Re: if_em locked up under high network load in -CURRENT

From: Tai-hwa Liang <avatar_at_mmlab.cse.yzu.edu.tw>
Date: Thu, 24 Jun 2004 21:37:41 +0800 (CST)
It looks like that my T40 no longer get into such lockup in recent -CURRENT
(cvsup'ed on Jun-19-2004). Thanks for the great work!

On Mon, 7 Jun 2004, Tai-hwa Liang wrote:
> Greetings,
>
>   It seems that recent kernel changes breaks the em driver when the network
> load is high enough(rsync a directory contains +150MB files). The onboard
> Intel PRO/1000 just doesn't respond to network request such like ping or DHCP
> lease renewal -- all interrupt related to em0 was stopped since the lockup
> took place. However, the system is still workable(can compile/edit code, only
> em0 hangs) at this moment. Manually unload/reload the if_em kernel module
> doesn't solve this problem.
>
>   Last known good kernel was cvsup'ed on Apr-28-2004, the problem occurred
> since May-09-2004(cvsup/kernel build on a weekly basis, not sure about
> whether it worked between Apr-28 and May-09 or not).
>
>   Since booting w/o ACPI support solved this problem, I'm wondering
> about whether recent PCI/ACPI changes correlated to this lockup.
> The module was built without polling support; however, the lockup always
> happens disregarding device polling support is compiled in or not.
>
> ---------------------- vmstat -i ----------------------------
> interrupt                          total       rate
> irq0: clk                          93968         99
> irq1: atkbd0                        4227          4
> irq4: cbb0 em0++                  166447        176
> irq6: cbb1 pcm0                   133702         41
> irq7: ppc0                             1          0
> irq8: rtc                         120281        127
> irq9: acpi0                          301          0
> irq10: uhci1                         200          0
> irq11: ath0 uhci2+                     2          0
> irq12: psm0                           21          0
> irq13: npx0                            1          0
> irq14: ata0                         7425          7
> irq15: ata1                           55          0
> Total                             392929        417
[...]
Received on Thu Jun 24 2004 - 11:37:59 UTC

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