://netllama.linux-sxs.org

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