kern/121962: Kernel panics with device polling and snd_emu10k1.ko enabled and network load

[Volker]

The following reply was made to PR kern/121962; it has been noted by GNATS.

From: Volker <volker at vwsoft.com>
To: Dmitry Demidov <dima_bsd at inbox.lv>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: kern/121962: Kernel panics with device polling and  snd_emu10k1.ko
 enabled and network load
Date: Sun, 25 May 2008 22:12:38 +0200

 Dmitry,
 
 On 05/25/08 09:58, Dmitry Demidov wrote:
 >> Dmitry,
 >>
 >> I've just seen, you've enabled DEVICE_POLLING in kernel config. Can you
 >> please try to remove that option and instead use `ifconfig em0 polling'?
 >>
 >> The use of 'option DEVICE_POLLING' is deprecated.
 
 ouch... did I really write something that stupid? I took notice while
 reading your reply.
 
 Of course, you need to have DEVICE_POLLING in kernel, but the use of
 sysctl kern.polling.enable is deprecated.
 
 > 
 > Sorry, it did not works at all. Then option DEVICE_POLLING is removed from the 
 > kernel, I'm unabled to start polling mode. 
 > 
 > # ifconfig em0
 > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
 > 	options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
 > 	ether 00:20:ed:11:11:11
 > 	inet 7.8.2.5 netmask 0xffffe000 broadcast 255.255.255.255
 > 	media: Ethernet autoselect (100baseTX <full-duplex>)
 > 	status: active
 > 
 > # ifconfig em0 polling
 > 
 > # ifconfig em0
 > em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
 > 	options=9b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM>
 > 	ether 00:20:ed:11:11:11
 > 	inet 7.8.2.5 netmask 0xffffe000 broadcast 255.255.255.255
 > 	media: Ethernet autoselect (100baseTX <full-duplex>)
 > 	status: active
 > 
 > # sysctl -a | grep pol
 > kern.dcons.poll_hz: 100
 > kern.sched.topology: 0
 > debug.acpi.ec.polled: 0
 > 
 
 Clearly because of my wrong hint. Please try the following:
 
 include DEVICE_POLLING in your kernel config
 make sure, you don't use kern.polling.enable
 enable polling for your em0 device by using `ifconfig em0 polling'.
 
 Can you please try that?
 
 Sorry for my misinformation. Working on too much things in parallel.
 
 Volker