[nsp] cannot burst the line
Felix Lee
felixlee_hk@hotmail.com
Sun, 22 Sep 2002 03:01:01 +0000
Dear all,
The case has temporary been solved.
Along the file transfer path, there are two sites connected with two frame
relay circuits for load-balancing. We have found the bottle-neck is on
these two circuit. Finally, the traffic can be burst after putting back the
route-cache, but they are no longer in load-balancing.
Please advise if there is any better solution?
Thanks
FL
>From: "D" <dlewis500@sanbrunocable.com>
>To: "Felix Lee" <felixlee_hk@hotmail.com>, "dave o'leary"
><doleary@juniper.net>
>CC: <cisco-nsp@puck.nether.net>
>Subject: Re: [nsp] cannot burst the line
>Date: Fri, 13 Sep 2002 10:40:45 -0700
>
>Used to run into similar issues like this back in the day. Quite
>frequently.
>
>A very simple way to test some of these issues is to run 2-3 concurent file
>transfers.
>
>If one transfer does 220Kb/s, do two transfers fill the pipe to 400+Kb/s?
>If it does, then you know its not the network in the middle thats limiting
>you.
>
>-D
>
>Darrel Lewis
>
>----- Original Message -----
>From: "dave o'leary" <doleary@juniper.net>
>To: "Felix Lee" <felixlee_hk@hotmail.com>
>Cc: <cisco-nsp@puck.nether.net>
>Sent: Friday, September 13, 2002 6:16 AM
>Subject: Re: [nsp] cannot burst the line
>
>
> > At 12:48 AM 9/13/2002 +0000, Felix Lee wrote:
> > >Dear all,
> > >
> > >It is a leased circuit. It can be bursted up to 500K at day time. But
> > >the file copying cannot only occupy half of the bandwidth.
> >
> > Without more details, it is difficult to determine what the issue might
> > be - similar to the question/discussion posted by Blaz Zupan recently.
> >
> > - is there another link/circuit somewhere else in the end to end path
> > that is a bottleneck that would cause either TCP or the
>application
> > to throttle back the transfer to 220kb/s?
> >
> > - was the TCP window of your system holding the transfer rate to a
>lower
> > value because of a long delay? See here for some hints for
> > understanding these issues (although 220 kb/s is really quite
>low,
> > there are also some pretty poor TCP implementations still
>lingering
> > around out there)
> > http://www.psc.edu/networking/perf_tune.html
> >
> > - looking at the switching devices in the path (routers, FR switches,
>ATM
> > switches, ethernet switches) - is there some device somewhere
>that
> > is tossing packets? Is it configured to do so or is it seeing
>some
> > errors in the packets and hence throwing them away?
> >
> > I hope this provides some hints but again it is difficult to diagnose
>further
> > without more information about the network topology and environment.
> >
> > dave
> >
> >
> > >FL
> > >
> > >
> > >>From: Jared Mauch <jared@puck.nether.net>
> > >>To: Felix Lee <felixlee_hk@hotmail.com>
> > >>CC: cisco-nsp@puck.nether.net
> > >>Subject: Re: [nsp] cannot burst the line
> > >>Date: Thu, 12 Sep 2002 10:52:16 -0400
> > >>
> > >> is this frame relay?
> > >>
> > >> if so, most telcos, etc.. have a 50% CIR (Commited
>Information
>Rate)
> > >>that allows you to burst up to 512k at times when there is capacity
>but
> > >>they only commit to giving you 50% of the full link speed.
> > >>
> > >> - jared
> > >>
> > >>On Thu, Sep 12, 2002 at 02:47:12PM +0000, Felix Lee wrote:
> > >> >
> > >> > Dear all,
> > >> >
> > >> > I have a 512K link, the link can be bursted to ceiling in day time.
>I
> > >> have
> > >> > scheduled a job to copy around 3GB data from one end to another
>atthe
> > >> night
> > >> > time, and which was expected to be completed at around 13 to 14
>hours, but
> > >> > we have only got half of the volume transferred. Monitoring by
>MRTG,
>we
> > >> > found the utilization of the link is flat at around 220kbps during
>file
> > >> > copying. Can someone tell me why I cannot fully utilize the
>bandwidth?
> > >> > How can I make it?
> > >> >
> > >> > Thanks in advance.
> > >> >
> > >> > FL
> > >> >
> > >> >
> > >> > _________________________________________________________________
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> > >> > _______________________________________________
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> > >>
> > >>--
> > >>Jared Mauch | pgp key available via finger from jared@puck.nether.net
> > >>clue++; | http://puck.nether.net/~jared/ My statements are only
>mine.
> > >
> > >
> > >
> > >
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