On Friday 12 November 2004 08:49 am, Michal Mertl wrote: > Alext Wilkinson wrote: > > Hi all, > > > > How does one stop an interrupt storm in RELENG_5 ? > > > >> >From top(1) > > > > CPU states: 10.9% user, 0.0% nice, 3.9% system, 85.3% interrupt, 0.0% > > idle > > > > >From vmstat(1) > > > > total rate > > ----- ---- > > irq18: uhci2 bt0++ 9187313 426 > > Answer to your question might be to modify sysctl hw.intr_storm_threshold. > > I can confirm, there is a problem in bktr(4) generating interrupt storms. > For several months I was seeing messages about interrupt storms and system > run fine (I haven't been using bktr for long time so I didn't care). I > tried to roll the bktr sources as far back as possible (that is to the time > before phk changed dev_t to struct cdev *) to no avail, so I suspect the > problem is caused by something outside of the driver. After latest changes > to interrupt throttling (rev. 1.117 of src/sys/kern_intr.c by jhb) the > system performance is pretty affected until I unload bktr driver because > bktr now seems to be doing some 120000 interrupts/second and not getting > throttled). This sounds like the bktr(4) driver doesn't properly program the device to turn off interrupts when it detaches if I've parsed this correctly. -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.orgReceived on Fri Nov 12 2004 - 19:30:40 UTC
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