RE: RE: [Opendlm-devel] Checkins to OGFS and ODLM

Thanks for all of that info.

I was going to start looking into CCCP, but it sounds like you've beaten
me to it (that's good!).

I'll keep following up on the opendlm lock module for OpenGFS ... I need
to figure out some things related to recovery/purges/etc.

And/or, is there somewhere else that I can be of some help??

-- Ben --=20

> -----Original Message-----
> From: [email protected]=20
> [mailto:[email protected]] On Behalf=20
> Of Zickus II, Don
> Sent: Friday, April 02, 2004 10:22 AM
> To: [email protected]
> Cc: [email protected]
> Subject: [ogfs-dev]RE: [Opendlm-devel] Checkins to OGFS and ODLM
>=20
>=20
> Actually that is not entirely true.  One of the big culprits=20
> is the CCCP
> module.  The timer functionality is completely broken and winds up
> sending an ACK every clock tick, even when both nodes are sitting idle
> doing nothing.  As a result it chews up memory and CPU ("cat
> /proc/slabinfo" and look for cccp).  We have a fix for this, which
> removes the "timer cache" and utilizes a single timer that=20
> turns on and
> off properly.  In addition, our throughput went up and our soak tests
> didn't die after 24 hours anymore. =20
>=20
> We have a collection of other fixes that we will be submitting in
> another week or so, once we move past our beta deadline.  These fixes
> include the cccp timer, cccp duplicate packet issue (might be=20
> the cause
> of your dir_proc crash), deadlock fixes, migration works again (albeit
> performance is horrible), startup/shutdown cleanups, and other misc
> fixes. =20
>=20
> Thanks again Ben for checking in our first patch.  Hopefully=20
> we will be
> able to fix things over here so we can check-in the second=20
> patch (after
> the community accepts it of course ;) ).=20
>=20
> Best Regards,
> Don
> =20
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Aneesh
> Kumar KV
> Sent: Friday, April 02, 2004 8:52 AM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: [Opendlm-devel] Checkins to OGFS and ODLM
>=20
> Cahill, Ben M wrote:
>=20
> >
> >Does anyone know why there is *so much LAN traffic* with=20
> OpenDLM?  This
> >doesn't seem right.  It should be more efficient (less traffic) than
> >memexp, at least when a lock is not immediately available=20
> (memexp just
> >keeps spinning, but OpenDLM should not need to do that, should it?)
> ....
> >
> >
> >...  But my LAN LEDs keep lighting up *very actively* long after any
> >filesystem activity is complete, and it takes longer to do filesystem
> >stuff with OpenDLM (vs. memexp).  Hmmm, I'm hoping that there's a
> pretty
> >serious breach of logic in the OpenDLM code that we can clean up.
> > =20
> >
>=20
> If you look at openDLM list archive you will find a smillar=20
> discussion=20
> regarding openDLM and lan traffic. IIRC it is the locking=20
> architecture=20
> of OpenDLM the culprit.
>=20
> -aneesh
>=20
>=20
> --=20
> ph: 603-884-5742
>=20
>=20
>=20
>=20
> -------------------------------------------------------
> This SF.Net email is sponsored by: IBM Linux Tutorials
> Free Linux tutorial presented by Daniel Robbins, President and CEO of
> GenToo technologies. Learn everything from fundamentals to system
> =
administration.http://ads.osdn.com/?ad_id=3D1470&alloc_id=3D3638&op=3Dcli=
ck
> _______________________________________________
> Opendlm-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/opendlm-devel
>=20
>=20
>=20
>=20
>=20
> -------------------------------------------------------
> This SF.Net email is sponsored by: IBM Linux Tutorials
> Free Linux tutorial presented by Daniel Robbins, President and CEO of
> GenToo technologies. Learn everything from fundamentals to system
> administration.http://ads.osdn.com/?ad_id=1470&alloc_id638&op=3Dick
> _______________________________________________
> Opengfs-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/opengfs-devel
>=20


-------------------------------------------------------
This SF.Net email is sponsored by: IBM Linux Tutorials
Free Linux tutorial presented by Daniel Robbins, President and CEO of
GenToo technologies. Learn everything from fundamentals to system
administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click