Date: Fri, 20 Apr 2012 14:18:29 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: FreeBSD Hackers <freebsd-hackers@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Disabling an arbitrary device Message-ID: <CACqU3MXrORmEvdQsudG9sJvX2sj2=haZQ2QNxz%2Btfys4PsxA-Q@mail.gmail.com> In-Reply-To: <CACqU3MWa%2BMxR_uHcOYd4qPFsPLV0acOhTAPLU6whBjw6N_muxg@mail.gmail.com> References: <CACqU3MWa%2BMxR_uHcOYd4qPFsPLV0acOhTAPLU6whBjw6N_muxg@mail.gmail.com>
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Hi, On Fri, Apr 20, 2012 at 2:16 PM, Arnaud Lacombe <lacombar@gmail.com> wrote: > Hi, > > I will be bringing up an old thread there, but it would seem the > situation did not evolve in the past 9 years. I have a machine running > 7.1 whose UHCI controller is generating some interrupt storm: > > # vmstat -i > interrupt total rate > irq4: sio0 1328 2 > irq19: uhci1+ 63514509 96380 > [...] > > generating useless load on one CPU: > > # top -SH > last pid: 5223; load averages: 0.00, 0.00, 0.00 up 0+00:17:21 13:10:35 > 117 processes: 14 running, 79 sleeping, 24 waiting > CPU: 0.2% user, 0.0% nice, 0.2% system, 6.6% interrupt, 93.0% idle > Mem: 33M Active, 9348K Inact, 67M Wired, 400K Cache, 29M Buf, 2892M Free > [...] > 57 root -64 - 0K 8K CPU0 0 11:59 86.57% irq19: uhci1+ > > I thought I could use an hint to forbid uhci(4) attachment, ala: > > hint.uhci.0.disabled="1" > hint.uhci.1.disabled="1" > > in /boot/loader.conf. However, it would seem that what should be > usable with any arbitrary devices, ie. be an integral part of > device(9), has to be hardcoded in every driver, sad. > as for the usual "if you're not happy, please provide a patch": https://github.com/lacombar/freebsd/commit/30786d09b0cb441890cdc749ee5243238e81d2d8 regards, - Arnaud > - Arnaud > > ps: the original thread I found is from September 2004: > http://lists.freebsd.org/pipermail/freebsd-questions/2004-September/058717.html
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