06-07-2012 07:33 AM - edited 03-07-2019 07:07 AM
Hi all,
I've read through some of the discussions here regarding the 3560x ASICs, but still not clear on the architecture.
I see 3 port-asics on the 3560x. What is the job of these ASICs?
Also, what is the total throughput of the 3560x series?
I'm researching interface output drops that correlate with drops that I see on the corresponding asic.
I also have a lot of buffer misses in the public and interface buffer pools.
#sh platform port-asic stats drop asic 1
Port-asic Port Drop Statistics - Summary
========================================
RxQueue Drop Statistics Slice0
RxQueue 0 Drop Stats Slice0: 0
RxQueue 1 Drop Stats Slice0: 0
RxQueue 2 Drop Stats Slice0: 0
RxQueue 3 Drop Stats Slice0: 0
RxQueue Drop Statistics Slice1
RxQueue 0 Drop Stats Slice1: 0
RxQueue 1 Drop Stats Slice1: 0
RxQueue 2 Drop Stats Slice1: 0
RxQueue 3 Drop Stats Slice1: 0
Port 0 TxQueue Drop Stats: 3712363
Port 1 TxQueue Drop Stats: 0
Port 2 TxQueue Drop Stats: 97030
Port 3 TxQueue Drop Stats: 1450621
Port 4 TxQueue Drop Stats: 3834
Port 5 TxQueue Drop Stats: 210196
Port 6 TxQueue Drop Stats: 0
Port 7 TxQueue Drop Stats: 0
Port 8 TxQueue Drop Stats: 1
Port 9 TxQueue Drop Stats: 0
Port 10 TxQueue Drop Stats: 5294
Port 11 TxQueue Drop Stats: 875
Port 12 TxQueue Drop Stats: 0
Port 13 TxQueue Drop Stats: 4191
Port 14 TxQueue Drop Stats: 0
Port 15 TxQueue Drop Stats: 1025
Thanks in advance!
06-07-2012 09:54 AM
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Posting
Regarding 3560-X performance, I believe all are line-rate/wire-speed capable.
Do note though, that does not preclude drops on congested interfaces which is probably your issue.
06-08-2012 06:04 AM
Is interface congestion due to limitations by the ASIC or caused by what's connected on the other end? Given the 3560x is wire-speed, is it still possible to over subscribe the ASICs? Based on some reading outside of this forum, I understand that there are very small interface buffers on the 3560x - perhaps that is the cause.
Could anyone clarify for me?
06-08-2012 07:04 AM
The ASIC on the 3560X are line rate. Since you have output drops, at some point in time, you are sending more then 1 Gbps to a port. The buffer can take a little burst but will start drop at some point. You might be able to optimise your queues and thresholds.
If you look at it by interface, you will see where you are dropping frame.
06-08-2012 09:29 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
As Dominic's post notes, you can drop frames when you send faster to an egress interface than it can physically transmit. If the hardware wasn't line-rate, you might see lost frames before the egress interface hits full capacity, but again, think its the former not the latter.
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