running out of mbufs?

[Dave+Seddon]

So as for the system losing all network connectivity, do you have any 
suggestions? 

regards,
Dave 


Kris Kennaway writes: 

> On Wed, Aug 03, 2005 at 01:49:32PM +1000, Dave+Seddon wrote:
>> Greetings, 
>> 
>> I'm trying to do some performance testing of a content filtering system, so
>> I'm trying to get very high HTTP throughput.  I've got 4 * HP DL380s with
>> 3.4G Xeon processors (hyper threading) and 1 G RAM, 2 onboard BGEs, and 2 *
>> 2 port EM.  Using FreeBSD5.4-stable (as of 2005/08/02) and device polling,
>> I've configured a large number (246) VLAN interfaces on two machines, and
>> have apache on one box and siege on the other.  Using 'siege -f
>> /home/my_big_list_of_urls -c 50 --internet' one host does a large number of
>> request from the other machine.  I've been trying to tune for maximum
>> performance and have been using lots of examples for /etc/sysctl.conf and so
>> on from the web.  Adjusting these settings and running the siege, I've found
>> the apache server completely loses network connectivity when device polling
>> is enabled.  I've adjusted the HZ lots and found the system survives the
>> longest set a 15000 (yes it seems very large doesn't it).  The problem now
>> seems to be that I'm running out of mbufs: 
>> 
>> --------------------------------------
>> 4294264419 mbufs in use
>> 4294866740/2147483647 mbuf clusters in use (current/max)
> 
> This is a FAQ..see the release errata.  The short answer is that it's
> not a real leak, only a leak in the stats.  This is fixed in 7.0 and
> might be fixed in 6.0-RELEASE. 
> 
> Kris
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