From: Tim Sailer <sailer@bnl.gov>
To: Andrew Morton <andrewm@uow.edu.au>
Cc: linux-kernel@vger.kernel.org, jfung@bnl.gov
Subject: Re: Network Performance?
Date: Mon, 8 Jan 2001 09:06:45 -0500 [thread overview]
Message-ID: <20010108090644.A12440@bnl.gov> (raw)
In-Reply-To: <20010104013340.A20552@bnl.gov>, <20010104013340.A20552@bnl.gov>; <20010105140021.A2016@bnl.gov> <3A56FD6C.93D09ABB@uow.edu.au>, <3A56FD6C.93D09ABB@uow.edu.au>; <20010107235123.B6028@bnl.gov> <3A5995CF.7AEFFBBD@uow.edu.au>
In-Reply-To: <3A5995CF.7AEFFBBD@uow.edu.au>; from andrewm@uow.edu.au on Mon, Jan 08, 2001 at 09:26:23PM +1100
On Mon, Jan 08, 2001 at 09:26:23PM +1100, Andrew Morton wrote:
> Tim Sailer wrote:
> >
> > On Sat, Jan 06, 2001 at 10:11:40PM +1100, Andrew Morton wrote:
> > > this issue was discussed on the netdev mailing list a few weeks
> > > back.
> > >
> > > It's very unfortunate that the web archives of netdev
> > > stopped working several months ago and there now appears
> > > to be no web archive of netdev@oss.sgi.com.
> > >
> > > Go to http://oss.sgi.com/projects/netdev/archive/ and
> > > pull down the November and December archives.
> > >
> > > The subject was "linux to solaris tcp issues on WAN".
> > >
> > > The conclusion was "The problem is also fixed with
> > > 2.4.0-test12pre3". Dunno about kernel 2.2 though.
> >
> > Well, on Friday, we pulled down the 'official' 2.4.0, and had the
> > same experience... nothing better. Should I get the -test12-pre3 kernel
> > and try that one specifically?
>
> I doubt if that would help.
>
> I claim no expertise in this area, but perhaps we can
> get some protocol gurus interested.
>
> To recap:
>
> You're sending and receiving FTP/TCP/IP4 to Solaris and AIX hosts
Yup
> You have a 1000kbyte window size
Yup
> You have an 80 megabit/sec pipe.
Actually, 100 to the router, and then the WAN connection to the remote
system is OC-3
> You're getting 1.8 megabits/sec.
Yup
> What is the round-trip time on the WAN?
>
> Packet loss?
101 packets transmitted, 101 packets received, 0% packet loss
round-trip min/avg/max = 109.6/110.3/112.2 ms
> Does the problem occur in both directions?
Good question. I'll find out.
> Are you _sure_ the window size is being set correctly? How
> is it being set?
I'm fairly sure. We echo the value to the file. catting it back
shows the correct value. If we go lower than default, it slows
down even more.
> Are you able to generate TCP dumps when the problem is happening?
We can, if it will help.
Tim
--
Tim Sailer <sailer@bnl.gov> Cyber Security Operations
Brookhaven National Laboratory (631) 344-3001
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next prev parent reply other threads:[~2001-01-08 14:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-04 6:33 Network Performance? Tim Sailer
2001-01-05 19:00 ` Tim Sailer
2001-01-06 11:11 ` Andrew Morton
2001-01-06 15:48 ` Alan Cox
2001-01-08 4:51 ` Tim Sailer
2001-01-08 10:26 ` Andrew Morton
2001-01-08 14:06 ` Tim Sailer [this message]
2001-01-08 18:07 ` Erik Mouw
2001-01-09 13:55 ` Tim Sailer
2001-01-09 16:52 ` Martin Josefsson
2001-01-09 18:35 ` Tim Sailer
2001-01-08 18:40 ` Craig I. Hagan
2001-01-09 15:29 ` Tim Sailer
2001-01-08 19:58 ` John Heffner
2001-01-09 16:53 ` Tim Sailer
2001-01-09 19:29 ` John Heffner
2001-01-09 20:56 ` Tim Sailer
2001-01-11 10:00 ` Pekka Pietikainen
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