[PL #2899] CKRM memory controller hangs

[sekharan at us.ibm.com via RT]

Email Recipients (see http://www.planet-lab.org/Support)
       Requestor: acb at cs.princeton.edu
       Ticket Ccs: acb at cs.princeton.edu, frankeh at watson.ibm.com, mef at cs.princeton.edu, sekharan at us.ibm.com

==================================================

On Thu, Nov 04, 2004 at 03:27:19PM -0500, Marc E. Fiuczynski via RT wrote:
> Chandra,
> 
> > PS2: Did you try drop/grab lock yet ?
> 
> Yes. It seemed to prevent the problem of losing TSC ticks. However, when the system needs to go off and swap, it does so rather heavily and makes system usage rather choppy. I.e., things appear to stop for a while but then it comes back.
> 
> > Can you try these two options and see if the memory hang problem is any
> > better.
> 
> Will give this a shot, but...
> 
> > I haven't tested the above solution 
> 
> ... what do you mean by that?

i did not test the suggestions. will do it this afternoon...
> 
> Marc
> 
> 
> > -----Original Message-----
> > From: sekharan at us.ibm.com via RT [mailto:devel at planet-lab.org]
> > Sent: Thursday, November 04, 2004 2:38 PM
> > To: acb at CS.Princeton.EDU
> > Subject: Re: [PL #2899] CKRM memory controller hangs
> > 
> > 
> > Email Recipients (see http://www.planet-lab.org/Support)
> >        Requestor: acb at cs.princeton.edu
> >        Ticket Ccs: acb at cs.princeton.edu, frankeh at watson.ibm.com, 
> > mef at cs.princeton.edu, sekharan at us.ibm.com
> > 
> > ==================================================
> > 
> > Marc,
> > 
> > Can you try these two options and see if the memory hang problem is any
> > better.
> > 
> > 1. in the while loop in refill_inactive_zone, change "pgmoved++" to
> >    "zone->nr_active--" and delete "zone->nr_active -= pgmoved" which is
> >    outsise the loop.
> > 
> > 2. enable CONFIG_CKRM_MEM_LRUORDER_CHANGE in your kernel.
> > 
> > chandra
> > PS1: I could reproduce the problem in my machine with "memtest.sh 
> > 10 100", I
> > haven't tested the above solution or the other solution(dropping and
> > regrabbing the lock) yet.
> > PS2: Did you try drop/grab lock yet ?
> > 
> 
> 

-- 

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    Chandra Seetharaman               | Be careful what you choose....
              - sekharan at us.ibm.com   |      .......you may get it.
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