[c-nsp] Re: GSR LC memory needs (Was: 7505, OC3s, and BGP)

[Matthew Crocker]

On Jul 21, 2005, at 8:47 AM, Pete Templin wrote:

> How does GSR LC memory consumption compare to VIP memory consumption?
>
> In other words, if we're typically comfortable with 128MB in  
> VIP2-50s, where would we be sitting with 128MB in GSR LCs?  At what  
> point does/did 128MB go boom?
>
> Is the LC memory limit specific by Engine type, or specific to the  
> individual LC flavor


My experience

GSR8,  GRP-B (512MB)  IOS gsr-p-mz.120-30.S3.bin

3 Full BGP views,
10 OSPF neighbors
3 BGP internal peers

164k routes

gsr8-1#show ip cef summary
IP Distributed CEF with switching (Table Version 451143), flags=0x0
   164852 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 33
   670837 instant recursive resolutions, 33 used background process
   1 load sharing elements, 1 references
   24 in-place/0 aborted modifications
   28329632 bytes allocated to the FIB table data structures
   universal per-destination load sharing algorithm, id 552E8D13
   3(0) CEF resets
   Resolution Timer: Exponential (currently 1s, peak 2s)
   Tree summary:
    16-4-4-4-4 stride pattern
    short mask protection disabled
    164852 leaves, 45836 nodes using 8546456 bytes
   Transient memory used: 120, max: 3174328

   Table epoch: 1 (164852 entries at this epoch)

Adjacency Table has 48 adjacencies

gsr8-1#exec slot 0 show proc mem
========= Line Card (Slot 0) =========

Processor Pool Total:  202319200 Used:   63555800 Free:  138763400

gsr8-1#show diag 0

SLOT 0  (RP/LC 0 ): 1 Port Gigabit Ethernet
   MAIN: type 43,  800-3955-03 rev E0
         Deviation:  D994064
         HW config: 0x00    SW key: FF-FF-FF
   PCA:  73-3302-05 rev B0 ver 1
         Design Release 2.1  S/N CAB04107N2R
   MBUS: MBUS Agent (1)  73-2146-07 rev B0 dev 0
         HW version 1.2  S/N CAB04127YXG
         Test hist: 0x07    RMA#: 00-00-00    RMA hist: 0xFF
   DIAG: Test count: 0x00000004    Test results: 0x00000000
   FRU:  Linecard/Module: GE-GBIC-SC-B=
         Processor Memory: MEM-GRP/LC-256=
         Packet Memory: MEM-LC1-PKT-256=
   L3 Engine: 1 - Standard OC48 (2.5 Gbps)
   MBUS Agent Software version 1.100 (RAM) (ROM version is 2.41)
   ROM Monitor version 16.12
   Fabric Downloader version used 25.1 (ROM version is 25.1)
   Primary clock is CSC 1
   Board is analyzed
   Board State is Line Card Enabled (IOS  RUN )
   Insertion time: 00:00:16 (2d10h ago)
   Processor Memory size: 268435456 bytes
   TX Packet Memory size: 134217728 bytes, Packet Memory pagesize:  
8192 bytes
   RX Packet Memory size: 134217728 bytes, Packet Memory pagesize:  
8192 bytes
   0 crashes since restart


So, a 256MB LC has 132MB free RAM.  That would be a very tight fit in  
128MB and a spike in BGP announcements would max out the LC and  
shutdown CEF

-Matt

--
Matthew S. Crocker
Vice President
Crocker Communications, Inc.
Internet Division
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com