nanog mailing list archives
RE: Jumbo frame Question
From: "Richard Graves (RHT)" <rgraves () ColumbusAirports com>
Date: Fri, 26 Nov 2010 17:23:06 +0000
Jon, Do you have something blocking MTU Path Discovery? Unless I'm off base on this, shouldn't that be taking care of your issue? -Richard -----Original Message----- From: Jon Meek [mailto:meekjt () gmail com] Sent: Friday, November 26, 2010 12:17 PM To: nanog () nanog org Subject: Re: Jumbo frame Question I have the "opposite problem". I use iperf to test WAN and VPN throughput and packet loss, but find that the sending Linux system starts out with the expected MTU / MSS but then ramps up the packet size to way beyond 1500. The result is that network equipment must fragment the packets. On higher bandwidth circuits there are a lot of re-transmits that mask any real packet loss that might exist in the path. I have tried multiple methods to clamp the MTU, but nothing has worked so far. This leads me to wonder how often real bulk transfer applications start using jumbo packets that just end up getting fragmented downstream. The jumbo packets from iperf occur on various versions of the Linux kernel and different distributions. It might only happen on GigE. Suggestions on clamping the MTU are welcome. Thanks, Jon On Thu, Nov 25, 2010 at 7:13 PM, Harris Hui <harris.hui () hk1 ibm com> wrote:
Hi Does anyone have experience on design / implementing the Jumbo frame enabled network?
Current thread:
- Jumbo frame Question Harris Hui (Nov 26)
- Re: Jumbo frame Question Hank Nussbacher (Nov 26)
- Re: Jumbo frame Question Jon Meek (Nov 26)
- RE: Jumbo frame Question Richard Graves (RHT) (Nov 26)
- RE: Jumbo frame Question George Bonser (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- Re: Jumbo frame Question Valdis . Kletnieks (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- Re: Jumbo frame Question Saku Ytti (Nov 26)
- RE: Jumbo frame Question Brandon Kim (Nov 26)
- RE: Jumbo frame Question Mikael Abrahamsson (Nov 26)
- Re: Jumbo frame Question Randy Bush (Nov 26)
- RE: Jumbo frame Question George Bonser (Nov 26)
- Re: Jumbo frame Question Mikael Abrahamsson (Nov 26)
- Re: Jumbo frame Question John Kristoff (Nov 29)