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

[Sepherosa Ziehau via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2534 has been updated by sepherosa.


On Wed, Mar 27, 2013 at 3:42 PM, Francois Tigeot via Redmine
<bugtracker-admin@leaf.dragonflybsd.org> wrote:
>
> Issue #2534 has been reported by ftigeot.
>
> ----------------------------------------
> Bug #2534: Network connections freeze with heavy email traffic
> http://bugs.dragonflybsd.org/issues/2534
>
> Author: ftigeot
> Status: New
> 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

I suggest to test the latest master, many network bugs are fixed since
the kernel version that crashed.

Best Regards,
sephe

--
Tomorrow Will Never Die
----------------------------------------
Bug #2534: Network connections freeze with heavy email traffic
http://bugs.dragonflybsd.org/issues/2534

Author: ftigeot
Status: New
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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