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On Sat, Feb 16, 2013 at 5:14 PM, CiscoNSP_list CiscoNSP_list < [email protected]> wrote: > > > Hi Rob (Sorry for not replying inline, but hotmail screws the formatting) > > We did try tuning qos buffers (It did improve the drops, but they were > still significant), and we also tried disabling mls qos (Still saw > significant drops)....Im really interested to know why there is such a > difference between the two platforms....i.e. is it buffers/how they are > allocated, architectural differences or combination of both? > > Cheers. > > > > > Date: Sun, 17 Feb 2013 00:27:31 +0100 > > Subject: Re: [c-nsp] 2960 -> 4948 - no more drops :) > > From: [email protected] > > To: [email protected] > > CC: [email protected] > > > > > We recently upgraded a 2960G(Only doing L2) that was hitting > ~500Mb/sec on one port, and we were seeing 40,000+ output drops (5Min) - > Since the swap to the 4948, we see zero output drops. Is the difference in > performance purely buffer size? I *think* the 2960 has 1.9Mb (Per ASIC) > and the 4948 has 16Mb (total?)? > > > > It can also be default srr-queue configuration if mls qos was enabled. > > > > Try connect host again to 2960G but configure 'srr-queue bandwidth > > shape 0 0 0 0' on all ports before. > > > > You can also : > > - assign all traffic to one particular queue which increase amount of > > buffers (eg. all dscp's to queue2) > > - reconfigure (increase) thresholds for queue2 > > > > 1900000/24 ports = (79166 / 4 queues) * 8bits = 160Kbit per queue > > > > No so much. IMHO Cat4948 has more dynamic buffering instead of static > > allocation per port / per queue. > > > > Rob > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > -- Alex Presse "How much net work could a network work if a network could net work?" _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
