Keith Tokash has a pretty good writeup on the 6704 vs 6708 buffer issue: http://www.cciecandidate.com/?p=505
-Steve -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jason Lixfeld Sent: Tuesday, March 31, 2009 1:38 PM To: Richard A Steenbergen Cc: Gert Doering; [email protected] Subject: Re: [c-nsp] 10GE card for 7609 Looks like the 6708 isn't as bad as we think. On 2009-03-31, at 4:12 PM, Richard A Steenbergen <[email protected]> wrote: > On Tue, Mar 31, 2009 at 10:01:24AM +0200, Gergely Antal wrote: >> I meant that you can not push 40G out of a 6704 >> even with a dfc attached to it.But you can do it with a 6708 >> with 1:1 subscription. > > Worse, some days you can't even get 7G in from a single port on a 6704 > with the other 3 ports unused. We routinely have problems with ingress > interface overruns or egress interface output queue overflows on 6704 > in that traffic range, and DFC doesn't make any difference. > > It seems like it is head of line blocking, and TAC's only answer is > "those things have no buffers, buy a 6708". The problem can usually be > worked around by changing the way traffic is being mapped between the > ports. For example, the one that seems to be the absolute worst case > is > "in one port and out the other on the same fabric channel", i.e. in > port > 1 and out port 2 or the same thing on 3/4. > > -- > Richard A Steenbergen <[email protected]> http://www.e-gerbil.net/ras > GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 > 2CBC) > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
