Date: Mon, 7 Jun 2004 17:37:59 +0800 (CST) From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw> To: freebsd-current@freebsd.org Subject: if_em locked up under high network load in -CURRENT Message-ID: <040607172005C.88581@www.mmlab.cse.yzu.edu.tw>
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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 For complete dmesg of this Thinkpad T40, please consult: http://www.mmlab.cse.yzu.edu.tw/~avatar/dmesg-noacpi.txt http://www.mmlab.cse.yzu.edu.tw/~avatar/dmesg-acpi.txt (the reason why em0 was detached and re-attached twice is that I've tried to see whether kldunload/kldload if_em again can workaround this problem without rebooting.)
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