Joerg, The hardware we have in our lab is the 20xSFP + 2x10Gig.. JTAC says this 'should' work but obviously it doesn't.. I tested it on an EX switch and it had no issues.. In a simple L2 mode the MX lost about 47% packets at 64byte 10Gig line rates. In L3 mode is lost about 5.2%.. This is when testing full duplex flows. This was with 9.6R3.8.. There is a known PR related to this issue.
Hope to have some resolution sometime this week.. On Sun, Mar 14, 2010 at 3:14 PM, Joerg Staedele <j...@tnib.de> wrote: > Hi, > > so this means that this Linecard is not able to do line-rate forwarding > with small frame sizes? What about other cards (20xSFP+2x10G) .. I guess > they use exactly the same PFE hardware? So they have this limitation aswell? > > I am really confused now because in every document you read that the DPCE's > are able to do line-rate at any frame-size? > > Regards, > Joerg > > -----Original Message----- > From: juniper-nsp-boun...@puck.nether.net [mailto: > juniper-nsp-boun...@puck.nether.net] On Behalf Of Jonathan Lassoff > Sent: Sunday, March 14, 2010 6:55 PM > To: Serge Vautour > Cc: juniper-nsp > Subject: Re: [j-nsp] RFC2544 on Juniper MX960 10G ports > > Excerpts from Serge Vautour's message of Thu Feb 18 16:28:44 -0800 2010: > > Hello, > > > > We recently used a traffic generator to run RFC2544 tests against a > Juniper MX960. The 1G ports work flawlessly. 0% packet loss at all frame > sizes. > > > > The 10G ports (4x10G "R" card) didn't do as well. They dropped up to 25% > packets with certain small frames (ex: 70 byte frames). The packet loss goes > away almost completely for frames larger than 100 bytes. Our SE tells us > this is normal and is due to how the MX chops the frames up into 64 byte > cells inside the PFE. The 4x10G cards have 4 separate PFEs (1 per 10G port) > and each of them has 10G of bandwidth. 10G of small frames essentially > creates more than 10G of traffic inside the PFE. That explanation may not be > 100% correct but I think it paints the right picture. > > > > Now the questions. Is this a problem on production networks with real > world traffic? What about on VPN networks with alot of small frames like > VoIP? Has anyone seen this problem creep it's head in production? > > Isn't the minimum Ethernet frame size 64 bytes? I think Ethernet II / > Ethernet 802.3 requires this. > > Wouldn't this make the problem moot if you're just running Ethernet? > > Might be a problem with small ATM cells? > > Cheers, > jof > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp