Date: Fri, 25 Nov 2005 04:47:57 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: freebsd-questions@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: so much clock interrupts?! Message-ID: <20051125094757.GA39944@xor.obsecurity.org> In-Reply-To: <20051125064503.GA707@bsd.trippelsdorf.de> References: <20051124013438.T8326@chylonia.3miasto.net> <slrndoarjo.2d8m.Markus@bsd.trippelsdorf.de> <20051124204359.GD30073@xor.obsecurity.org> <20051125064503.GA707@bsd.trippelsdorf.de>
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--KsGdsel6WgEHnImy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 25, 2005 at 07:45:03AM +0100, Markus Trippelsdorf wrote: > On Thu, Nov 24, 2005 at 03:43:59PM -0500, Kris Kennaway wrote: > > On Thu, Nov 24, 2005 at 07:40:40AM +0000, Markus Trippelsdorf wrote: > > > On 2005-11-24, Wojciech Puchar <wojtek@tensor.3miasto.net> wrote: > > > > that's what i see in systat with FreeBSD 6.0/i386-SMP > > > > > > > > > > > > 540 534 99 pdwak 2= 000 cpu0: time > > > > 16825 pdpgs 2= 000 cpu1: time > > > > > > > > > > > > on FreeBSD 5.3 live CD i have 100 not 2000 times per second > > > > > > > > isn't it too much?! > > >=20 > > > Yes it is. > > > That's why I have kern.hz=3D"100" in my /boot/loader.conf . > >=20 > > Have you been able to measure a performance benefit from reducing it? > > Have you shown that reducing it does not cause your performance to > > *drop*? It was increased for a reason..it actually increases > > performance on some workloads. > >=20 > Yes, I guess it increases performance on a high throughput webserver or > router that uses polling.=20 > But on the Desktop it only increases the overhead without any benefits > at all. 2000 interrupts per second per core for the timer is a=20 > ridiculous high number and I reduce it simply for aesthetic reasons. > This may be a religious issue and everyone should use what he or she > seems fitting. You should do what makes you feel happy, of course :) Kris --KsGdsel6WgEHnImy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDht3NWry0BWjoQKURAquuAKC3p6d9X3KP4LeCpWtzEVd2scdVGwCeLOkB pHtPiimQZBjoEy3v3wVhOVs= =oQmW -----END PGP SIGNATURE----- --KsGdsel6WgEHnImy--
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