Latest FC kernel still have SMP bugs?

[Chris Miller]

37700 mount/unmount and still going.   I will let it run on my test box
here at my office.  And give a update to my findings.  But let me ask
you what file system do you use on your boxs?

On Thu, 2004-04-01 at 19:21, Norman Gaywood wrote:
> On Thu, Apr 01, 2004 at 04:31:57PM -0500, Chris Miller wrote:
> > On Thu, 2004-04-01 at 09:48, Mitch Wiedemann wrote:
> > > Is the FC1 2.4.22-1.2174.nptl kernel still having problems with SMP and 
> > > hanging?
> > 
> > I run around 100 SMP servers with no problem.  
> > 
> > Hardware.
> > Dual Xeon servers with HT on supermicro server boards.
> > Dual AMD on Tyan 2469,2468,2462
> > Dual Opteron on Tyan 2880
> > 
> > And I do run the fedora kernel.  Anything I can do to help let me know. 
> > But I have never seen any of the problems anyone is talking about.
> 
> I'd be interested if you could run the script from:
> 
> http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=109962#c40
> 
> and see how you go. The script creates a small file in /tmp, makes a
> filesystem image out of that file, and then continuously does a
> loop-back mount/umount until you get sick of it and ^C out.
> 
> Any FC1 SMP kernel I have used on several types of systems, including
> AMD single processor systems running the athlon SMP kernel, will lockup
> in less than 500 mount/umounts. Usually much faster.
> 
> Other kernels can do mount/umounts for as long as you want. I've gone
> upto 20,000 before I ^C out.
> 
> This is the script:
> 
> #!/bin/sh
> 
> NAME="hangemhi"
> SIZE=6000
> 
> MNTPOINT=/tmp/${NAME}
> IMAGE=/tmp/${NAME}.img
> 
> echo Creating something to mount
> dd if=/dev/zero of=${IMAGE} bs=1k count=${SIZE}
> mke2fs -F -q ${IMAGE} ${SIZE}
> 
> echo Creating the mount point
> mkdir -p ${MNTPOINT}
> 
> echo Now doing mount/umount until the system hangs
> COUNT=1
> while true
> do
>   echo -en ${COUNT} "\r"
>   mount -r -o loop -t ext2 ${IMAGE} ${MNTPOINT}
>   umount ${MNTPOINT}
>   COUNT=`expr ${COUNT} + 1`
> done
> 
> 
> -- 
> Norman Gaywood, Systems Administrator
> School of Mathematics, Statistics and Computer Science
> University of New England, Armidale, NSW 2351, Australia
> 
> norm at turing.une.edu.au            Phone: +61 (0)2 6773 2412
> http://turing.une.edu.au/~norm    Fax:   +61 (0)2 6773 3312
> 
> Please avoid sending me Word or PowerPoint attachments.
> See http://www.fsf.org/philosophy/no-word-attachments.html
>