Date: Tue, 12 Feb 2008 09:20:57 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Dominic Fandrey <kamikaze@bsdforen.de> Cc: "Carlos A. M. dos Santos" <unixmania@gmail.com>, freebsd-stable@freebsd.org Subject: Re: RELENG_7: interrupt eating whole cpu core Message-ID: <1202808057.2126.45.camel@localhost> In-Reply-To: <47ACA0E4.2030905@bsdforen.de> References: <47A9F835.1060200@bsdforen.de> <47AA0696.5020109@bsdforen.de> <7872AB6E-21DA-4E2D-93C0-D07CFA3A7E47@mac.com> <47AA0E3E.4020304@bsdforen.de> <e71790db0802071822l661bdcb8s6dfe5b94be11f0dc@mail.gmail.com> <47ABF66E.4040807@bsdforen.de> <e71790db0802080543g54d27bb8nfdc33e342f982b4@mail.gmail.com> <1202485501.2126.34.camel@localhost> <47AC7FF6.1020801@bsdforen.de> <1202491071.2126.42.camel@localhost> <47ACA0E4.2030905@bsdforen.de>
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--=-N9GY/K+J4P+l5kaEyEn6 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2008-02-08 at 19:35 +0100, Dominic Fandrey wrote: > Tom Evans wrote: > > On Fri, 2008-02-08 at 17:14 +0100, Dominic Fandrey wrote: > >> Tom Evans wrote: > >>> If I try to turn on DMA, I just get WDMA2, which just doesn't cut it: > >> I think any DMA mode is fast enough to handle a DVD drive. There's jus= t no=20 > >> necessity for more. > >> > >=20 > > WDMA is not UDMA. Any UDMA variant would be enough. WDMA2 provides a > > maximum of 16MiB/s, which will frequently lead to buffer underruns > > viewing a DVD. UDMA2 provides a maximum of 33MiB/s, which IS plenty. >=20 > 16MB/s is exactly what is needed for 12x DVD access. I think this is the = usual=20 > speed for a Notebook drive nowadays and it suffices for me. >=20 > >>>> # atacontrol mode acd0 udma5 > >>> current mode =3D WDMA2 > >> Same as for me. I'm satisfied with the speed of the drive. > >=20 > > I'm rarely satisfied - I'm quite often not bothered enough to pursue :) >=20 > Well, if 12x speed is not enough for you, you have to use an external dri= ve.=20 > This is not a driver issue. It's just what your drive supports. The chipset supports UDMA6, the drive supports UDMA6, I should be happy with WDMA2 because 'thats what works'? Thanks for your 'help'. I'll continue on here from myself. --=-N9GY/K+J4P+l5kaEyEn6 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBHsWTzlcRvFfyds/cRAh/1AJ9y8rBVXDGlscE/RYl9leKaRTlH2gCfRify IB8efrA5J0jbLamTIuMyhms= =/+WT -----END PGP SIGNATURE----- --=-N9GY/K+J4P+l5kaEyEn6--
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