misc/153308: em interface use 100% cpu

[Yusuf Ozbilgin]

>Number:         153308
>Category:       misc
>Synopsis:       em interface use 100% cpu
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 20 14:30:11 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Yusuf Ozbilgin
>Release:        Freebsd 7.3
>Organization:
Gunes Bilg. A.S
>Environment:
FreeBSD firewall.test.local 7.3-RELEASE-p2 FreeBSD 7.3-RELEASE-p2 #0: Wed Sep 22 17:41:32 EEST 2010     root at firewall.test.local:/usr/obj/usr/src/sys/GATEWAY-FW  i386
>Description:
After installing freebsd as a gateway, natd use 100% cpu without any network load, I am using em interfaces. I updated kernel and recompiled but nothing changed.



em0 at pci0:1:0:0: class=0x020000 card=0x00008086 chip=0x10d38086 rev=0x00 hdr=0x00
    vendor     = 'Intel Corporation'
    class      = network
    subclass   = ethernet
    cap 01[c8] = powerspec 2  supports D0 D3  current D0
    cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
    cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
    cap 11[a0] = MSI-X supports 5 messages in map 0x1c

top

  PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
 1592 root          1 112    0  3348K  1316K RUN     0   0:38 85.09% natd
 1899 postfix       1   4    0 24600K 21336K kqread  0   0:06  0.00% qmgr
 1762 root          1  44    0 39132K 36772K select  0   0:03  0.00% perl



>How-To-Repeat:
Always
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: