[c-nsp] Malloc fail on 7206VXR

[Rodney Dunn]

It sounds like a lot of small blocks were used and
freed back.  But what is strange there is the Lowest
column should be lower if the memory was actually
used.  So in your case it's as if a few small blocks
were used over and over to cause the fragmentation.

It would be interesting to see:
sh ver
sh mem free

Unfortunately though unless you are on 12.2(20.04)S or
later if the blocks are listed as "fragments" we have
no way to tell who the original memory requestor was that
caused a fragment to exist.  I had DE add an update
so we could have some history of the block and that
code went in 12.2(20.4)S.

I want to say it was most likely BGP transient memory usage
but if that were the case I would have expected the
"lowest" mark to have been lower but that wasn't the case.

I took a quick glance at all the bugs that went in
between 18S3 and 18S5 and the only one that jumped out
at me was a cef/dCEF toggling issue that resulted in
a memory leak.  That wouldn't apply here.

Did you reboot the box to clean it up?

Rodney


On Mon, Oct 11, 2004 at 02:12:46PM +0300, Oleksandr Pantus wrote:
> Hello !
> 
> Have a trouble with 7206VXR NPE-300. There was a flap of BGP session
> with our main upstream, and router got fullview BGP table from another border
> router (back-up link) by iBGP. Main upstream came up, and router relearned
> fullview from it. After such a maneuvres, I start to get following
> error messages almost every minute:
> 
> Oct 11 13:54:25.731: %SYS-2-MALLOCFAIL: Memory allocation of 262152 bytes failed from 0x60737F04, alignment 32 
> Pool: Processor  Free: 45345896  Cause: Memory fragmentation 
> Alternate Pool: None  Free: 0  Cause: No Alternate pool 
> 
> -Process= "Per-Second Jobs", ipl= 3, pid= 28
> -Traceback= 60733674 60737294 60737F0C 605247E8 60524A6C 605286F0 607445D4 606BE028
> 
> Here is "shov version" output.
> 
> Cisco Internetwork Operating System Software 
> IOS (tm) 7200 Software (C7200-P-M), Version 12.2(18)S5,  RELEASE SOFTWARE (fc1)
> 
> cisco 7206VXR (NPE300) processor (revision B) with 229376K/65536K bytes 
> of memory.
> Processor board ID 13253888
> R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache
> 6 slot VXR midplane, Version 2.0
> 
> And "show memory free"/
> 
>                Head    Total(b)     Used(b)    Free(b)   Lowest(b)  Largest(b)
> Processor  6240DCA0   197075808   151750648   45325160   45177992     131144
>       I/O  20000000    33554432      906592   32647840   32646288   30496312
>     I/O-2   E000000    33554456     4895528   28658928   28658928   28658744
> 
> 
> It seems that 12.2(18)S5 have a memory leak due to fragmentation.
> There was no such a problem with 12.2(18)S3. 
> 
> Or there is some other explanation to the small size of max
> allocated block while there is about 45M of free processor memory ?
> 
> -- 
> S/Y,
> Alexander, MD, 			nic-hdl: AJP1-UANIC
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