Messages in this thread |  | | Date | Mon, 8 Jan 2001 09:06:45 -0500 | From | Tim Sailer <> | Subject | Re: Network Performance? |
| |
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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |