CNFS mmap allocation problem and kernel panic

[Alex Kiernan]

Antoine Delvaux <antoine.delvaux at belnet.be> writes:

> Hello all,
> 
> I'm coming back with a problem we've seen a few times before (see thread 
> 'CNFS mmap memory error' in march) and are starting to see it quite 
> frequently now.  We use INN-STABLE-20021007 in a feeder only setup (no 
> readers, no overview).  We use CNFS buffers as storage method.  The OS is 
> Debian stable with a 2.4.18 kernel build from Debian sources.  The box 
> itself is a Dell 6400 with 2GB ram and 4 Pentium III Xeon 700MHz.  It is 
> fully dedicated to INN with an apache server to access the stats.
> 
> This machine has been working great during two months but wasn't very 
> loaded, only 10-20 peers exchanging full feed, workload between 1 and 2 (4 
> processors box), output traffic around 120Mb/s.  However we were sometimes 
> seeing the following lines in the logs (extract of innreport), at random 
> occurences :
> 
> ----
> Unknown entries from news log file:
> 
> First 50 / 2870 lines (1.7%)
> Sep 24 19:38:52 aotearoa innfeed[24368]: CNFS-sm: could not mmap token 
> @0301423130000000000000274D45000002CB@ B10:0x4e9a8a0c:715: Cannot allocate 
> memory
> Sep 24 19:38:52 aotearoa innfeed[24368]: Could not retrieve 
> @0301423130000000000000274D45000002CB@: mmap failed
> ----
> 

My guess for these has always been running out of virtual address
space (or fragmentation of it).

-- 
Alex Kiernan, Principal Engineer, Development, THUS plc