[DragonFlyBSD - Bug #2534] (Resolved) Network connections freeze with heavy email traffic

[Francois Tigeot via Redmine]

Issue #2534 has been updated by ftigeot.

Status changed from New to Resolved
% Done changed from 0 to 100

The issue seems to be resolved indeed, I couldn't reproduce it with today's kernel.
The current number of mbuf clusters in use doesn't grow bigger than the maximum limit anymore.

Thanks for the tip!
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Bug #2534: Network connections freeze with heavy email traffic
http://bugs.dragonflybsd.org/issues/2534

Author: ftigeot
Status: Resolved
Priority: Normal
Assignee: 
Category: 
Target version: 


When under heavy load (receiving a stream of mails at 1Gb/s from a LAN machine), network connections freeze on a mail relay machine.
This machine is also a PPP/ADSL router.

The console shows this message:
    Warning, objcache(cluster mbuf): Exhausted!

netstat -m output:
    5306/4480 mbuf clusters in use (current/max)

Some processes (most often ppp and sendmail) end up in a weird state, as shown by these top outputs:

  PID USERNAME   NICE  SIZE    RES    STATE CPU  TIME   CTIME    CPU COMMAND
 1879 root         0    14M  2864K     CPU0  0   0:00    0:00  0.34% top
  260 root         0    24M  2476K  tunread  2   0:05    0:05  0.00% ppp

  PID USERNAME   NICE  SIZE    RES    STATE CPU  TIME   CTIME    CPU COMMAND
82699 ftigeot      0    15M  2872K     CPU3  3   0:00    0:00  0.39% top
  265 root         0    25M  1172K objcache  1 154:06  154:06  0.00% ppp

Only a reboot allows the machine to resume network operations.


A core dump is available in leaf:~ftigeot/crash/crash.objcache




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