[Lustre-discuss] Lustre featured on podcast (HT: Andreas Dilger)

[Andreas Dilger]

On Aug 03, 2009  22:33 -0400, Mag Gam wrote:
> its really bizzare because you can read all the manuals in the world
> and read all the responses on the mailing list, but 30 mins of a good
> developers time is priceless. I never even knew lnet didn't use tcp!

To be more clear - TCP isn't used on IB, Elan, Myrinet, Cray networks.
On the socklnd (TCP sockets over IP, called tcplnd on some platforms)
it IS used.   I'm just listening to the podcast to see what it is I said...

> On Mon, Aug 3, 2009 at 10:32 PM, Kevin Van Maren<Kevin.Vanmaren at sun.com> wrote:
> > Yes, originally designed so multiple send() calls with small data have a
> > chance to be combined by TCP before being sent over the network -- improve
> > behavior of applications doing small writes.
> >
> > Setting tcp_nodelay disables Nagle, as the additional latency can hurt some
> > interactive session performance.
> >
> > Kevin
> >
> >
> > On Aug 4, 2009, at 10:35 AM, Brock Palen <brockp at umich.edu> wrote:
> >
> >> http://en.wikipedia.org/wiki/Nagle%27s_algorithm
> >>
> >> Looks like you intentionally hold up data to try to make fatter
> >> payloads in packets so they are not 99% header/crc data.  Sounds like
> >> a way to make latency bad.
> >>
> >> Brock Palen
> >> www.umich.edu/~brockp
> >> Center for Advanced Computing
> >> brockp at umich.edu
> >> (734)936-1985
> >>
> >>
> >>
> >> On Aug 3, 2009, at 8:20 PM, Mag Gam wrote:
> >>
> >>> Very nice.
> >>>
> >>> 15:54, what is "Nagle" ?
> >>>
> >>> He didn't say anything about SNS, but changeLogs seems very promising!
> >>>
> >>>
> >>>
> >>> On Mon, Aug 3, 2009 at 8:55 AM, Brock Palen<brockp at umich.edu> wrote:
> >>>>
> >>>> Thanks to Andreas for taking an hour out to talk with Jeff Squyres
> >>>> and
> >>>> myself (Brock Palen) about the Lustre cluster filesystem on our
> >>>> podcast www.rce-cast.com,
> >>>>
> >>>> You can find the whole show at:
> >>>>
> >>>> http://www.rce-cast.com/index.php/Podcast/rce-14-lustre-cluster-filesystem.html
> >>>>
> >>>> Thanks again!
> >>>> If any of you have requests of topics you would like to hear please
> >>>> let me know!
> >>>>
> >>>> Brock Palen
> >>>> www.umich.edu/~brockp
> >>>> Center for Advanced Computing
> >>>> brockp at umich.edu
> >>>> (734)936-1985
> >>>>
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> Lustre-discuss mailing list
> >>>> Lustre-discuss at lists.lustre.org
> >>>> http://lists.lustre.org/mailman/listinfo/lustre-discuss
> >>>>
> >>>
> >>>
> >>
> >> _______________________________________________
> >> Lustre-discuss mailing list
> >> Lustre-discuss at lists.lustre.org
> >> http://lists.lustre.org/mailman/listinfo/lustre-discuss
> >
> _______________________________________________
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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.