From: Chris Home (clarson52@comcast.net)
Date: Fri Jan 17 2003 - 00:25:10 GMT-3
P.S. i am not suggesting it is a fix for your problem. Just an example of
how all manner of things that could be happening. As others have mentioned
there is also fragmentation, pc performance and poor application programing
etc. etc.
----- Original Message -----
From: "Chris Home" <clarson52@comcast.net>
To: "Pc9101" <kieu@hn.vnn.vn>; "Ccielab@Groupstudy.Com"
<ccielab@groupstudy.com>
Sent: Thursday, January 16, 2003 10:22 PM
Subject: Re: How fast can Ftp speed reach?
> You also have to take TCP window sizing, acknowledgements and other such
TCP
> stack info into account when doing tests using file transfer.
>
> There are many factors that could be a contributor to this issue.
>
> On high speed low latency links like an OC-3 or better it is recommended
> that you change the TCP send and recieve window size to it's max. I had a
> customer that was not getting near the throughput they should be over an
> OC-3 doing data replication. We changed the tcp send and recieve window
size
> and wa-la. Fixed.
>
> I know tcp uses a sliding window, but it is based on the bounds placed on
> it by windows if your using windows. A lot of those programs claiming they
> can give you better performance on your Internet connection (you know
those
> damn pop-up/pop-under ads) are based on adjusting parameters in the TCP
> stack.
>
>
>
> ----- Original Message -----
> From: "Pc9101" <kieu@hn.vnn.vn>
> To: "Ccielab@Groupstudy.Com" <ccielab@groupstudy.com>
> Sent: Thursday, January 16, 2003 8:56 PM
> Subject: Re: How fast can Ftp speed reach?
>
>
> > Hi Fan !
> >
> > FTP may useful to test a low-speed wan interface, but high speed Campus
> ...
> > In the latter case, your PC not strong enough to receive 12,5Kbytes/sec
> > (100/8) The main reason is Harddisk writting speed.
> >
> > In the first case, the result may lower a bit in compare to Bandwidth/8,
> > because of some kinds of header. FTP only count speed base on (amount of
> > data)/sec
> >
> > There are some software that use to calculate the utilization of
bandwidth
> > like MTRG, or solarwind ...
> >
> > Cheers
> > PC9101
> >
> >
> > ----- Original Message -----
> > From: "Fan Shan" <fansh@publicf.bta.net.cn>
> > To: "Ccielab@Groupstudy.Com" <ccielab@groupstudy.com>
> > Sent: Friday, January 17, 2003 7:33 AM
> > Subject: How fast can Ftp speed reach?
> >
> >
> > > May I ask a question not very relational to CCIE.
> > > I am working for a IDC, one our customer complained their application
is
> > slow. They ask to test the ftp speed between our two switch port.
> > > BTW, our structure is connecting customers to 6509 FE port,and 100M
> > bandwidth supplied.We put 2 PC to 2 port, assign different vlan for
these
> 2
> > port,
> > > one to be ftp client,another to be ftp server, the test result is
> > 300-400Kbytes/s. We can see the mls entry established by the two ip
> > address.The customer
> > > says the speed is too slow comparing to the port speed(100M).But we
> > think this may be resulted in the tesing PCs or some features of FTP
> > protocol.
> > > But I cannot explain why the speed maybe slow between two switch
> ports,but
> > very fast to other sites on the internet. Can someone help me to explain
> > that?
> > > We are using 6509 MSFC feature,different vlans are assigned to
> different
> > physical ports,and the routing protocol is OSPF.
> > > .
> > .
.
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