The values looks reasonable, garbage collection start (gc_thresh:32768)
fairly early, but I often see that the GC cannot keep up.
The maximum size of the route cache max_size=524288 is okay, but it
depends on the usage pattern. On my production systems I has increased
max_size to 2 million, to keep up!
Another interesting value is secret_interval:600, which is the interval
the route cache is flushed, in seconds, that is 10 minuts.
524288/600 = 873 packet/sec to new destinations.
You should realize that filling the route cache in 10 minuts can happen,
as it only requires 873 packet/sec to new destinations.
What to do next:
Monitor the route cache, to see whats actually happening. The route cache
counters are located in /proc/net/stat/rt_cache, but is not very human
readable. Use the tool "rtstat" to monitor the route cache.
The rtstat tool can be downloaded from Roberts site:
ftp://robur.slu.se/pub/Linux/net-development/rt_cache_stat
Cheers,
Jesper Brouer
--
-------------------------------------------------------------------
MSc. Master of Computer Science
Dept. of Computer Science, University of Copenhagen
Author of http://www.adsl-optimizer.dk
-------------------------------------------------------------------
On Wed, 10 Jan 2007, ArcosCom Linux User wrote:
Here are:
# grep . /proc/sys/net/ipv4/route/*
/proc/sys/net/ipv4/route/error_burst:5000
/proc/sys/net/ipv4/route/error_cost:1000
grep: /proc/sys/net/ipv4/route/flush: Operación no permitida
/proc/sys/net/ipv4/route/gc_elasticity:8
/proc/sys/net/ipv4/route/gc_interval:60
/proc/sys/net/ipv4/route/gc_min_interval:0
/proc/sys/net/ipv4/route/gc_min_interval_ms:500
/proc/sys/net/ipv4/route/gc_thresh:32768
/proc/sys/net/ipv4/route/gc_timeout:300
/proc/sys/net/ipv4/route/max_delay:10
/proc/sys/net/ipv4/route/max_size:524288
/proc/sys/net/ipv4/route/min_adv_mss:256
/proc/sys/net/ipv4/route/min_delay:2
/proc/sys/net/ipv4/route/min_pmtu:552
/proc/sys/net/ipv4/route/mtu_expires:600
/proc/sys/net/ipv4/route/redirect_load:20
/proc/sys/net/ipv4/route/redirect_number:9
/proc/sys/net/ipv4/route/redirect_silence:20480
/proc/sys/net/ipv4/route/secret_interval:600
El Mie, 10 de Enero de 2007, 16:01, Jesper Dangaard Brouer escribió:
On Wed, 10 Jan 2007, ArcosCom Linux User wrote:
El Mie, 10 de Enero de 2007, 8:15, Patrick McHardy escribió:
ArcosCom Linux User wrote:
The log says:
Dec 30 00:52:27 cura kernel: dst cache overflow
The log message "dst cache overflow" is normally related to overflow of
the route cache. The max_size of the route cache can be adjusted through
/proc/sys/net/ipv4/route/max_size.
What is your settings in /proc/sys/net/ipv4/route/?
Run command:
grep . /proc/sys/net/ipv4/route/*
Hilsen
Jesper Brouer
--
-------------------------------------------------------------------
MSc. Master of Computer Science
Dept. of Computer Science, University of Copenhagen
Author of http://www.adsl-optimizer.dk
-------------------------------------------------------------------
_______________________________________________
LARTC mailing list
LARTC@xxxxxxxxxxxxxxx
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
