Re: [c-nsp] Max performance 6148(A--GE-TX boards
We have been experiencing high input packet drops on interfaces on 6148a's when we are less than ~200mb/s on the 8 ports combined in one case and 100Mb/s in another, not anywhere close to the 8-1 over subscription as advertised. It also got much worse when we went from catos to IOS last week, not sure why. Don't expect too much from a 6148a module. You might want to doublecheck your setup then, as I'm not having this problem. I have these in service on my backup network and they have no problem hitting 1gb full duplex on each group of 8 ports. A quick eyeball of outbound traffic graphs on ports 1-8 of one of the cards gets me 300 + 0 + 0 + 300 + 200 + 150 = 950. Seems about right. ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] Max performance 6148(A--GE-TX boards
Can anyone comment on this ? Does this mean we can get a max of 6 Gig throughput on a 6148A card and max 2 Gbit on a 6148 ? Or do these numbers only apply to etherchannels ? I don't seem to find the right performance figures for these cards. Issue 1: Each group of 8 ports only supports a gigabit. If you get 2 ports in the same range of 8 both trying to download a gigabit, each one is only going to receive 500 mbits. If you have a mix of high bandwidth servers and low bandwidth servers, you should probably spread the high bandwidth servers out so there is only one big bandwidth user per group of 8 ports. Issue 2: When using etherchannel, a copy of EVERY PACKET for the entire etherchannel bundle gets sent to the ASIC. Since the ASIC only has a 1gbit capacity, this means that the entire etherchannel bundle maxes out at 1gb. But wait! It isn't just the etherchannel bundle that maxes out at 1gb. It is the etherchannel bundle plus all other ports on the same ASIC. The result: So, lets imagine you make an etherchannel with port 3/1 and 4/1. Both cards are 6148-GE-TX. Your etherchannel downloads at 1gbit. Now, someone else (not in the Etherchannel) on port 3/2 starts downloading. The downloader AND the etherchannel now have to share the 1gbit restriction, since the ASIC handling 3/1-8 has to receive a copy of every etherchannel packet plus every packet for port 3/2 - all through a 1gbit pipe. The moral of the story is don't etherchannel on WS-6148-GE-TX cards (unless doing so only for redundancy and not for bandwidth). ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] Max performance 6148(A--GE-TX boards
We have been experiencing high input packet drops on interfaces on 6148a's when we are less than ~200mb/s on the 8 ports combined in one case and 100Mb/s in another, not anywhere close to the 8-1 over subscription as advertised. It also got much worse when we went from catos to IOS last week, not sure why. Don't expect too much from a 6148a module. Matt Buford wrote: Can anyone comment on this ? Does this mean we can get a max of 6 Gig throughput on a 6148A card and max 2 Gbit on a 6148 ? Or do these numbers only apply to etherchannels ? I don't seem to find the right performance figures for these cards. Issue 1: Each group of 8 ports only supports a gigabit. If you get 2 ports in the same range of 8 both trying to download a gigabit, each one is only going to receive 500 mbits. If you have a mix of high bandwidth servers and low bandwidth servers, you should probably spread the high bandwidth servers out so there is only one big bandwidth user per group of 8 ports. Issue 2: When using etherchannel, a copy of EVERY PACKET for the entire etherchannel bundle gets sent to the ASIC. Since the ASIC only has a 1gbit capacity, this means that the entire etherchannel bundle maxes out at 1gb. But wait! It isn't just the etherchannel bundle that maxes out at 1gb. It is the etherchannel bundle plus all other ports on the same ASIC. The result: So, lets imagine you make an etherchannel with port 3/1 and 4/1. Both cards are 6148-GE-TX. Your etherchannel downloads at 1gbit. Now, someone else (not in the Etherchannel) on port 3/2 starts downloading. The downloader AND the etherchannel now have to share the 1gbit restriction, since the ASIC handling 3/1-8 has to receive a copy of every etherchannel packet plus every packet for port 3/2 - all through a 1gbit pipe. The moral of the story is don't etherchannel on WS-6148-GE-TX cards (unless doing so only for redundancy and not for bandwidth). ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
[c-nsp] Max performance 6148(A--GE-TX boards
We have a bunch of 65XX with 6148-GE-TX or 6148A-GE-TX boards to connect a large number of servers and different etherchannels between them. When i checked the release notes for 12.2SX, i found the following lines : ... WS-X6148A-GE-TX *Number of ports: 48 Number of port groups: 6 Port ranges per port group: 1-8, 9-16, 17-24, 25-32, 33-40, 41-48 *The aggregate bandwidth of each port group is 1 Gbps. WS-X6148-GE-TX *Number of ports: 48 Number of port groups: 2 Port ranges per port group: 1-24, 25-48 Note WS-X6148-GE-TX, WS-X6148V-GE-TX, and WS-X6148-GE-45AF do not support these features: *More than 1 Gbps of traffic per EtherChannel ... Can anyone comment on this ? Does this mean we can get a max of 6 Gig throughput on a 6148A card and max 2 Gbit on a 6148 ? Or do these numbers only apply to etherchannels ? I don't seem to find the right performance figures for these cards. Thanks for you comments, Wim Holemans ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
