[TIGGE #YSF-211129]: TCP tuning for TIGGE tuning

Hi YangXin
 
Apologies for the delayed reply, I've been out and missed your response.

> The OS for my system is AIX 5L 5.1 with maintenance level 02 (5100-02), it is 
> a node in a RS/6000 SP 
> with 2 POWER3 Processors and 1GB of memory. We are planning to implement a 
> new platform to substitute
> for the old SP. The new system will be using Linux as the OS, SUSE or Redhat 
> is the most probable choice.

I don't remember doing much TCP tuning on AIX, but let me check and get back to 
you.  We do have
two AIX systems in-house, so it would have been a while back.  Either way, 1GB 
of memory is not much
if the machine is to receive data and do much of anything else.

> I intuitively think that Linux is better than AIX to do the business relating 
> to network, such as data 
> transfter across networks and servers. However, probably it is only because 
> the default settings for
> Linux is good for network.

I agree.  You'll have much better luck with Linux.  More memory would also be 
good.

> So what settings do you think I can change to improve the network or TCP 
> performance for the current 
> system. Is there any difference when tunning the TCP performance between AIX 
> and Linux for LDM?

There are subtle differences in tuning AIX and Linux (mostly parameter names), 
but in general, 
the network stacks on most Unix systems have evolved from the same basic model

Best Regards,

mike

> Thank you.
> 
> YangXin,
> Dec 15.
> 
> 
> 
> ======= 2006-12-15 07:45:24 �������������=======
> 
> >Doug,
> >
> >Mark Uris and I (Mike Schmidt) worked together on setting appropriate
> >values for dataproc.  I would need to know a little more about the
> >operating system and revision on the system to be tuned?  Generally
> >speaking. most OS vendors ship with the default TCP window sizes in
> >the 48-64KB range.  For long distance, higher latency, and large
> >bandwidth connections, a better number is usually 256KB and up.
> >We've used 1MB window sizes safely on quite a few different operating
> >systems, however one has to look at the available free memory on a
> >given system to avoid over committing the memory resources.
> >
> > <http://www.psc.edu/networking/projects/tcptune>
> >
> >Is a good starting point.
> >
> >mike
> >
> >> Hi Tom,
> >>
> >> Did you help us out with TCP window tuning last year?  YangXin at CMA
> >> needs some assistance in figuring out the process, and don't recall
> >> exactly
> >> what it involved.
> >>
> >> Thanks -Doug
> >>
> >> Begin forwarded message:
> >>
> >> > From: <address@hidden>
> >> > Date: December 12, 2006 7:52:54 AM MST
> >> > To: "Doug Schuster" <address@hidden>, "Baudouin Raoult"
> >> > <address@hidden>
> >> > Cc: "=CC=EF=BA=C6" <address@hidden>, "David Ian Brown" <address@hidden>,
> >> > "Manuel Fuentes" <address@hidden>
> >> > Subject: The LDM sending of data and Questions
> >> >
> >> > Regarding the TCP Tuning, I might have some misunderstanding on
> >> > LDM, I had thought LDM only use PRC to communicate with each other,
> >>
> >> > thus ignored the TCP's issue on LDM data exchange. I'd like to do
> >> > the TCP Tuning on my machine, would you like give us some hints to
> >> > do that? Where should I start?
> >> >
> >> > Best Regards,
> >> >
> >> > YangXin,
> >> > Dec 12
> >> Cheers,
> >>
> >> Tom
> >> ****************************************************************************
> >> Unidata User Support                                    UCAR Unidata 
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> >> 3000
> >> address@hidden                                   Boulder, CO 80307
> >> ----------------------------------------------------------------------------
> >> Unidata HomePage                       http://www.unidata.ucar.edu
> >> ****************************************************************************
> >>
> >
> >
> >Ticket Details
> >===================
> >Ticket ID: YSF-211129
> >Department: Support IDD TIGGE
> >Priority: Normal
> >Status: Closed
> >
> 
> = = = = = = = = = = = = = = = = = = = =
> 
> 
> ������������������
> ����
> 
> 
> ����������������yangxin
> ����������������address@hidden
> ��������������������2006-12-15
> 
> 


Ticket Details
===================
Ticket ID: YSF-211129
Department: Support IDD TIGGE
Priority: High
Status: Closed