[j-nsp] M10 FEB heap usage (RPF/route options)

[Nicolaj Kamensek]

Kevin Day schrieb:

Hi Kevin,

>    Heap utilization                   97 percent

what does

show arp no-resolve | count

say?

> It made sense that whatever "route options" are was the difference. I  
> found an old post here discussing SSB SDRAM usage (http://puck.nether.net/pipermail/juniper-nsp/2005-May/004275.html 
> ) that mentioned that RPF can require route options. I disabled rpf on  
> every interface, but that did no good. I restarted the router though,  
> and sure enough the allocations for route options were gone. Heap  
> usage is back down to 75%.

Unfortunately, restarting the FEB is the only thing that helps freeing 
memory if you came close to 100%.

> Is this normal? I seem to remember being able to fit 500k+ routes not  
> that long ago (multiple ribs). Did the size of each v4 route entry  
> grow during a junos upgrade at some point?

500k+ routes is still possible. Those routes are stored in the 8MB SSRAM 
on your FEB but also a copy of this table is stored in the DRAM, 64MB in 
your case. You reached the limits of your DRAM, not the SSRAM. Upgrading 
it should help, either by buying a newer router like M7i/M10i(with 256MB 
DRAM on the FEB) or by installing a enhanced FEB for M10 routers.

> Does this mean those of us stuck on 64MB FEB/SSB systems are going to  
> have to run without RPF now or in the very near future when the size  
> of a full table grows a bit more?

Pretty much, yes. 64MB isn't simply large enough for todays full-table + 
arp entries + RPF + ... 128MB or more might be sufficient for that.

We reached our limits on a M20 router with SSB-E with about 7500 arp 
entries, full-table and no RPF. Upgrading to SSB-E16 solved that problem.


Best regards,
Nicolaj Kamensek


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