Messages in this thread |  | | Date | Sat, 06 Jan 2001 22:11:40 +1100 | From | Andrew Morton <> | Subject | Re: Network Performance? |
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Tim Sailer wrote: > > On Thu, Jan 04, 2001 at 01:33:40AM -0500, Tim Sailer wrote: > > This may not be the right forum to ask this. If not, please let me know > > where to ask. > > > > I have a Debian box with 2 NICs. Both 100/full duplex. This machine is > > running as a ftp proxy (T.Rex suite). As part of the traffic going through the > > box, some streams have 1000k window size for a certain reason. How do > > I tune the NICs to handle the streams better? There are ways of doing this > > on other OSs. Right now, the box only does about 1.8Mb when it should be doing > > 80+Mb. > > > > Thanks, > > Tim > > > > PS: This is really something to do with the window size and WAN latency. > > The ultimate source and destination points are either Solaris or AIX > > boxes. The files being sent are > 1GB in size. > > The box does well when traffic goes in one NIC and out the other, as long > > as the end point is local When it hits the WAN, it all dies. Traffic not > > going through the box just flies right along, as long as both the end points > > have the large tcp window size. Putting the Linux box in the middle is a > > severe choke point. :( > > I have followed the suggestions in http://www.psc.edu/networking/perf_tune.html > but I still can not get any kind of real throughput. 250kB is all I can > get from the Linux box. Setting [r|w]mem_[default|max] larger than 16k > makes no difference, smaller slows things down even more. Has anyone else > ran across this and fixed it? I can't be the only one with a Linux box > on a fat pipe looking for maximum throughput...
Tim,
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.
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