Date: Sat, 17 Jul 2010 22:21:28 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: freebsd-current@freebsd.org, Rui Paulo <rpaulo@freebsd.org> Subject: Re: Why is intr taking up so much cpu? Message-ID: <20100717192128.GM2381@deviant.kiev.zoral.com.ua> In-Reply-To: <alpine.BSF.2.00.1007171208010.1538@qbhto.arg> References: <alpine.BSF.2.00.1007170013191.7378@qbhto.arg> <A81B337F-5932-44B1-BDB4-D9DD36332A16@lavabit.com> <alpine.BSF.2.00.1007171103060.1546@qbhto.arg> <F653FF83-D9CF-42A2-AE9A-B8F914090065@FreeBSD.org> <alpine.BSF.2.00.1007171208010.1538@qbhto.arg>
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--Jaerp9zHWz52Eeko Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jul 17, 2010 at 12:10:26PM -0700, Doug Barton wrote: > On Sat, 17 Jul 2010, Rui Paulo wrote: >=20 > >This doesn't indicate any problem. I suggest you try to figure out what= =20 > >interrupt is causing this by adding printfs or disabling drivers one by= =20 > >one. >=20 > I've no idea where to even begin on something like that. Given that=20 > there are other -current users who are also having problems=20 > (particularly with the nvidia drivers) I'm wondering if some sort of=20 > systemic debugging isn't in order here? >=20 Note that intr time most likely come from the interrupt threads chewing the CPU, not from the real interrupt handlers doing something, and definite= ly not due to the high interrupt rate, as your vmstat -i output already shown. Run top in the mode where all system threads are shown separately (e.g. top -HS seems to do it), then watch what thread eats the processor. --Jaerp9zHWz52Eeko Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkxCArgACgkQC3+MBN1Mb4i/6wCfQ1RzUrMRGCNqHJrzYjD+cdu9 hMUAoJPUz/3Y17X8GDufNYEMJSBmEAQL =GvvQ -----END PGP SIGNATURE----- --Jaerp9zHWz52Eeko--
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