[j-nsp] Antwort: Re: Antwort: Re: Antwort: Re: Bad TCP Session Performance

[jens.hoffmann at ddkom.de]

I'm using various applications for the test :

- end to end ftp-transfer
- ftp-transfer between two Juniper Nodes via STM-1 or aggregated SONET

The following transfer shows the bandwidth limitation :

ftp> get /var/tmp/jinstall-7.2R1.7-domestic-signed.tgz
local: /var/tmp/jinstall-7.2R1.7-domestic-signed.tgz remote:
/var/tmp/jinstall-7.2R1.7-domestic-signed.tgz
200 PORT command successful.
150 Opening BINARY mode data connection for '/var/tmp/jinstall-7.2
R1.7-domestic-signed.tgz' (66618900 bytes).
100%
|******************************************************************************************|
 65057 KB    00:00 ETA
226 Transfer complete.
66618900 bytes received in 29.96 seconds (2.12 MB/s)



The RTT between these nodes is about 3ms.
The STM-1-Link has a load of about 28-30 %.

Jens

Hannes Gredler <hannes at juniper.net> schrieb am 03.04.2006 10:08:01:

> what kind of test-application do you use ?
>
>
> jens.hoffmann at ddkom.de wrote:
> >
> > The test runs as follows :
> >
> > Host-1 === fe === M7i ===aggregated SONET 2xSTM-1 === M5 === fe(802.1Q)
===
> > CATALYST3550 === Host-2
> >
> > or
> >
> > Host-1 === fe === M7i ===aggregated SONET  2xSTM-1 === M5 === fe ===
Host-2
> >
> > or
> >
> > Host-1 === fe === M10i ===SONET 1xSTM-1=== M5 === fe === Host-2
> >
> > Kind Regards
> > Jens
> >
> > Hannes Gredler <hannes at juniper.net> schrieb am 03.04.2006 09:51:35:
> >
> >
> >>ok 7.0R2.7 is not affected by the TCP problem
> >>that was mentioned by luiz;
> >>
> >>did you do perform your throughput test from the RE to some host on the
> >
> > net ?
> >
> >>/hannes
> >>
> >>jens.hoffmann at ddkom.de wrote:
> >>
> >>>Hi Hannes,
> >>>
> >>>I'm using the same JUNOS 7.0R2.7 on each device (M7i, M10i, M5 and
> >
> > M10).
> >
> >>>The end to end RTT is not conspicuous.
> >>>
> >>>Model: m7i
> >>>JUNOS Base OS boot [7.0R2.7]
> >>>JUNOS Base OS Software Suite [7.0R2.7]
> >>>JUNOS Kernel Software Suite [7.0R2.7]
> >>>JUNOS Packet Forwarding Engine Support (M7i/M10i) [7.0R2.7]
> >>>JUNOS Routing Software Suite [7.0R2.7]
> >>>JUNOS Online Documentation [7.0R2.7]
> >>>JUNOS Crypto Software Suite [7.0R2.7]
> >>>
> >>>Kind Regards
> >>>Jens
> >>>
> >>>
> >>>Hannes Gredler <hannes at juniper.net> schrieb am 03.04.2006 09:20:27:
> >>>
> >>>
> >>>
> >>>>jens,
> >>>>
> >>>>what JUNOS S/W do you run ?
> >>>>
> >>>>/hannes
> >>>>
> >>>>jens.hoffmann at ddkom.de wrote:
> >>>>
> >>>>
> >>>>>
> >>>>>Hi,
> >>>>>
> >>>>>I have a litlle bit tricky problem.
> >>>>>
> >>>>>Without packet loss, large latency and lack of WAN bandwidth  I'm
> >>>
> >>>recognize
> >>>
> >>>
> >>>>>a limited TCP session bandwidth at about 16-20 Mbps for every single
> >>>
> >>>TCP
> >>>
> >>>
> >>>>>session.
> >>>>>
> >>>>>At first I had the suspect that the problem is caused by enabled
flow
> >>>>>control on some ethernet interfaces. But the problem appears also
with
> >>>>>disabled flow control.
> >>>>>Policers are also not configured on the path of the session.
> >>>>>
> >>>>>I'ld be very pleased for some helpful advice.
> >>>>>
> >>>>>Kind Regards,
> >>>>>Jens